Geophysical Investigation of Groundwater in Wadi Lusab, Haddat Ash Sham Area, Makkah Al-Mukarramah PDF

Keywords

Ground water, geophysical, Schlumberger sounding ground magnetic surveys, akkah, Saudi Arabia

Abstract

Schlumberger sounding and ground magnetic surveys were conducted in Wadi Lusab, Hadat El-Sham area, to examine the possible existence of groundwater and structures that may control water flow. Schlumberger soundings were made along and across the Wadi Lusab. The Schlumberger sounding curves were generally of good quality, however, a few sounding curves were affected by lateral geologic inhomogeneities and man-made objects which may have distorted others. The interpreted resistivity sounding curves, cross-sections show a clear picture of the probable location of the water table, the water quality, and possible structure of the studied area. Materials with resistivities (150 to > 300 ohm-m) may represent dry alluvial deposits of sand and gravel and pebbles. Materials with resistivities (70 to 150 ohm.m) may represent sedimentary deposits of course sand and gravel saturated with good quality water. Materials with resistivities (30 to 70 ohm-m) may represent deposits composed of sand and gravel mixed with clay and probably saturated with good quality water. Materials with resistivities (10 to 30 ohm-m) may represent sedimentary deposits with a medium percentage of clay mixed with sand and gravel saturated with good quality water. Three interpreted resistivity cross sections illustrate the above findings. The ground magnetic survey, on the other hand was conducted along Wadi Lusab. It delineates the major faults and estimates the thickness of sedimentary cover. Possible existence of faults across the Wadi was confirmed by magnetic sources obtained from the application of Euler homogeneity equation to the observed profile. The magnetic interpretation shows that the thickness of the sedimentary cover in the western part of the studied area is greater than the eastern part. The western part of Wadi lusab shows a system of potential faults that may affect the water flow A profile of interpreted magnetic data illustrates the above findings