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Kisii University (2020)

DELINEATION OF GROUNDWATER POTENTIAL ZONES IN ARID AND SEMI-ARID LANDS USING INTEGRATED APPROACHES OF REMOTE SENSING, GEOPHYSICAL TECHNIQUES AND BOREHOLE DATA : A CASE STUDY FROM TURKANA SOUTH SUB-COUNTY, KENYA

NYABERI, MOGAKA DANIEL

Titre : DELINEATION OF GROUNDWATER POTENTIAL ZONES IN ARID AND SEMI-ARID LANDS USING INTEGRATED APPROACHES OF REMOTE SENSING, GEOPHYSICAL TECHNIQUES AND BOREHOLE DATA : A CASE STUDY FROM TURKANA SOUTH SUB-COUNTY, KENYA

Auteur : NYABERI, MOGAKA DANIEL

Université de soutenance : Kisii University

Grade : DOCTOR OF PHILOSOPHY IN NATURAL RESOURCES MANAGEMENT 2020

Résumé partiel
Groundwater is the main source of water in ASALs and indeed in Turkana South Sub-County, though its successful extraction is hampered by poor borehole siting. Thus the achievement made in the exploration, development, expansion and managing of groundwater resources of recent times has inaugurated a deployment of an integrated approach of various methods which historically were applied autonomously. Turkana South Sub-County where this research is based has a land surface of 18,000 km2 and lies between Longitudes 35˚10’00" and 36˚45’00" East and between Latitudes 1˚0’00" and 3˚0’00" North. The study employed the integration of Remote Sensing, borehole data, gravity and vertical electrical sounding in estimation of groundwater potential zones within Turkana South Sub-county. Remote sensing data has been used in extraction of several thematic maps (lithology, vegetation, drainage density, Digital Elevation Model and lineament Maps) necessary for groundwater assessment. The results attained were validated with gravity, vertical electrical sounding resistivity, and borehole data. The results were interpreted and analyzed critically to help in meeting the aim and the objectives of the research which is geared towards delimitation of groundwater potential zones in Turkana South Sub-county. The results from Vertical electrical soundings indicate that the study area has shallow aquifers in regions with low faulting and deeper aquifers in regions of intense faulting. The shallow aquifers are occurring from as low as 10 metres to 50 metres and the deeper aquifers in 55 to 140 metres deep considering both the Vertical Electrical Sounding and borehole data. From the borehole data, distribution of the boreholes on the lineament VV polarized map of the research area indicates that groundwater availability varies ; with shallow groundwater potential occurring in location that contains few lineaments, while deeper aquifer occur in areas of many lineaments

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