Intrinsic random function of order k kriging of electrical resistivity data for estimating the extent of saltwater intrusion in a coastal aquifer system
Intrinsic random function of order k kriging of electrical resistivity data for estimating the extent of saltwater intrusion in a coastal aquifer system
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用于估计沿海含水层系统中盐水入侵程度的电阻率数据 k 阶克里金法固有随机函数
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
I. Sung
中科院分区：
文献类型：
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作者：
B. Shim;S. Chung;H. Kim;I. Sung
在韩国釜山东南部的一个滨海含水层系统中，利用电阻率分布进行了盐水入侵研究。根据水文地质特征将该含水层系统划分为4层，通过对电阻率资料的地质统计解释，确定各层盐水侵入的水平范围。用协方差模型进行k阶本征随机函数(IRF-k)克立格法，得到空间平均电阻率平面。通过交叉验证对克立格估计值进行了评估，其结果与真实值吻合较好。交叉验证的统计量代表估计的低误差。在地表以下5米以上的电阻率等值线图上，从东侧开始观察到咸水入侵的主导方向。这些结果使作者得出结论，将地质统计学技术应用于电阻率数据，对于评估滨海含水层系统中的咸水入侵是有用的。
A saltwater intrusion study using electrical resistivity distribution was conducted in a coastal aquifer system in the southeastern part of Busan, Korea. This aquifer system is divided into four layers according to the hydrogeologic characteristics, and the horizontal extent of intruded saltwater is determined at each layer through the geostatistical interpretation of electrical resistivity data. Intrinsic random function of order k (IRF-k) kriging is performed with covariance models to produce the plane of spatial mean resistivities. The kriged estimates are evaluated by cross validation, and they showed a good agreement with the true values. The statistics of cross validation represented low errors for the estimates. In the resistivity contour maps more than 5 m below the surface, a dominant direction of saltwater intrusion was observed beginning from the east side. These results led the authors to conclude that the application of geostatistical technique to electrical resistivity data is useful for assessing saltwater intrusion in a coastal aquifer system.