Effect of well cleaning and pumping on groundwater quality of a tsunami‐affected coastal aquifer in eastern Sri Lanka
Effect of well cleaning and pumping on groundwater quality of a tsunami‐affected coastal aquifer in eastern Sri Lanka
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清井和抽水对斯里兰卡东部受海啸影响的沿海含水层地下水质量的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
K. H. Jensen
中科院分区：
文献类型：
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作者：
M. Vithanage;K. Villholth;K. Mahatantila;P. Engesgaard;K. H. Jensen
2004 年 12 月 26 日海啸和随后的抽水修复尝试对斯里兰卡东海岸沙质含水层的水质变化进行了调查。对受干扰（抽取地下水的地方）和未受干扰（没有抽取地下水的地方）两个横断面进行了监测。在未受干扰的地区，受海啸影响的井的平均电导率（EC）在灾后第一个完整雨季后从3000μS/cm下降到1200μS/cm；然而，在受干扰的区域，平均 EC 稳定在 1500 μS/cm 左右。通过计算水文地球化学混合比进一步分析观测结果，结果表明受干扰地点的海水比例高于未受干扰地点。大量抽水和随后对井附近抽水的处理所造成的物理清洁所造成的干扰可能导致含水层中盐度的滞留。
Changes in water quality of a sand aquifer on the east coast of Sri Lanka due to the 26 December 2004 tsunami and subsequent remediation attempt by pumping were investigated. Two transects, disturbed (where pumping of groundwater took place) and undisturbed (where no pumping occurred), were monitored. In the undisturbed area, the average electrical conductivity (EC) in the wells affected by the tsunami showed a decrease from 3000 to 1200 μS/cm after the first full rainy season following the disaster; however, in the disturbed area the average EC stabilized around 1500 μS/cm. The observations were further analyzed by calculating hydrogeochemical mixing ratios, which showed that the seawater fraction was higher in the disturbed site than in the undisturbed site. The disturbance caused by physical cleaning by extensive pumping and subsequent disposal of the pumped water adjacent to the wells likely led to retention of salinity in the aquifer.