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Evaluation of Peat Formation Using Geoelectrical Methods at Nile Delta, Egypt

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概要 A peat layer has been encountered in the subsurface Holocene sediments of eastern part of the Nile delta at depth ranging from 5 to 13 meters and the maximum thickness of 3m. The peat is considered as... the worst kind of foundation material that may encounter in the substrata and is often unstable for supporting any kind of structure; hence cause hazard for infra structures in the area. This study aims to investigate the credibility of the available surface geophysical tools in detecting the vertical and lateral extensions of peat layer at two sites in Mansoura city, where considerable thicknesses of peat layer are recorded by test borings. The resistivity tomography measurements simultaneously with Induced Polarization survey have been conducted along two profiles. In addition, high resolution Transient Time Domain electromagnetic soundings and Self Potential measurements were also conducted along the same two profiles. The shallow water saturated strata could affect the accuracy of the geoelectrical interpretation. However, the available lithological logs in the survey site with the multiple geophysical data could help in constraining the peat layer boundaries during data processing steps. The integrated results clearly depict the peat layer of high chargeability and relatively low resistivity, than the surrounding clay layers. A further geophysical survey to delineate the extensions of peat layer in the Nile Delta is proposed to eliminate the risk, such as a subsidence,affecting the infra structure in the area.続きを見る

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登録日 2009.04.22
更新日 2017.01.24