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Journal of Water Resource and Protection 2024年第1期16卷 83-101页

作者： kouadio Michel Yao Tanina Drissa Soro tanoh jean jacques koua Akaie jean Fabrice Tchakray Yao Emile Desmond Konan Brou Dibi Laboratory of Sciences and Technologies of Environment University Jean Lorougnon Guede Daloa C&ocircte d’Ivoire

The main objective of this study is to determine the hydrogeochemical specificities of the groundwater of the Angovia mine operating permit, located in the Yaouré mountains in the center-west of Côte d’Ivoire. To do so, descriptive and multivariate statistical analysis methods with the SOM (Self Organizing Maps) algorithm were applied to the physicochemical parameters of 17 boreholes using the calcite (ISC) and dolomite (ISD) saturation indices. The results obtained have shown that the groundwater in the Angovia mine operating permit area has an average temperature of 27.52°C (long rainy season) and 27.87°C (long dry season) and has an average pH of 7.09 ± 0.35 during the main rainy season and 7.32 ± 0.35 during the main dry season. They are mineralized with an average electrical conductivity of 505.98 ± 302.85 μS/cm during the long rainy season and with 450.33 ± 233.74 μS/cm as average during the long dry season. The main phenomena at the origin of groundwater mineralization are water residence time, oxidation-reduction and surface inflow. The study of the relative age of the water shows that the groundwater in the Angovia mine operating permit area is mainly undersaturated with respect to calcite and dolomite. They are therefore very old in the aquifer with a slow circulation speed during the long rainy season and the long dry season.

关键词： Hydrogeochemistry Mineralization Fissure Aquifers Operating Permits The Angovia Mine

Assessment of Sediment and Pollutants in Buyo Lake, Ivory Coast, Using SWAT （Soil and Water Assessment Tool） Model

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Journal of Chemistry and Chemical Engineering 2013年第11期7卷 1054-1059页

作者： tanoh jean-jacques koua jean Patrice Jourda Kan jean kouame kouao Armand Anoh Laboratory for Remote Sensing and Spatial Analysis Applied to Hydrogeology Fdlix Houphouet-Boigny University ofCocody-Abidjan Abidjan 22522 Ivory Coast Environment and Mechanical Engineering Department "'Vasile Alecsandri'" University of Bacau Bacau 600015 Romania

The changes in land use in the last 30 years in the territory of agro-forest watershed of Lake Buyo resulted in significant sediment into the lake. Sediments are a preferred means of transportation for certain pollutants, like phosphorus in excess. By mapping the source areas of erosion, the authors can determine the risk areas and help to prioritize interventions in the territory. This mapping is done using the SWAT （soil and water assessment tool） model. Several types of data, including topography, land use, soil and climate data are needed to run the model. In this paper, all different steps are presented, from the designing of HRU （hydrological response units）, basic units to run the SWAT model until the simulations. The establishment of HRU has three main stages： space discretization, land use and soil data integration and HRU distribution：（1） space discretization which consist in extracting the limits and the water network of the watershed from the DEM （digital elevation model） and in subdividing them into sub-basins; （2） land use and soil data integration： it consists in digitizing the physical maps of land use and of soils under Mapinfo 7.5 and in keeping them in ＂shape＂ format; （3） HRU distribution： it leads to subdivide the sub-watersheds in small units that combine a single soil type and one type of land use. It appears from this study to obtain 23 sub-watersheds and 71 HRU. Once the HRU designed, it is necessary to integrate climate data, data on physico-chemical characteristics of soils and agricultural practices, before starting the simulations. This will allow the model to assess the risk of sedimentation and eutrophication of the lake using the MUSLE （modified universal soil loss equation） and phosphorus cycle.

关键词： Erosion land use SWAT model phosphorus sediment.

Implementation of the Semi-Distributed SWAT (Soil and Water Assessment Tool) Model Capacity in the Lobo Watershed at Nibéhibé(Center-West of Côte d’Ivoire)

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Journal of Geoscience and Environment Protection 2021年第8期9卷 21-38页

作者： tanoh jean-jacques koua Yeganantham Dhanesh Jaehak Jeong Raghavan Srinivasan kouao Armand Anoh jean Lorougnon Guédé University Environmental Sciences and Technologies Laboratory Daloa C&#244 te d’Ivoire Texas A & M University Spatial Sciences Laboratory College Station Texas USA Texas A & M AgriLife Research Temple Texas USA

The Lobo watershed is an agricultural area where the use of fertilizers by farmers is intensive, causing eutrophication problems that deteriorate the quality of drinking water distributed to the population. Since the phenomenon of eutrophication is directly linked to runoff, it is essential to model the flow in order to better control the transfer of nutrients responsible for eutrophication. It is within this framework that this study was conducted. The objective of this study is to assess the ability of the semi-distributed SWAT (Soil and Water Assessment Tool) model to simulate runoff in the Lobo watershed. The methodology adopted was based on the use of the QSWAT graphical interface to manipulate and execute the main functions of the SWAT model from QGIS tools. The hydrological modeling was carried out with the QSWAT interface for SWAT 2012. The results showed good performance for the flow calibration (1982-1984) with the evaluation criteria R2, NSE and PBIAS respectively of 0.64, 0.64 and 3.1. In the validation period (1984-1987), the model also showed good performance in the streamflow simulation for R2 and NSE of 0.84 and 0.76 respectively as values. However, for the PBAIS criterion, the result was less good but still remains satisfactory with a value of 19.6. It emerges from this study that the SWAT model is suitable for simulating water transfer and can therefore be used to study the transfer of pollutants in the fight against eutrophication in the Lobo watershed.

关键词： Modelling SWAT Lobo Eutrophication Côte d’Ivoire

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

Evaluation of Agricultural Practices Scenarios for Reducing Erosion in Buyo Lake Catchment (Sassandra;Cote d’Ivoire) by Use of GIS

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Journal of Geoscience and Environment Protection 2019年第7期7卷 154-171页

作者： jean-jacques tanoh koua Armand kouao Anoh Drissa Tanina Soro jean Kan kouame Roger jean Patrice Jourda Environment Training and Research Unit Jean Lorougnon Guédé University Daloa Cote d’Ivoire Earth Sciences and Mineral Resources Training and Research Unit Felix Houphouet Boigny University Abidjan Cote d’Ivoire University Center for Research and Application in Remote Sensing Abidjan Cote d’Ivoire

This study has used RUSLE model factors within a GIS component to evaluate eroded soil and developed viable agricultural practices scenarios to reduce soil loss in Buyo Lake catchment in the Western region of Côte d’Ivoire. Consequently, five study cases were tested as following: scenario 1—association of dense forest and crops with a high percentage of mulch;scenario 2—corn and sorghum combination by considering a high yield without conventional tillage;scenario 3—establishment of an herbaceous meadow;and scenario 4—association of palm, coffee, and cocoa with green cover. Scenario P was the setting up of straw mulch after corn or sorghum harvest. The erosion map resulting from these study cases showed by estimation, an average of soil loss of about 95 t/ha/year. The respective values obtained for the scenarios 1, 2 and 3 are 28 t/ha/year, 66 t/ha/year and 30 t/ha/year. This indicates a decrease of 68%. By scenario 4, the estimated average was 2 t/ha/year corresponding to a decrease of 98%. The combination of scenario 2 with scenario P gave soil losses average of 5 t/ha/year, i.e. a 95% reduction. This study shows that the association of palm, coffee, and cocoa with green cover would be very effective in reducing soil loss.

关键词： Agricultural Practices Soil Erosion Scenarios Buyo Lake Catchment Cote d’Ivoire