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首页> 外文期刊>Pure and Applied Geophysics >On the Salt Water Intrusion into the Durusu Lake, Istanbul: A Joint Central Loop TEM And Multi-Electrode ERT Field Survey
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On the Salt Water Intrusion into the Durusu Lake, Istanbul: A Joint Central Loop TEM And Multi-Electrode ERT Field Survey

机译：论伊斯坦布尔杜鲁苏湖的盐水侵入：联合中央环旋转TEM和多电极ERT现场调查

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摘要

Durusu Lake is the biggest and most important freshwater source supplying drinking water to the European side of Istanbul. In this study, electrical resistivity tomography (ERT) and transient electromagnetic (TEM) measurements were applied to detect a possible salt water intrusion into the lake and to delineate the subsurface structure in the north of Durusu Lake. The ERT and TEM measurements were carried out along six parallel profiles extending from the sea coast to the lake shore on the dune barrier. TEM data were interpreted using different 1-D inversion methods such as Occam, Marquardt, and laterally constrained inversion (LCI). ERT data were interpreted using 2-D inversion techniques. The inversion results of ERT and TEM data were shown as resistivity depth sections including topography. The sand layer spreading over the basin has a resistivity of 150-400 Omega m with a thickness of 5-10 m. The sandy layer with clay, silt, and gravel has a resistivity of 15-100 Omega m and a thickness of 10-40 m followed by a clay layer of a resistivity below 10 Omega m. When the inversion of these data is interpreted along with the hydrogeology of the area, it is concluded that the salt water intrusion along the dune barrier is not common and occurs at a particular area where the distance between lake and sea is very close. Using information from boreholes around the lake, it was verified that the common conductive region at depths of 30 m or more consists of clay layers and clay lenses.
机译：杜鲁苏湖是向伊斯坦布尔欧洲一侧供应饮用水的最大和最重要的淡水来源。在这项研究中，电阻率层析成像（ERT）和瞬变电磁（TEM）测量被应用于检测可能的咸水入侵，并描绘杜鲁苏湖北部的地下结构。ERT和TEM测量沿着从海岸延伸到沙丘屏障湖岸的六条平行剖面进行。TEM数据使用不同的一维反演方法进行解释，如Occam、Marquardt和横向约束反演（LCI）。ERT数据采用二维反演技术进行解释。ERT和TEM数据的反演结果显示为包括地形在内的电阻率深度剖面。遍布盆地的砂层电阻率为150-400Ωm，厚度为5-10 m。含有粘土、淤泥和砾石的砂层电阻率为15-100Ωm，厚度为10-40 m，然后是电阻率低于10Ωm的粘土层。当这些数据的反演与该区域的水文地质一起解释时，得出的结论是，沿着沙丘屏障的盐水入侵并不常见，而是发生在湖与海之间距离非常近的特定区域。利用湖泊周围钻孔的信息，验证了30m或更深处的公共导电区域由粘土层和粘土透镜体组成。

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