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Using Graphical and Multivariate Statistical Methods for Geochemical Assessment of Groundwater Quality in OuméDepartment (Côte d’Ivoire)

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Journal of Environmental Protection 2014年第12期5卷 1255-1265页

作者： Droh Lanciné Goné Aristide Gountoh Douagui Luc Bai bamory kamagaté Raymond Ligban Laboratoire de Géoscience et Environnement UFR-SGE Université Nangui Abrogoua Abidjan Cote d’Ivoire

The large demand for drinking water in Oumé Department in the Centre western of Cote d’Ivoire is supplied from groundwater sources. This study investigated the geochemical assessment of groundwater quality in Oumé Department by using a hydrochemical approach with graphical and self-organizing maps (SOM) neural network methods. It was carried out for identifying the hydrogeochemical processes related to groundwater quality, conducting a hydrochemical evaluation of the aquifer systems and delineating the various factors controlling the water chemistry and general suitability for drinking purposes. To reach these goals, groundwater was sampled from 91 locations. Results indicated that the groundwater sampled is acid (pH 4.27 - 7.10) and was weakly fairly mineralised with electrical conductivity values obtained in the range of 95 - 1071 μS·cm-1. All calcium (6.8 - 127.59 mg·L-1), magnesium (1.08 - 29.00 mg·L-1), sulphate (0 - 74.9 mg·L-1), chloride (1.2 - 89.8 mg·L-1), sodium (1.2 - 94.27 mg·L-1) and potassium (0.05 - 23.65 mg·L-1) concentrations and almost nitrate concentrations were within of the recent acceptability and healthbased of drinking-water guidelines set by World Health Organization (WHO). Moreover eleven sampling sites only have concentrations of iron above 0.3 mg·L-1 which can stain laundry and cause taste. In the water points, hydrochemical facies was calcium-bicarbonate (Ca-HCO3) type which generally shows less-polluted water quality. Based on pattern analysis, the inter-relationships among the groundwater quality variables due to the contact with different geological formations on the basis of rocks basicity and acidity were extracted and interpreted.

关键词： Weathered and Fractured Aquifers Physicochemical Quality Oumé

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Seasonal and Spatial Variations in Water Physicochemical Quality of Coastal Potou Lagoon (Côte d’Ivoire, Western Africa)

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Journal of Water Resource and Protection 2015年第9期7卷 741-748页

作者： Yéo Kandana Marthe Goné Droh Lanciné kamagaté bamory Douagui Gountoh Aristide Dembélé Ardjouma Laboratory of Geosciences and Environment University Nangui Abrogoua Abidjan C&#244 te d’Ivoire Laboratory of Agricultural Development University Nangui Abrogoua Abidjan C&#244 te d’Ivoire

The study investigates the seasonal and spatial variations in water quality parameters at four different locations along Potou lagoon for seventeen consecutive months. In order to explore spatial variation among different stations and seasonal changes, no parametric test of ANOVA was used to compare the mean values of the tested parameters for all the different sampling sites and seasons. Seasonal observations on water quality parameters and chlorophyll-a in Potou coastal lagoon revealed that the coastal water was significantly influenced by freshwater during the long and short rainy seasons. The seasonal significant variation (p a increased during the long dry season, whereas, the concentration of nutrients (nitrite, nitrate, ammonium and soluble reactive phosphorus) increased in the rainy periods. Contrary to the seasonal variation, a spatial homogeneity (horizontal) was registered for all variables, a condition related to the low human occupation in the lagoon watershed. Comparing this study with others conducted in Potou lagoon in 2008, no critical differences that evidence alteration in the water quality were found.

关键词： Potou Lagoon Water Quality and Variation

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Changes in Vegetation and Rainfall over West Africa during the Last Three Decades (1981-2010)

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Atmospheric and Climate Sciences 2015年第4期5卷 367-379页

作者： Adama Bamba Bastien Dieppois Abdourahamane Konaré Thierry Pellarin Ahmed Balogun Nadine Dessay bamory kamagaté Issiaka Savané Arona Diédhiou WASCAL/Department of Meteorology and Climate Science Federal University of Technology Akure Nigeria Centre for Agroecology Water and Resilience (CAWR) Coventry University Coventry UK Université Félix Houphouët Boigny de Cocody Abidjan C&#244te d’Ivoire IRD/LTHE Université Joseph Fourier Grenoble France Maison de la Télédétection Montpellier France Université Nangui Abrogoua Abidjan C&#244te d’Ivoire

The decadal variability of rainfall and vegetation over West Africa have been studied over the last three decades, 1981-1990, 1991-2000 and 2001-2010 denoted as 1980s, 1990s and 2000s, respectively. Climate Research Unit (CRU) monthly precipitation and Normalized Difference Vegetation Index (NDVI) from the National Oceanic and Atmosphere Administration (NOAA), all covering the period 1981-2010 have been used. This study aimed to assess the changes in the land surface condition and the spatio-temporal distribution of rainfall over West Africa region. The relationship between rainfall and vegetation indices over this region was determined using Pearson’s correlation. Also, the decadal comparison between rainfall and NDVI over the region was based on the significant t-test and the Pearson’s correlation. Results showed that significant return to wet conditions is observed between decade 1980s and decade 1990s over West Africa, and also during decade 2000s with the exception of central Benin and the western Nigeria. Meanwhile, a regreening of the central Sahel and Sudano-Sahel regions is noted. From 1990s to 2000s, this regreening belt is located in the South and the coastal areas: the Guinea Coast, Sudano-Guinea and western Sahel regions. A northward displacement of this re-greening belt is also detected. Thus, a linear relationship occurs between rainfall and NDVI in the Sudanian savannah region, but it is not the case in the rest of West Africa. This may suggest that the re-growth of vegetation in the Sudanian savannah region may be linked to rainfall supplies. Therefore, re-greening over Sahel region in 1990s is related to rainfall recovery. However, this re-greening was not sustained in the decade 2000s due to a slight decrease in rainfall.

关键词： Decadal Variability NDVI Re-Greening Rainfall Recovery Significant t-Test

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Assessment of Meteorological Drought in Climate Variability Context within the Comoe River Transboundary Watershed

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Atmospheric and Climate Sciences 2022年第1期12卷 1-17页

作者： Ismaïla Ouattara Léréyaha Coulibaly Koffi Abdelaziz Kouakou Amidou Dao Dabissi Djibril Noufé bamory kamagaté Issiaka Savané UFR Sciences Géologiques et Minières (SGM) Université de Man Man C&#244 te d’Ivoire Département de Géosciences Université Péléforo Gon Coulibaly (UPGC) Korhogo C&#244 te d’Ivoire Laboratoire Géosciences et Environnement (LGE) UFR-SGE Université Nangui Abrogoua (UNA) Abidjan C&#244 te d’Ivoire

In the context of climate variability resulting in a decrease in rainfall with a severe drought, a spatio-temporal study of this phenomenon remains imperative for the efficient management of water resources. This paper aims to assess the long-term rainfall drought trend and breakpoints within the Comoe River watershed. From monthly rainfall data series (1960-2000), Standardized Precipitation Index (SPI) values were calculated for a time scale of 3 months (SPI.3). Statistical tests for breaks (CUSUM, and t-Student) and trends (Man-Kendall and Linear Regression) as well as the Sen’ slope method for estimating the magnitude of trends was applied. The breaks dates observed are mostly located after the 1970s. Based on SPI.3 values below the threshold of 0.84 chosen as an indicator of drought, rarely has more than half of the catchment area been affected by drought. The average watershed affected is about 20% over the study period (1960-2000). The most representative years, in terms of spatial expansion of the drought, in decreasing order of importance are: 1983, 1992, 1972 and 1982. The years 1982 and 1983 stand out for their exceptional condition, as the drought-affected 50% to 90% of the total catchment area. SPI.3 series from 1960 to the various break dates recorded slopes between -0.01 and 0.00 with a slight drought trend for most of the catchment. After the break periods, almost the entire northern part of the basin is characterized by slight moisture with Sen’s slopes between 0.000 and 0.005. The southern part will remain slightly subject to normal rainfall conditions.

关键词： Climate Variability Drought SPI.3-Index Sen’s Slope Comoe River Basin

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