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Document Type |
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Article In Journal |
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Document Title |
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High Resolution Ground Magnetic Survey (HRGM) for Determining the Optimum Location of Subsurface Dam in Wadi Nu’man, Makkah Al Mukarammah, KSA المساحة المغنطيسية الأرضية ذات التحليل العالي لتحديد الموقع الأمثل لإقامة سد تحت سطحي في وادي نعمان بمكة المكرمة بالمملكة العربية السعودية |
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Subject |
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Earth Science |
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Document Language |
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English |
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Abstract |
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Wadi Nu’man is considered as one of the major subsurface water carrier wadies in Makkah Al-Mukarama area. HRGM studies are carried out along the study area. HRGM survey is utilized for deciphering the magnetic anomalies over the western part of this wadi, to study the basement surface topography, to determi ne the locations of subsurface water channels and to determine the optimum location for constructing subsurface dam in order to desperately raising the groundwater level to the point where Ain Zubida can flow again. Some rock samples were collected for susceptibility studies. The total magnetic field, F, was measured at short station interval which varies from 5 to 10 meters. Micropulsation and diurnal variations were recorded and removed to ensure high quality data. The total intensity magnetic map is referenced to the IGRF field. The main trends shown in the anomaly map are NNW-SSE, N-S, and NE-SW (to ENE-WSW) directions. 2-D downward continuation, analytic signal and Euler deconvolution techniques have been utilized along selected 10 profiles for intensive quantitative studies. Results of such analysis show that the basement surface topography varies from the western limb of the study area (shallow basement) to the eastern one (relatively deep). Furthermore, the basement is dissected by a system of crossing faults and /or geologic contacts that run in NNW-SSE, N-S, and NE-SW (to ENE-WSW) directions. These are very comparable to the surface geology exposed at the northern and southern mountains of the study area. Subsurface water channels can be clearly detected from the continuation sections. Euler deconvolution and spectral analysis of the profiles data confirms the continuation results. 2D modeling along selected sampled profiles shows warping of the basement topography along the central axis of the wadi, leaving the water channels on both flanks. Finally, the proposed site location for constructing the subsurface dam is clearly determined. |
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ISSN |
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1012-8832 |
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Journal Name |
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Earth Sciences Journal |
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Volume |
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19 |
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Issue Number |
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1 |
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Publishing Year |
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1429 AH
2008 AD |
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Number Of Pages |
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26 |
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Article Type |
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Article |
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Added Date |
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Sunday, October 11, 2009 |
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Researchers
| محمد مصطفى غباشي | Mohamed M. Gobashy | Researcher | | |
| منصور عبدالله القرني | Mansour A. Al-Garni | Researcher | | |
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