CONCEPTION DE MODÈLES STATISTIQUES A VARIABLES HYDROCHIMIQUES POUR LA PRÉDICTION DE LA CONDUCTIVITÉ ÉLECTRIQUE DES EAUX SOUTERRAINES
Journal Title: Larhyss Journal - Year 2014, Vol 20, Issue 20
Abstract
The study takes place on the regions of N'zi-Iffou-Moronou (ex-N'zi-Comoé), located in East-Central of Ivory Coast with an area of 19,560 km². The objective of this study is to develop statistical models using multiple linear regressions able to simulate the electrical conductivity of groundwater from physical and chemical parameters of water. Sample from 193 boreholes were used for this study. The physical parameters are temperature, pH, turbidity and electrical conductivity. Chemical parameters selected are the major cations and major anions. The methodology consisted on the one hand, a normalized principal component analysis (NPCA) to identify the relevant variables, on the second hand, the model calibration to determine the coefficients of linear regressions and standard errors associated. The results of the normalized principal component analysis show that the most relevant and expressive modeling of the electrical conductivity of groundwater variables are the sum of the major cations and the sum of the major anions. These two parameters have been used as variables for designing a first model. Also, to show the impacts of anthropogenics activities on groundwater quality, a second model was proposed by integrating the temperature and pH in the first model. The values of the coefficient of variation on the coefficients of regression of the explanatory variables are relatively low (lower than 10%) with regard to the chemical parameters whatever the model. They are followed by the pH (23%) then the temperature (511%).
Authors and Affiliations
KOUASSI A. M| Institut National Polytechnique Félix Houphouët-Boigny (INP-HB) ; Département des Sciences de la Terre et des Ressources Minières (STeRMi), Laboratoire du Génie Civil, des Géosciences et des Sciences Géographiques, BP 1093 Yamoussoukro Côte d’Ivoire, MAMADOU A. | Institut National Polytechnique Félix Houphouët-Boigny (INP-HB) de Yamoussoukro, Ecole Supérieure des Mines et de Géologie (ESMG), Bp: 1093 Yamoussoukro Côte d’Ivoire, AHOUSSI K. E. | Université Félix Houphouët-Boigny d’Abidjan-Cocody, Unité de Formation et de Recherche des Sciences de la Terre et des Ressources Minières (UFR-STRM), Laboratoire des Sciences et Techniques de l’Eau et de l’Environnement (LSTEE) ; 22 BP 582 Abidjan 22, Côte d’Ivoire, BIEMI J. | Université Félix Houphouët-Boigny d’Abidjan-Cocody, Unité de Formation et de Recherche des Sciences de la Terre et des Ressources Minières (UFR-STRM), Laboratoire des Sciences et Techniques de l’Eau et de l’Environnement (LSTEE) ; 22 BP 582 Abidjan 22, Côte d’Ivoire
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