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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2016.1
- 수록면
- 403 - 413 (11page)
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The most productive lands in the coastal area of Saudi Gulf of Aqaba lie in Wadi Humeidah, where irrigation relies predominantly on groundwater. Crop yields have been lately reduced due to increased salinity of groundwater and have led to abandonment of some wells adjacent to the Gulf area. Geophysical and geochemical investigations were combined to assess seawater-contaminated zones in the shallow coastal groundwater aquifer and to identify subsurface geologic formation. The prevalence of Ca2+, Na+, Cl– and SO4 2– suggests that weathering of surrounding rocks is potentially the major source of ions. Characterization of aquifer conditions up to a depth of 60 m showed that the groundwater aquifer is composed of three zones with vertically different resistivity values. The surface layer with resistivity of 30–1000 ohm-m, represents the alluvial sand and gravel. The second layer with lower resistivity values ranging from 0.6 to 70 ohm-m, indicates saline-to-brackish-to-slightly fresh water saturated rocks. The third layer extending up to a depth of 60 m is dominated by resistivity values of several hundred to several thousand ohm-meters, reflecting the basement rocks. While the groundwater is generally brackish, the salinity content varied spatially with TDS values that decreased in the northeast direction. The variations in TDS are related to multiple sources and primarily dependent on dissolution of saltbearing sediments, exploitation rate, over-irrigation with salty water, aquifer-bearing strata and the location of wells. Groundwater aquifers in the vicinity of the coastline were found to have been impacted by saline water. The central east area has a type of groundwater that is relatively less brackish.
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