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Using “Water Evaluation and Planning” (WEAP) Model to Simulate Water Demand in Lobo Watershed (Central-Western Cote d’Ivoire)

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Journal of Water Resource and Protection 2021年第3期13卷 216-235页

作者： Affoué Berthe Yao Oi Mangoua Jules Mangoua eblin sampah georges Alioune Kane Bi Tié Albert Goula Environmental Science and Technology Laboratory Department of Earth Sciences Jean Lorougnon Guede University Daloa C&ocirc te d’Ivoire PHD School Water Quality and Uses of Water Faculty of Letter and Human Sciences Cheikh Anta Diop University Dakar Senegal Training and Research unit Environmental Sciences and Management Nangui Abrogoua University Abidjan C&ocirc te d’Ivoire

Climate change continues to pose a threat to the sustainability of water resources while, water need is increasing. In spite of the efforts made by the state authorities to build water infrastructure, a large majority of the population is not having access to drinking water. In this study, Water Evaluation and Planning (WEAP) model was used to model the current situation of water supply and demands, to create scenarios for future water demands and supply. The results show that, in contrast to the livestock sector, which has a zero DNS, huge deficits are observed in reference scenario. These unsatisfied demands (DNS) are dominated by deficits in rice irrigation. The analysis of the evolution of demand according to the growth scenarios has shown that the deficits already observed in the reference scenario will reach 100.45 × 106 m3 in 2040. To mitigate the effects of such deficits, water management optimization measures have been proposed. Strengthening the water supply to urban centers from the creation of dams could considerably reduce the observed deficits. These results are an important decision support tool for sustainable water resource management in the Lobo watershed. However, these strategies to improve access to water depend on the government’s political will on water and economic opportunities.

关键词： WEAP IWRM Request Site Water Resources Unsatisfied Demand Côte d’Ivoire

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Assessment of Vulnerability to Groundwater Pollution in the Lobo Watershed at Nibéhibé(Central-West, Côte d’Ivoire)

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Journal of Water Resource and Protection 2020年第8期12卷 657-671页

作者： Yiwa Monique Kamenan Oi Mangoua Jules Mangoua Brou Dibi sampah eblin georges Kouakou Lazare Kouassi Kouamé Auguste Kouassi Laboratory of Science and Technology of Environment Jean Lorougnon Guédé University Daloa C&ocirc te d’Ivoire Laboratory Geosciences et Environment Nangui Abrogoua University Abidjan C&ocirc te d’Ivoire

Drinking water supply to people in rural areas is increasingly oriented towards the search for groundwater. However, these resources, which were once of good quality, are currently threatened by various sources of pollution points and diffuse. The objective of this study is to map the intrinsic vulnerability to groundwater pollution of the Lobo watershed in Nibéhibé. The intrinsic vulnerability mapping method, PaPRIKa adapted or PaPRI which acronym is the protection of aquifers (Pa) based on three criteria: P for protection, R for rock type, I represents infiltration was used. The results show three (3) vulnerability classes, which are moderate, high and very high. This map shows that the high vulnerability class (89%) dominates the study area. This predominance shows that the groundwater of the Lobo watershed is at high risk of pollution.

关键词： Pollution Groundwater Vulnerability PaPRI Côte d’Ivoire

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Mineralization of Natural Spring Water in the City of Daloa (West-Central Côte d’Ivoire)

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Journal of Geoscience and Environment Protection 2020年第12期8卷 200-210页

作者： eblin sampah georges Konan Kouakou Séraphin Ohou-Yao Marie-Jeanne Adélaïde Mangoua Oi Mangoua Jules Dibi Brou Kouassi Kouakou Lazare Department of Earth Sciences Jean Lorougnon Guédé University of Daloa Cote d’Ivoire

The water from natural springs in the city of Daloa is increasingly used by the population for its drinking water needs, even though its quality remains unknown. This study aims to determine the acquisition mechanism of the mineralization of these waters. Thus, physicochemical analyses were carried out on 10 spring water samples in February 2019. A summary statistical analysis of the results obtained shows that these waters are acidic (4.81 ≤ pH ≤ 5.39) and very weakly mineralised, with 50% of the conductivities below 100 μS·cm-1. The average iron (0.5 ± 1.02 mg/L) and manganese (0.61 ± 0.90 mg/L) contents show that these two parameters are increasing in the spring water. The Normalized Principal Component Analysis (NPCA) shows that mineralization is mainly controlled by surface inputs of elements (anthropogenic pollution), then the oxidation-reduction phenomenon and, finally, the water-rock contact (mineralization-residence time). Otherwise, the very low expression of water-rock contact (mineralization-residence time) in the acquisition of the mineralization reflects a short residence time of the water in the aquifer.

关键词： NPCA Mineralization Natural Spring Daloa Côte d’Ivoire

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Assessment of Vulnerability to Groundwater Pollution in the Lobo Watershed at Nibéhibé (Central-West, C?te d’Ivoire)

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Journal of Water Resource and Protection（水资源与保护） 2020年第8期

作者： Yiwa Monique Kamenan Oi Mangoua Jules Mangoua Brou Dibi sampah eblin georges Kouakou Lazare Kouassi Kouamé Auguste Kouassi

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Contribution of Agro-Hydrological Modeling in the Evaluation of Water Availability of an Ungauged Basin Reservoir in Côte d’Ivoire: Case of the Loka Reservoir in Bouaké

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Computational Water, Energy, and Environmental Engineering 2021年第3期10卷 117-130页

作者： Kouao Armand Anoh Kouakou Séraphin Konan sampah georges eblin Ange Victorine Atcho Kouakou Lazare Kouassi Water and Environment Science and Technology Laboratory Jean Lorougnon Guedé University Daloa C&ocirc te d’Ivoire

The city of Bouaké, the second biggest city of Côte d’Ivoire, experienced a water shortage in 2018 that lasted four months due to the drying up of the Loka reservoir, which supplies two-thirds of the city. The challenge of the Loka reservoir is that it is located in an ungauged basin where very few hydrological studies have been carried out, despite the recurrent problems of access to drinking water. In the purpose to better understand the phenomena that caused this temporary drying of the dam, the methodology implemented was based on agro-hydrological modeling with SWAT using a regionalization technique of a nearby watershed. The model performance was assessed using three statistical indices (the Nash-Sutcliffe coefficient (NS), the coefficient of determination (R2) and the percentage of bias (PBIAS)) and the visual appreciation of hydrographs for monthly series. The statistical indices appear satisfactory with a NS and R2 ≥ 0.6 both for calibration and validation, and a PBIAS of -11.2 and -3.8 respectively for calibration and validation. The hydrological modeling of Loka basin has shown the impact of climate change already reported by some authors as well as anthropization. Thus, while the reservoir records a decrease in its water volume estimated at 384,604 m3 each year, the water demand undergoes an increase of 122,033 m3 per year.

关键词： Loka Basin Hydrological Modeling SWAT SUFI-2 Water Availability

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Modelling Freshwater Availability Using SWAT Model at a Catchment-Scale in Ivory Coast

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Journal of Geoscience and Environment Protection 2017年第13期5卷 70-83页

作者： Kouao Armand Anoh Tanoh Jean Jacques Koua sampah georges eblin Kan Jean Kouamé Jean Patrice Jourda Environment Department Jean Lorougnon Guede University Daloa Ivory Coast Hydrogeology Department Felix Houphou&#235t-Boigny University of Abidjan Abidjan Ivory Coast

Sustainable management of Ivory Coast’s freshwater reserve at a catchment scale is an essential way in the policies of land use sustainable management. Thus, the implementation of physical conceptual semi-distributed SWAT model required a good knowledge of the watershed and a large number of physic-chemical data available that have been prior adapted to Ivory Coast’s climatic and soil conditions. The whole simulation span was divided into calibration set (1982-1986) and validation set (1987-1990). The SUFI-2 algorithm was used for parameters optimization. The sensitivity analysis focused on 8 parameters related to runoff, soil, evaporation, main channel and groundwater. The performance criteria were based on the P-factor, R-factor and the two objective functions which are Nash-Sutcliffe coefficient and the coefficient of determination. Although Taabo river basin like African basins suffers from a significant lack of data, the objective functions showed the robustness of the model to climate variability. The calibration launched during a wet period gave objective functions higher than 0.7 while validation performed in less humid period gave performance criteria around 0.6. During the simulation period, Taabo river basin daily green water ranged from 0.044 to 50.257 mm/day with a total average of 3,090.9 mm per year. As for blue water, it is ranged from 0.032 to 0.552 mm/day with an annual total average of 29.19 mm.

关键词： SWAT SUFI2 Taabo River Basin Blue Water Green Water

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Hydrological Characterization of Water Resources Used for Sugarcane Production in the Sugar Complexes of Ferkessedougou (North of Côte d’Ivoire)

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Journal of Geoscience and Environment Protection 2021年第12期9卷 1-15页

作者： Affoué Berthe Yao sampah georges eblin Gla Blaise Ouedé Kouakou Lazare Kouassi Do Ange Désiré Soro Arona Diedhiou Bi Crépin Péné Laboratory of Environmental Sciences and Technologies UFR Environment Jean Lorougnon Guédé University Daloa C&#244 te d’Ivoire Laboratory NEXUS “Climate Water Agriculture Energy Nexus and Climate Services” Research and Development Institute Felix Houphou&#235 t Boigny University Abidjan C&#244 te d’Ivoire Research and Development Department SUCAF-CI Ferkessedougou C&#244 te d’Ivoire

Water resources, although renewable, are limited and threatened by climate change and anthropic activities. Assessment and forecasting of these resources can provide valuable information for water resource planners. This study aims to quantify the surface water resources used for sugarcane production in sugar complexes of Ferkessedougou. This is based on the morphological characterization of the river Morrison and Lopkoho dams and on extreme daily flow probability of occurrence estimation using frequency analysis method. The bathymetric survey showed that the Morrison Dam impoundment had a maximum depth of 11.98 m;a water capacity of 11,656,735.5 m3. For the Lokpoho dam, the reservoir had a maximum depth of 8.82 m, which corresponds to a water volume of 4,354,531.5 m3. Nevertheless, the water capacity of these reservoirs is greatly reduced by a large volume of sediment estimated at 1,013,058.96 m3 for Morrison and 599,740 m3 for Lokpoho. Statistical analysis of maximum daily flows shows that flows between 73.9 and 100 m3/s have the potential to occur every five years at the Route Korhogo Badikaha hydrometric station. The recurrence of the decennial (298 m3) and quinquenal (248 m3) flows shows the importance of the flood flows of the Bandama River. It also shows that the low water levels of the Bandama are very pronounced. The minimum flow that SUCAF-CI water managers should expect every five years is 1.36 m3/s and the ten-year low flow is 2.10 m3/s. These results are indicators of water scarcity risks and could guide decision making in the Ferkessedougou sugar complexes.

关键词： Bathymetric Survey Flow Quantile Return Period Sugar Complexes Côte d’Ivoire

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Contribution of Agro-Hydrological Modeling in the Evaluation of Water Availability of an Ungauged Basin Reservoir in Côte d’Ivoire: Case of the Loka Reservoir in Bouaké

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Computational Water, Energy, and Environmental Engineering（水能与环境工程） 2021年第3期

作者： Kouao Armand Anoh Kouakou Séraphin Konan sampah georges eblin Ange Victorine Atcho Kouakou Lazare Kouassi

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