Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Application of geophysical techniques for groundwater investigation in Lake Naivasha area Kenya

Auteur : Gressando Yulian

Etablissement de soutenance : International Institute for Aerospace Survey, Netherlands

Grade : Master of Science (MSc) 1999

Résumé
The area of investigation is situated geographically between 210000 220000 m and 9930000 9906000 m (UTM grid system). Administratively, it is within the Naivasha Area, Nakuru District, and Republic of Kenya. The survey’s purpose is twofold : * To characterize electrical resistivities of subsurface strata in the area to try to relate the geophysical response to groundwater depth. To study the geophysical response of faults in the study area. In order to reach this objective, a geophysical survey was carried out in the selected area including the following activities : * Measurement and analysis of 25 vertical electrical soundings (VES). ? Measurement and analysis of 5 horizontal electrical profiles (CST). * Preparation and study of two geophysical well logs in recently drilled boreholes in the area. * Study of regional magnetic data (made available by ITC, Delft). For the resistivity work an ABEM Terrameter 300C was used, while for the geophysical well logging an ABEM Terrameter SAS LOG 200 was employed. Both instruments belonged to the Water Resources Assessment Project in Kenya (WRAP) which is a co-operation project between the Netherlands and Kenyan Governments. After a preparation period at ITC (Enschede) the fieldwork took place in Kenya in October 1998. During this period a crew of 4 persons (WRAP Project) with a 4x4 vehicle was made available by WRAP. In Chapters 1 to 5, the study area is introduced and a discussion is given of the geophysical methods used. The analysis and results are presented in Chapter 6. Conclusions and recommendations may be found in Chapter 7.

Sujets : Lake Naivasha, Kenya/Watershed/Groundwater/ ;

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