%0 Journal Article
%T Analyse des propri¨¦t¨¦s hydrodynamiques des aquif¨¨res fissur¨¦s de la r¨¦gion de San-Pedro (Sud-Ouest de la C te d¡¯Ivoire)
%A De-Lasme
%A O. Z.
%A Lasm
%A T.
%A Oga
%A M. S.
%A Youan-Ta
%A M.
%J Estudios Geologicos
%D 2012
%I Consejo Superior de Investigaciones Cient¨ªficas
%R 10.3989/egeol.40672.159
%X San-Pedro area is localized in south-western C te d¡¯Ivoire and covers a surface of 6912 km2. Wa t e r resources exploited in this area are constituted of surface waters and groundwater of weathered and fissured aquifers. The aims of this study are to analyze hydrodynamic properties of fissured aquifers of San-Pedro on statistical and geostatistical viewpoints for a better knowledge and management of groundwater resources. Data base includes 110 drillings tapping fissured aquifers. Transmissivity was calculated by interpreting of pumping tests with classical methods. Specific capacity was calculated at the end of the third step for all drillings after correction of drawdowns. Transmissivity and specific capacity values oscillate between 1,27.10-6 and 8,59.10-4 m2.s-1 and between 1,09.10-2 m2.h-1 et 13,2 m2.h-1, respectively. These two parameters span three orders of magnitude showing the strong heterogeneity of the medium. An empirical relationship was established between transmissivity and specific capacity of San-Pedro area. This relationship can be used to determine transmissivity in the sectors where this data is lacking. Variogram of transmissivity is characterized by a double structuring. Transmissivity assessment by kriging is satisfactory, observed and estimated values are comparable. The findings obtained in this study lead to a better understanding of hydrogeological properties of south-western C te d¡¯Ivoire. [fr] La r¨¦gion de San-Pedro est localis¨¦e dans le sud-ouest de la C te d¡¯Ivoire et couvre une superficie de 6912 km2. Les ressources en eau exploit¨¦es dans cette r¨¦gion sont constitu¨¦es des eaux de surface et des eaux souterraines des aquif¨¨res des alt¨¦rites et de fissures du socle pr¨¦cambrien. La pr¨¦sente ¨¦tude a pour objectif d¡¯analyser les propri¨¦t¨¦s hydrodynamiques des aquif¨¨res fissur¨¦s de San-Pedro d¡¯un point de vue statistique et g¨¦ostatistique, en vue d¡¯une meilleure connaissance et gestion des ressources en eau souterraine. La base de donn¨¦es comporte 110 forages captant les eaux des fissures profondes. La transmissivit¨¦ a ¨¦t¨¦ d¨¦termin¨¦e par interpr¨¦tation des essais de pompage ¨¤ l¡¯aide des m¨¦thodes classiques. Le d¨¦bit sp¨¦cifique (Q/s) a ¨¦t¨¦ calcul¨¦ pour tous les forages au niveau du troisi¨¨me palier, apr¨¨s correction des rabattements. Les valeurs de la transmissivit¨¦ et du d¨¦bit sp¨¦cifique oscillent respectivement entre 1,27.10-6 et 8,59.10-4 m2.s-1 et entre 1,09.10-2 m2.h-1 et 13,2 m2.h-1. Ces deux param¨¨tres s¡¯¨¦chelonnent sur trois ordres de grandeurs montrant l¡¯h¨¦t¨¦rog¨¦n¨¦it¨¦ du milieu. Une relation empirique a ¨¦t¨¦ ¨¦tablie ent
%K fissured aquifer
%K San-Pedro
%K transmissivity
%K specific capacity
%K empirical relationship
%K kriging
%K aquif¨¨re fissur¨¦
%K San-Pedro
%K transmissivit¨¦
%K d¨¦bit sp¨¦cifique
%K relation empirique
%K krigeage
%U http://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/871/903