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Abstract

Groundwater is a vital resource for domestic, agricultural, and industrial activities, as well as for ecosystem services. Despite this, the resource is under significant threat, due to increasing contamination from anthropogenic activities. Therefore, to ensure its reliability for present and future use, effective management of groundwater is important not only in terms of quantity (i.e. abstraction) but also quality. This can be achieved by identifying areas that are more vulnerable to contamination and by implementing protective measures. To identify the risk and delineate areas that are more exposed to pollution, various groundwater vulnerability assessment techniques have been developed across the globe. This paper presents an overview of some of the commonly used groundwater vulnerability assessment models in terms of their unique features and their application. Special emphasis is placed on statistical methods and overlay-index techniques. The assessment of the literature shows that statistical methods are limited in application to the assessment of groundwater vulnerability to pollution because they rely heavily on the availability of sufficient and quality data. However, in areas where extensive monitoring data are available, these methods estimate groundwater vulnerability more realistically in quantitative terms. Many works of research indicate that index-overlay methods are used extensively and frequently in groundwater vulnerability assessments. Due to the qualitative nature of these models, however, they are still subject to modification. This study offers an overview of a selection of relevant groundwater vulnerability assessment techniques under a specificset of hydro-climatic and hydrogeological conditions.
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Authors and Affiliations

Simeneh Shiferaw Moges
1
ORCID: ORCID
Megersa Olumana Dinka
1
ORCID: ORCID

  1. University of Johannesburg, Faculty of Engineering and the Built Environment, Department of Civil Engineering Sciences, PO Box 524, Auckland Park, 2006 Johannesburg, South Africa
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Abstract

Re-delimitation of rainfall regions plays an important role in determining the rainfall pattern of an area. This study aims to reconstruct the delimitation of rainfall regions for the western region of Peninsular Malaysia. This study involved only the collection of rainfall data at 133 stations from 1960 to 2010. These data were obtained from the Department of Irrigation and Drainage, Malaysia. The analysis methods applied include kriging, contouring and topology using a geographical information system. The results showed that the new delimitation of the western region has been formed with an area reduction of 10% compared to the original western region found by Dale. This is due to some areas in the western region have not received rainfall between 2540 and 2794 mm. The area that getting the rainfall between 2540 and 2794 mm is 46,413.6 km2, in contrast to the sized of Dale’s western region of 51,596.2 km2. The area that frequently getting rainfall of between 2540 and 2794 during 1960s to 2010 are Parit Buntar, Taiping, Kuala Kangsar, Ipoh, Teluk Intan, Tanjong Malim, Batang Kali, Cameron Highlands, Subang, Petaling Jaya, Klang, Kajang and Bangi. The new delimitation formed through this study can be used as a guide by the agencies that manage water resources in Perak, Selangor and Negeri Sembilan in planning a more efficient water supply system.
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Bibliography

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PRAVEEN B., TALUKDAR S., MAHATO S., MONDAL J., SHARMA P., ISLAM A. R. M. T., RAHMAN A. 2020. Analyzing trend and forecasting of rainfall changes in India using non-parametrical and machine learning approaches. Scientific Reports. Vol. 10(1) p. 1–21. DOI 10.1038/s41598-020-67228-7.
SHAHARUDDIN A., NOORAZUAN M.H. 2006. Analysing rain patterns and trend in Negeri Sembilan using the GIS Polygon Thiessen and Isohyet Contours methods. Geografia Malaysian Journal of Society & Space. Vol. 3(2) p. 1–12.
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WAN RUSLAN I. 1994. Pengantar hidrologi [Introduction of hydrology]. Kuala Lumpur. Dewan Bahasa dan Pustaka. ISBN 978-9-83-624434-5 pp. 159.
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Authors and Affiliations

Mohmadisa Hashim
1
ORCID: ORCID
Nasir Nayan
1
ORCID: ORCID
Zahid Mat Said
1
ORCID: ORCID
Dewi Liesnoor Setyowati
2
ORCID: ORCID
Yazid Saleh
1
ORCID: ORCID
Hanifah Mahat
1
ORCID: ORCID
See L. Koh
1

  1. Universiti Pendidikan Sultan Idris, Faculty of Human Sciences, Department of Geography and Environment, 35900, Tanjong Malim, Malaysia
  2. Universitas Negeri Semarang, Semarang City, Indonesia
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Abstract

The article reviews one of the important problems of water usage – operational management of irrigation. The article discusses a methodological approach to the estimation of economic efficiency of water usage in the conditions of climate change in the territory concerned. So far, there has not been a simple method to determine this indicator. When assessing climatic conditions, taking into account their influence on the productivity of agricultural crops, it is necessary to take into account meteorological factors that have a decisive influence on the development of agricultural crops and, accordingly, determine their yield. These include primarily heat and moisture. Moreover, it is necessary to take into account their possible negative influence on the development of plants, considering that for each crop a certain optimum regime of temperature and soil moisture is required in different phases of its growth. To assess climatic conditions taking into account the potential crop productivity, we can use the CPA formula. Calculations have shown a close relationship between the CPA and the yield of agricultural crops. Correlation coefficients of the obtained bonds vary from 0.85 to 0.98 depending on the culture and the territory.
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Bibliography

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Authors and Affiliations

Viktoriia Zaporozhchenko
1
ORCID: ORCID
Andrij Tkachuk
1
ORCID: ORCID
Tetyana Tkachuk
1
ORCID: ORCID
Viktor Dotsenko
1
ORCID: ORCID

  1. Dnipro State Agrarian and Economic University, Faculty of Water Management Engineering and Ecology, Serhiia Yefremova St, 25, Dnipro, Dnipropetrovs’ka oblast, 49600, Ukraine
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Abstract

In furrow irrigation, the maximum lateral movement of water in ridges is more desirable than the vertical downward movement. This can be achieved by compacting the furrows. Thus, the study examines the impact on furrow soil compaction by tractor wheel trafficking during mechanical operations in the different soil types. In this experiment, the three-wheel tractor compaction includes: 1) control (no soil compaction), 2) compaction through 3-wheel tractor passes, and 3) compaction through 6-wheel passes under three different soil textural classes such as: clay loam, silty clay loam and silty loam soils. The impact of various treatments on clay loam, silty clay loam, and silty loam under 3- and 6-wheel passes showed increased bulk density (7–12%), field capacity (9–19%), ridge storage efficiency (35–38%), water use efficiency (16–20.5%) and decreased soil porosity (7–16%), infiltration (8–20%), and furrow storage efficiency (28–41%) over the control. This study shows comparable results of 6-passes with other studies in which more than 6-passes were used to compact the soil. This study suggested that farmers can maximise water use efficiency by compacting their furrows using 6-passes tractor trafficking.
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Bibliography

AHMADI I., GHAUR H. 2015. Effects of soil moisture content and tractor wheeling intensity on traffic-induced soil compaction. Journal of Central European Agriculture. Vol. 16(4) p. 489–502. DOI 10.5513/JCEA01/16.4.1657.
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Authors and Affiliations

Rahim Bux Vistro
1
Mashooque Ali Talpur
1
Irfan Ahmed Shaikh
1
Munir Ahmed Mangrio
1

  1. Sindh Agriculture University, Faculty of Agricultural Engineering, Tandojam, Hyderabad, 70060, Sindh, Pakistan
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Abstract

The impact of wind power plants on the environmental components is assessed taking into account a number of their parameters, in particular the technical characteristics of wind turbines, the characteristics of networks, engineering and other structures. To do this the life cycle of the wind power plants is described taking into account (by way of inventory) all the necessary materials and resources. Waste management scenarios have been developed, the use of which will make it possible to reduce the harmful impact on the environment. Based on the inventory and input data on the wind farm under study, a diagram is generated – a tree of life cycle processes of the wind power plant – to determine the potential environmental impacts. A list of impact categories that represent the load on the environment caused by the wind power plant is defined; also, the relative contribution of harmful factors is determined for each category, taking into account possible scenarios of waste management. Ecological profiles have been built for all potential impacts on the environment. After normalisation and determination of significance, individual estimates of all indicators and their distribution in three categories of lesions were obtained: human health, ecosystem quality and resources, as well as four stages of the wind farm life cycle: production, dismantling and disposal, operation, transportation and installation. The obtained profiles made it possible to determine individual indicators and eco-indicators, expressed in eco-points that characterise the wind farm under study.
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Authors and Affiliations

Mariia Ruda
1
ORCID: ORCID
Taras Boyko
1
ORCID: ORCID
Oksana Chayka
1
ORCID: ORCID
Maryna Mikhalieva
2
ORCID: ORCID
Olena Holodovska
1
ORCID: ORCID

  1. Lviv Polytechnic National University, 12 Bandera Str., 79000, Lviv, Ukraine
  2. Hetman Petro Sahaidachnyi National Army Academy, Lviv, Ukraine
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Abstract

Climate change causes various events, such as El Niño , and we experience their larger frequency. This study based on a quantitative approach uses observation data from the Umbu Mehang Kunda Meteorological Station and the Ocean Niño Index ( ONI). As a result, East Sumba, which has an arid climate, has more challenges in dealing with drought and water deficits during El Niño. This study identifies rainfall when the El Niño phenomenon takes place in East Sumba through data contributing to the ONI value and dry day series from 1982 to 2019. The analysis was carried out by reviewing these data descriptively and supported by previous literature studies. The research found that there was a decrease in the accumulative total rainfall in El Niño years. The annual rainfall in the last six El Niño events is lower than the annual rainfall in the first six El Niño events. The dry day series is dominated by an extreme drought (>60 days) which generally occurs from July to October. This drought clearly has a major impact on livelihoods and causes difficulties in agriculture as well as access to freshwater. This results in crop failure, food shortages, and decreased income. The phenomenon triggers price inflation in the market and potential increase in poverty, hunger, and pushes the country further away from the first and second Sustainable Development Goals. This phenomenon and problems related to it need to be dealt with by multistakeholders.
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Authors and Affiliations

Mahawan Karuniasa
1
ORCID: ORCID
Priyaji Agung Pambudi
1

  1. University of Indonesia, School of Environmental Science, Salemba Raya Street No. 4, Central Jakarta, DKI Jakarta, 10430, Indonesia
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Abstract

In recent years, the technical and economic feasibility of using microalgae and cyanobacteria has been explored for the removal and exploitation of domestic, agricultural and industrial residual effluents with high C, N and P compounds content. To contribute to the understanding of the process and its technical viability for microalgae growth, the article discusses monitoring, flow determination, and physicochemical characteristics of two types of effluents generated in an experimental farm located in the east of Colombia, before (R1) and after biological treatment (R2). In general, the results showed the reduction of different parameters, such as total dissolved solids (TDS), hardness, salinity and phosphates after treatment with activated sludge. However, the conductivity value obtained in R1 and R2 showed the presence of a pollutant load. These findings can be attributed to the highest concentration of fats and oils in the water during early hours of the day. Finally, although the concentration of nitrates increased from 46.63 to 225.21 mg∙dm–3 and phosphate decreased slightly from 9.65 to 6.21 mg∙dm–3, no inhibition was generated in the microalgae, as evidenced in the growth of the microalgal biomass in effluents after nitrate and phosphate removal above 80%.
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Authors and Affiliations

Nestor Andres Urbina-Suarez
1
ORCID: ORCID
Andres Fernando Barajas-Solano
1
ORCID: ORCID
Janet Bibiana Garcia-Martinez
1
ORCID: ORCID
German Luciano Lopez-Barrera
1
ORCID: ORCID
Angel Dario González-Delgado
2
ORCID: ORCID

  1. Universidad Francisco de Paula Santander, Faculty of Agricultural and Environmental Sciences, San José de Cúcuta, Colombia
  2. University of Cartagena, Avenida del Consulado Calle 30 No. 48-152, Cartagena, Bolívar, 130001, Colombia
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Abstract

This article is a continuation of the topic of artificial water bodies in Ukraine, which was started in our previous publication in 2020. It was devoted to accounting and monitoring of ponds at the local and national levels. Reservoirs play important role in water supply for various sectors of the economy. For this reason, much more attention is paid to reservoirs by the State Agency of Water Resources of Ukraine (Ukr. Derzhavne ahentstvo vodnykh resursiv Ukrainy), the Ministry of Ecology and Natural Resources of Ukraine (Ukr. Ministerstvo ekolohii ta pryrodnykh resursiv Ukrainy), scientists and specialists. The main tasks of the article are: to establish patterns of territorial distribution of reservoirs in administrative regions and river basins districts; to identify the role of large and small reservoirs in the balance of river runoff regulation. There are 1054 reservoirs in Ukraine, so it can be considered a country rich in reservoirs. The volume of the cascade of six reservoirs on the Dnieper River and the Dniester Reservoir is 85%, other reservoirs – 15% of the total number. At the same time, there are 1047 other reservoirs (middle, small and very small), which provide for regional needs and which have their own patterns of distribution throughout the country. The main trend in their creation was water supply of industrial regions, in particular Kharkiv, Donetsk, Dnipropetrovsk and others. About 28% of reservoirs are leased. These reservoirs also require clear accounting and monitoring at the national level, attention from water management and environmental organizations.
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Authors and Affiliations

Valentyn Khilchevskyi
1
ORCID: ORCID
Vasyl Grebin
1
ORCID: ORCID
Sergiy Dubniak
2
ORCID: ORCID
Myroslava Zabokrytska
3
ORCID: ORCID
Hanna Bolbot
4
ORCID: ORCID

  1. Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Street, Kyiv, 01601, Ukraine
  2. Institute of Hydrobiology National Academy of Sciences of Ukraine, Kyiv, Ukraine
  3. Lesya Ukrainka Eastern European National University, Lutsk, Ukraine
  4. Ukrainian Hydrometeorological Institute, Kyiv, Ukraine
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Abstract

Identification and ecological diagnostics of the influence of basic load parameters (the cumulative effect of air temperature, the amount of precipitation) is a fundamental aspect of the wastewater sludge treatment at drying beds. The positive dynamics of atmospheric precipitation and the long-term functioning of natural and technical systems for wastewater sludge treatment under the influence of excessive atmospheric moisture does not allow the treatment/drying of precipitation, which provokes soil pollution with subsequent diffusion of pollutants into groundwater, which leads to the degradation of the natural environment components interacting with drying beds. The article is devoted to the adaptation of the process of treatment/drying of wastewater sludge at drying beds. The method includes identification of the dynamics of climatic factors of a long-term chronological series, which makes it possible to predict the effect of atmospheric precipitation on the wastewater sludge drying. The costs for the implementation and subsequent use of the proposed method are absent or insignificant (in the conditions of an increase in usable area during the modernisation of existing drying beds) in comparison with the costs of well-known and widespread methods of deliquefaction.
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Authors and Affiliations

Andrei Mikhailovich Dregulo
1 2
ORCID: ORCID

  1. National Research University “Higher School of Economics”, Pechatnikov str. 16, 198099 Saint-Petersburg, Russia
  2. Saint-Petersburg Federal Research Center of the Russian Academy of Sciences (SPC RAS), Scientific Research Centre for Ecological Safety of the Russian Academy of Sciences, Korpusnaya str. 18, 197110, Saint-Petersburg, Russia
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Abstract

The main purpose of this study is to determine the optimum water consumption for achieving water savings and obtaining good yields in cotton production, which has been expanding in Central Asia and Turkmenistan since the 1960s. In the last few decades, water resources in the region have been difficult to access, due to the expansion of agricultural activity and population growth. The oscillation of the amount of water released from dams of the Amudarya River to obtain energy for the upper countries in the winter season has been causing crises in countries of Central Asia.
An experiment was carried out in an agricultural field at a cotton research centre in the Yolöten district of Turkmenistan. The experiment led to the observation that it is possible to achieve higher efficiency and lower water consumption in cotton production. At the same time, the water savings that can be achieved as a result of using the drip irrigation method in cotton production throughout the country have been calculated. The calculations have provided the basis for recommending irrigation as a solution to the problems in question.
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Authors and Affiliations

Begmyrat Kulmedov
1
ORCID: ORCID
Vladimir I. Shcherbakov
2
ORCID: ORCID

  1. Nile University of Nigeria, Department of Civil Engineering, Plot 681, Cadastral Zone C-OO, Research & Institution Area, Jabi Airport Bypass, Abuja FCT, 900001, Nigeria
  2. Voronezh State Technical University, Department of Hydraulics, Water Supply and Water Disposal, Voronezh, Russia
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Abstract

The construction of the Keuliling Reservoir aims to accommodate and utilise water for agricultural purposes. In this research, soil erosion modelling using the USLE method showed that the level of erosion hazard for each Keuliling Reservoir sub-watershed was classified into low-moderate. Land erosion occurred in the area around the reservoir inundation is the most significant contribution to the magnitude of erosion (38.62 Mg∙ha–1∙y–1. Based on the point of sediment sampling in the Keuliling reservoir, the sediment volume was 1.43 Mg∙m–3. So, the volumetric sediment input from the Keuliling reservoir watershed is 20.918,32 m3∙y–1. The degradation of reservoir function due to sedimentation can affect reservoir services. The ability to estimate the rate of watershed surface erosion and sediment deposition in the reservoir is vital for reservoir sustainability. Besides the land erosion in the Keuliling Reservoir, there are also other potential sources of erosion that can reduce the capacity of the reservoir, i.e. the rate of sedimentation from a reservoir cliff landslide. The USLE estimation results show that the soil erosion analysis provides important and systematic information about nature, intensity and spatial distribution in the watershed and sediment volume in the Keuliling Reservoir. This finding allows the identification of the most vulnerable areas and the type of erosion dominant for long-term land management.
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Authors and Affiliations

Azmeri Azmeri
1
ORCID: ORCID
Nurbaiti Nurbaiti
2
Nurul Mawaddah
1
Halida Yunita
1
ORCID: ORCID
Faris Zahran Jemi
3
ORCID: ORCID
Devi Sundary
1
ORCID: ORCID

  1. Universitas Syiah Kuala, Engineering Faculty, Civil Engineering Department, Syech Abdur-Rauf No. 7 Darussalam, 23111, Banda Aceh, Indonesia
  2. Ministry of Public Works and Housing (PUPR) BWS Sumatera-I, Indonesia
  3. Universitas Syiah Kuala, Engineering Faculty, Electrical Engineering Department, Banda Aceh, Indonesia
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Abstract

To reduce the sediment transport capacity, shear stress needs to be reduced as well. The article describes work that has been done to find a way to make these reductions possible. The theoretical study and the approach proposed allowed us to obtain a general equation that determines conditions and calculates the most important parameters which support the reduction of shear stress. This describes the mechanism that erodes soils by free surface water flow.
In a similar vein, we have shown that adding a short non-prismatic channel to the entrance of a prismatic channel, which has the same geometric shape, is a very powerful way to reduce shear stress. With the idea of reducing shear stress, we have shown that the water-surface profile type plays a key role and must therefore be included in future reflections on reducing the importance of shear stress.
Additionally, the notion of efficiency was introduced that allows to evaluate the expected gain after the reduction of shear stress and adding a short non-prismatic channel.
The laws of similarity applied to free surface flows allowed us to obtain an equation with several equivalence scales and compare different geometric shapes in terms of their efficiency in the reduction of shear stress.
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Authors and Affiliations

Samir Haddad
1 2
ORCID: ORCID

  1. Houari Boumediène University of Sciences and Technology, Faculty of Civil Engineering. LEGHYD Laboratory, BP 32 Bab Ezzouar, 16111 Algiers, Algeria
  2. Akli Mohand Oulhadj University of Bouira, Rue Frères Boussendalah, 10000 Bouira, Algeria
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Abstract

Ukraine is characterised by active natural hazards processes within different structural, tectonic and landscape zones. In Middle Dnieper basin region mass movement processes have great impact on people’s livelihoods and infrastructure. These processes occur on the slopes with different geological structure. The determining causes include lithologic and stratigraphic conditions, hydrogeological regime, structural and textural peculiarities of rocks and the geomorphology of the slopes. Landslide inventory database has been developed based on long-term observations of more than 400 landslides and landslide-prone areas. This paper takes efforts forward by combining different geological and geophysical methods to advance the current understanding of landslide phenomena and contributing towards a better informed assessment of landslide hazard and risk. The developed methodology is implemented in a test sites of Kyiv region, covering an area of 18.3 km2 situated in the Middle Dnieper basin. Electrical Resistivity Tomography, Self-Potential and Infrared Thermography techniques were employed to investigate the lithostratigraphic sequences, the geometry of landslide body and potential mass movement. The results presented here confirm the potential of using an integrated approach that combines different field data to better plan mitigation activities and measures for the effective land management. This study will be useful in increasing the safety aspects of the infrastructures and lives and also for planning of research and developmental activities.
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Authors and Affiliations

Olena Ivanik
1
ORCID: ORCID
Joana Fonseca
2
ORCID: ORCID
Oleksandr Shabatura
1
ORCID: ORCID
Ruslan Khomenko
1
ORCID: ORCID
Kateryna Hadiatska
1
ORCID: ORCID
Dmytro Kravchenko
1
ORCID: ORCID

  1. Taras Shevchenko National University of Kyiv, Institute of Geology, 60, Volodymyrska str., Kyiv, 03001, Ukraine
  2. City, University of London, School of Mathematics, Computer Science and Engineering, Department of Civil Engineering, London, United Kingdom
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Abstract

The aquifer system of the Remila plain (Khenchela, Algeria), covering 250 km2, is one of the semiarid regions where groundwater is heavily exploited for urban supply and irrigation. An integrated hydrochemical and statistical analysis was performed on 70 water samples to identify the main processes and the origin of salinisation of our waters. Chemical analyses indicate salinity values (TDS) ranging from 568 to 1586 mg·dm–3 with an average of 869 mg·dm–3, with sulphate being the dominant ions, especially in the north and northeastern parts of the region. The identified chemical facies are SO4-Cl-Ca in the northeastern part, SO4-Cl-Ca-Mg present in most waters, and HCO3- Ca-Mg in the southeastern part.
We applied the statistical approach to group the waters into three categories using Principal Component Analysis (PCA) and Hierarchical Clustering Analysis (HCA); 1) saline waters (23%) (TDS > 1000 mg·dm–3 and SO42– dominance), 2) moderately saline waters (51%) with HCO3– dominance, 3) moderately saline waters (26%) with a mixed facies. The binary ion diagrams used suggest that the main hydrochemical processes are: evaporites dissolution and/or precipitation, accompanied by an exchange and/or reverse exchange of ions. Additionally, another process was detected in the northeastern part of the area; the saline intrusion of Sabkha waters, favoured by intensive aquifer exploitation.
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Authors and Affiliations

Laiche Aouidane
1
Mohamed Belhamra
2
Asma Kheddouma
3

  1. University of Abbes Laghrour Khenchela, Faculty of Nature and Life Sciences, Department of Agricultural Sciences, Route de Batna; Boîte Postale 1252 Khenchela, 40004 Khenchela, Algeria
  2. University of Mohamed Khider, Department of Agricultural Sciences, Biskra, Algeria
  3. University of Abbes Laghrour Khenchela, Faculty of Nature and Life Sciences, Department of Biology, Algeria
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Abstract

Groundwater is a very important natural resource to support the activities of the residents of Pakis District, Malang Regency. On the other hand, increased activity puts pressure on groundwater quality. Agricultural intensification, urbanisation, and industrialisation can be sources of pollutants. Hydrological factors, topography, lithology, and surrounding rainfall are triggers for contamination of groundwater. The main objective of this research is to determine the characteristics, quality of groundwater, and its susceptibility to pollution. To complete this research, geoelectric measurements were carried out at 43 points spread throughout the study area and sampling of 18 shallow wells in agricultural, residential, and industrial areas for chemical analysis. All data obtained were analysed to create a map of the spatial distribution of groundwater vulnerability. The results show that the groundwater in the study location is in the transition zone and flows through the volcanic rock layers. The level of groundwater pollution is in the uncontaminated status to heavily polluted with pollutants in the form of heavy metal manganese and Escherichia coli bacteria. The spatial distribution of groundwater intrinsic vulnerability shows low, moderate, and high levels of vulnerability, respectively 32.99%, 60.87%, and 6.14% of the research area. Groundwater specific vulnerability associated with land use factors shows that 26.25% are negligible, 42.46% are low, and 31.29% are moderate. From this it can be concluded that the study area has been polluted both geogenically and anthropogenically, therefore, special actions must be taken to restore the quality of groundwater.
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Authors and Affiliations

Prasetyo Rubiantoro
1
Mohammad Bisri
1
Aminudin Afandhi
1

  1. Universitas Brawijaya, Postgraduate Program, Jalan Veteran, Malang 65142, Indonesia
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Abstract

Soil erosion is an important factor that should be considered when planning renewable natural resource projects, effects of which can be measured by modelling techniques. Therefore, disintegration models determine soil loss intensity and support soil conservation practices. This study estimates soil loss rates by water erosion using the Erosion Potential Method (EPM) in the Kebir Rhumel Watershed located in Northeast Algeria. The area is north to south sub-humid to semi-arid, receives irregular rainfall, and has steep slopes and low vegetation cover which makes it very vulnerable to erosion. The main factors in the EPM (soil erodibility, soil protection, slope, temperature, and rainfall) were evaluated using the Geographical Information System (GIS) and data provided by remote sensing technologies. The erosion intensity coefficient Z was 0.60, which indicates medium erosion intensity. While the results showed the average annual soil erosion of 17.92 Mg∙ha–1∙y–1, maximum and minimum losses are 190.50 Mg∙ha–1∙y–1 and 0.21 Mg∙ha–1∙y–1, respectively. The EPM model shows satisfactory results compared to some studies done in the basin, where the obtained results can be used for more appropriate management of land and water resources, sustainable planning, and environmental protection.
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Authors and Affiliations

Amer Zeghmar
1
ORCID: ORCID
Nadir Marouf
1
ORCID: ORCID
Elhadj Mokhtari
2
ORCID: ORCID

  1. University of Larbi-Ben-M’hidi, Faculty of Sciences and Applied Sciences, Department of Hydraulic, Laboratory of Functional Ecology and Environment, Laboratory of Natural Resources and Management of Sensitive Environments, PO Box 358, 04000 Oum El Bouaghi, Algeria
  2. University Mohamed Boudiaf M’sila, Faculty of Technology, Department of Hydraulic, Algeria
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Abstract

This study tried to assess the impact of climate change on water resources of the upper Awash River sub- basin (Ethiopia) using a statistical downscaling model (SDSM). The future climatic parameters (rainfall, maximum and minimum temperatures) were generated by downscaling outputs of HadCM3 (Hadley Centre Coupled Model, ver-sion 3) general circulation model to watershed level for A2a (medium-high) and B2a (medium-low) emission scenarios at representative stations (Addis Ababa, Ginchi and Bishoftu). These SDSM generated climatic data were used to develop current/baseline period (1971–2010) and future climate change scenarios: 2020s (2011–2040), 2050s (2041– 2070) and 2080s (2071–2099). The projected future rainfall and mean monthly potential evapotranspiration at these stations were weighted and fed to HBV hydrological model (Hydrologiska Byråns Vattenbalansavdelning model) for future stream flow simulation. These simulated future daily flow time series were processed to monthly, seasonal and annual time scales and the values were compared with that of base period for impact assessment. The simulation result revealed the possibility for significant mean flow reductions in the future during Summer or “Kiremt” (main rainy season) and apparent increase during “Belg” or winter (dry season). Autumn flow volume showed decreasing trend (2020s), but demonstrated increasing trend at 2050s and 2080s. A mean annual flow reduction (ranging from 13.0 to 29.4%) is also expected in the future for the three studied benchmark periods under both emission scenarios. Generally, the result signals that the water resources of upper Awash River basin will be expected to be severely affected by the changing climate. Therefore, different adaptation options should be carried out in order to reduce the likely impact and ensure water security in the sub-basin.
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Authors and Affiliations

Eshetu Ararso Heyi
1
Megersa Olumana Dinka
2
ORCID: ORCID
Girma Mamo
3
ORCID: ORCID

  1. Oromia Agricultural Research Institute, Agricultural Engineering Research Directorate, Addis Ababa, Ethiopia
  2. University of Johannesburg, Faculty of Engineering and the Built Environment, Department of Civil Engineering Sciences, PO Box 524, Auckland Park, 2006 Johannesburg, South Africa
  3. Ethiopian Institute of Agricultural Research, Addis Ababa, Ethiopia
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Abstract

Drought is regarded as one of the environmental constraints threatening agriculture worldwide. Melatonin is a pleiotropic molecule prevalent in plants capable of promoting plant endogenous resilience to many environmental challenges including drought. Banana is an important staple food consumed in developing countries especially in Africa. In this research, we studied the role of melatonin in the growth of bananas subjected to drought under the Egyptian semi-arid conditions. To achieve this objective, a field experiment on banana (Musa spp., cv. Williams) mother plants and first ratoon was conducted on a private farm for two seasons - 2019 and 2020. Three irrigation treatments, 100, 90 and 80% irrigation water requirements (IWR) were used in conjunction with four concentrations of melatonin as a foliar spray (0 μmol, 40 μmol, 60 μmol, and 80 μmol) to determine the effect of both treatments on banana plant performance under drought. The results showed that there was a substantial difference between treatments, with the foliar application of melatonin at 80 μmol concentration improving most of the yield attributes, relative water content, total chlorophyll and proline with water deficit. However, the foliar application of the molecule lowered the biochemical characteristics mostly at 80% IWR under the Egyptian semi-arid conditions. Overall, there was a concentration-dependent response with regards to IWR for the two seasons 2019 and 2020.
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Authors and Affiliations

Islam F. Hassan
1
ORCID: ORCID
Maybelle S. Gaballah
1
ORCID: ORCID
Chukwuma C. Ogbaga
2
ORCID: ORCID
Soha A. Murad
3
ORCID: ORCID
Adam Brysiewicz
4
ORCID: ORCID
Basem M.M. Bakr
5
ORCID: ORCID
Amany Mira
6
ORCID: ORCID
Shamel M. Alam-Eldein
6
ORCID: ORCID

  1. National Research Centre (NRC), Agriculture and Biology Research Institute, Water Relations and Field Irrigation Department, Postal Code, 12622, 33 El Buhouth St, Dokki, Giza, Egypt
  2. Nile University of Nigeria, Department of Microbiology and Biotechnology, Abuja, Nigeria
  3. National Research Centre (NRC), Agriculture and Biology Research Institute Plant BioChemistry Department, Dokki, Giza, Egypt
  4. Institute of Technology and Life Sciences – National Research Institute, Falenty, Poland
  5. National Research Centre (NRC), Agriculture and Biology Research Institute, Pomology Department, Dokki, Giza, Egypt
  6. Tanta University, Faculty of Agriculture, Department of Horticulture, Tanta, Egypt
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Abstract

The subject of the study was to evaluate the stability and reliability of the sewage treatment plant in Nowy Sącz. The scope of the analysed indicators included the main indicators of wastewater contamination: BOD5 (biochemical oxygen demand), CODCr (chemical oxygen demand), total suspended solids (TSS), total nitrogen (Ntot), and total phosphorus (Ptot). The operation stability of the sewage treatment plant in Nowy Sącz was determined on the basis of control cards x for 24 observations made in the period 2018–2019 (2 years). Moreover, the technological reliability of the tested sewage treatment plant (WN) was determined based on the values of the analysed pollution indicators in treated sewage and their permissible values. On the basis of the conducted analyses, full stability of the removal process of most of the analysed contaminants was found. In no case was there any crossing of the control lines, only a single grouping of samples above the help line in the case of total nitrogen, which could indicate a periodical disturbance in the stability of the removal process of this compound. On the basis of the obtained values of the reliability coefficient, which were below WN = 1.00, reliable operation of the analysed facility was found, with a high degree of reduction (ƞ) of the analysed pollutants. The method of determining the technological reliability and stability of the treatment plant with the use of control cards is an effective and easy tool for detecting any disturbances and instabilities in the processes taking place in the tested facility. It enables the operator to take quick action to remove them, thus ensuring a safe wastewater treatment process for the environment and human health.
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Authors and Affiliations

Paulina Śliz
1
ORCID: ORCID
Piotr Bugajski
2
ORCID: ORCID

  1. Cracow University of Economics, Rakowicka 27, 31-510 Cracow, Poland
  2. University of Agriculture in Krakow, Department of Engineering Sanitary and Water Management, Cracow, Poland
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Abstract

The rainfall irregularity in the Al-Hoceima area places the Ghis-Nekor coastal aquifer as a primary resource for water supply. However, it is of paramount priority to adopt management and optimization plans that can mitigate the effects of the irrational use of the resource and the deterioration of its quality in the region of our study. In order to study the alteration aspects of this aquifer, 26 wells were sampled and their suitability for irrigation was assessed. The sodium adsorption rate (SAR) values indicate that most groundwater samples fall into the risk classes of high salinity and low sodium (C3-S1) and high salinity and medium sodium (C3-S2). The results also show a medium to high alkalinity risk due to the high concentration of HCO3–. The excess of salts is largely due to the intensive exploitation of groundwater and to the phenomenon of salt-water intrusion into the coastal karst aquifer. As a result, the quality of groundwater is not adapted to sustainable agricultural production and soil balance, which requires controlled monitoring to ensure its rational use with a view to the sustainable development of the region.
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Authors and Affiliations

Said Benyoussef
1 2
ORCID: ORCID
Mourad Arabi
3
ORCID: ORCID
Hossain El Ouarghi
2
ORCID: ORCID
Mohammad Ghalit
4
ORCID: ORCID
Yassine El Yousfi
2
ORCID: ORCID
Maryam Azirar
1
ORCID: ORCID
Ali Ait Boughrous
1
ORCID: ORCID

  1. University of Moulay Ismaïl, Faculty of Science and Technology Errachidia, Department of Biology, Research team: Biology, Environment and Health, Meknes, Morocco
  2. Abdelmalek Essaadi University, National School of Applied Sciences, Laboratory of Applied Sciences, Al Hoceima, Morocco
  3. Mohamed First University, Faculty of Sciences, Department of Biology, Laboratory of the Agricultural Production Improvement, Biotechnology, and Environment, P.B. 717, Oujda, Morocco
  4. Mohammed Premier University, Faculty of Science, Department of Chemistry, Laboratory of Mineral and Analytical Solid Chemistry, Oujda, Morocco
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Abstract

The control of water erosion is an important economic and societal challenge. Reduction of the agronomic potential of the parcels, muddy flows, siltation of dams are harmful consequences that mobilize farmers, water managers, local authorities and scientific researchers. This study focuses on mapping and quantifying seasonal soil losses in the territory of the former Nord-Pas-de- Calais administrative region, using the Revised Universal Soil Loss Equation (RUSLE) which incorporates five factors: rainfall erosivity, soil erodibility, topography, land use and erosion control practices. The seasonal (3-months) time scale is chosen to better account for the parameters governing the soil water erosion, especially rainfall and vegetation cover, that show great asynchronous intra-annual variability. Also, high resolution data concerning agricultural plots allows to evaluate which type of culture are the more subject to soil losses. In Nord-Pas-de-Calais, water erosion occurs almost ubiquitously, but the areas characterized by steep slopes are the most at risk (Artois Hills and Flanders), with loss rates up to 54 t∙ha–1∙y–1. The majority of erosion occurs during fall (46% of the computed annual losses of 1.69∙Mt), on plots left bare after harvest (especially corn and beets crops). The study also demonstrates that extending the intercrop technique over the region, and therefore maintaining a fall and winter cover, could reduce the soil losses by 37%.
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Authors and Affiliations

Wafae Nouaim
1
ORCID: ORCID
Dimitri Rambourg
2
ORCID: ORCID
Mohamed Merzouki
1
ORCID: ORCID
Abderrazak El Harti
1
ORCID: ORCID
Ismail Karaoui
1
ORCID: ORCID

  1. Faculty of Sciences and Techniques, Team of Remote Sensing and GIS Applied to Geosciences and Environment, University Sultan Moulay Slimane, Av Med V, BP 591 Beni-Mellal 23000, Maroc
  2. Institut Terre et Environnement de Strasbourg, University of Strasbourg/EOST/ENGEES, CNRS UMR 7063, Strasbourg Cedex, France
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Abstract

Water is becoming a scarce resource due to the immense intensification of agricultural activity, climate change, and demographic pressure. Hence, information on water use/management and their associated management practices is essential for selecting, planning, implementing, and monitoring schemes that optimise water use to meet the increasing demand related to basic human needs and welfare. This study presents the farmers’ perception of climate change from a gender sensitive perspective to promote adaptation and optimise irrigation/agricultural productivity in a compound surface-ground water system within the Anger sub-basin (Ethiopia). The study results showed that climate change affects water demand and supply routes in which more than 65% of the decrease in lake water level is due to climate change and overuse of surface water. The research findings show that women’s recognition and apprehension of climate change is much greater than men’s. Thus, women’s role in farming is important for ensuring food security at the household level. Gender sensitivity and can play a role in preventing the change in climate through optimising irrigation efficiency and suggesting the need for further research on its application to science. The study demonstrates that women’s participation in agricultural tasks, crisis management, and informal institutions is more vigorous than men’s.
On the other hand, the understanding and communication of farmers is based on experience and concerns about the climate impact. Moreover, studies showed that climate change has a potential impact on the access to water supply for agriculture, urbanisation, and the environment. Therefore, there is a need to assess the dynamics of surface- groundwater interaction as affected by climate change and gender inequality to optimise the irrigation system.
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Authors and Affiliations

Meseret Dawit
1
ORCID: ORCID
Megersa Olumana Dinka
2
ORCID: ORCID
Afera Halefom
3
ORCID: ORCID

  1. Haramaya University, Institute of Technology, Department of Water Resources and Irrigation Engineering, Haramaya University, P.O. Box 138, Dire Dawa, Ethiopia
  2. University of Johannesburg, Faculty of Engineering and the Built Environment, Department of Civil Engineering Sciences, Johannesburg, South Africa
  3. Debre Tabor University, Department of Hydraulic and Water Resources Engineering, Debre Tabor, Ethiopia
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Abstract

The objective of this research was to evaluate the adsorption capacity of the shell biomass ( Dioscorea rotundata), taking into account the impact of temperature, bed height, and particle size on the removal of nickel(II) ions in aqueous solution in a continuous fixed-bed column system; performing the modelling of the break curve. The biomass was characterised by SEM-EDS analysis. The analysis found that it represents a rough, heterogeneous structure, rich in carbon and oxygen, with mesopores, and is suitable for removing heavy metals. It also determined the optimum parameters of the bed height, particle size, and temperature, keeping the pH and the initial concentration of the solution constant. The results revealed that the bed height and the particle size are the two most influential variables in the process. Ni(II) removal efficiencies range between 85.8 and 98.43%. It was found that the optimal conditions to maximise the efficiency of the process are temperature of 70°C, 1.22 mm particle size, and 124 mm bed height. The break curve was evaluated by fitting the experimental data to the Thomas, Adams–Bohart, Dose–Response, and Yoon– Nelson models, with the Dose–Response model showing the best affinity with a coefficient of determination R2 of 0.9996. The results obtained in this research showed that yam shell could be suggested as an alternative for use in the removal of Ni(II) ions present in an aqueous solution in a continuous system.
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Authors and Affiliations

Ángel Villabona-Ortíz
1
ORCID: ORCID
Candelaria Tejada-Tovar
1
ORCID: ORCID
Rodrigo Ortega-Toro
2
ORCID: ORCID
Keily Peña-Romero
1
ORCID: ORCID
Ciro Botello-Urbiñez
1

  1. Universidad de Cartagena, Department of Chemical Engineering, Cartagena de Indias, Colombia
  2. Universidad de Cartagena, Department of Food Engineering, Carrera 6, Cl. de la Universidad 36-100, Cartagena de Indias, Colombia
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Abstract

This study aims to utilise Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) data and Standardised Precipitation Index (SPI) method to assess agricultural drought in West Papua, Indonesia. The data used in this study is monthly CHIRPS data acquired from 1996 to 2019, daily precipitation data recorded from 1996 to 2019 from the five climatological stations in West Papua, Indonesia located at Sorong, Fakfak, Kaimana, Manokwari, and South Manokwari. 3-month SPI or quarterly SPI are used to assess agricultural drought, i.e., SPI January–March, SPI February–April, SPI March-May, SPI April–June, SPI May–July, SPI June–August, SPI July–September, SPI August–October, SPI September–November, and SPI October–December. The results showed that in 2019 agricultural drought in West Papua was moderately wet to severely dry. The most severely dry occurred in September– December periods. Generally, CHIRPS data and SPI methods have an acceptable accuracy in generating drought information in West Papua with an accuracy of 53% compared with climate data analysis. Besides, the SPI from CHIRPS data processing has a moderate correlation with climate data analysis with an average R2 = 0.51.
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Authors and Affiliations

Arif Faisol
1
ORCID: ORCID
Indarto Indarto
2
ORCID: ORCID
Elida Novita
2
Budiyono Budiyono
3

  1. University of Papua, Faculty of Agricultural Technology, Jl. Gn. Salju, Manokwari, West Papua 98314, Indonesia
  2. University of Jember, Faculty of Agricultural Technology, Jember, East Java, Indonesia
  3. University of Papua, Faculty of Agriculture, Manokwari, West Papua, Indonesia

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