Aquifer systems in Kordofan, Sudan

Subsurface lithological model

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Subsurface lithological/hydrogeological investigations were conducted in west-central Sudan to define aquifer systems, their quality and extensions. Separated by a low-lying central basement dome, the Bara and Kosti Basin Complexes accommodate thick clastic sedimentary rocks and provide a supply of groundwater. An examination of numerous boreholes from the database of the National Corporation for the Development of Rural Water Resources (NCDRWR) has revealed two aquifer systems: upper and main. The main aquifer system is semi-confined and most often lies under hydraulic pressure created by an overlying aquitard of a clayey nature, whereas the upper system is a water table aquifer. The upper aquifer extends from the north of the study region to the latitude 13°10 north and is composed predominantly of well-sorted sand dunes in the upper part and partially of the Umm Rawaba Formation in its lower part. The Umm Rawaba Formation, which is Late Tertiary-Pleistocene unconsolidated fluviolacustrine sediments, forms the main aquifer system. The average hydraulic conductivity and thickness were estimated to be 9.89.10-5 m/sec and 70 m and 6.8.10-6 m/sec and 150 m for the upper and main aquifer, respectively. Groundwater generally flows along the axial troughs of the Bara and Kosti Basins from the northwest to the southeast showing progressive increase in salinity owing to an ionic exchange with abundant evaporitc minerals down the gradient. Based on water quality and availability, west-central Sudan is divided into three zones: western, central and eastern. In the western zone where groundwater is shallow and recharge is adequate, water exploitation is unchallenging. Water exploration in the central and eastern zones should be aided by geophysical methods. High salinity in the eastern zone requires a careful selection of productive zones and the sealing of saline zones.

Original languageEnglish
Pages (from-to)585-598
Number of pages14
JournalSouth African Journal of Geology
Volume109
Issue number4
DOIs
Publication statusPublished - Dec 2006

Fingerprint

aquifer
salinity
aquitard
groundwater
clastic rock
geophysical method
sealing
basin
water availability
dome
groundwater flow
dune
water table
hydraulic conductivity
sedimentary rock
recharge
trough
borehole
water resource
Pleistocene

ASJC Scopus subject areas

  • Geology

Cite this

Aquifer systems in Kordofan, Sudan : Subsurface lithological model. / Abdalla, Osman A E.

In: South African Journal of Geology, Vol. 109, No. 4, 12.2006, p. 585-598.

Research output: Contribution to journalArticle

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