Study on the situation and evolution trend of karst water pollution in Xingtai City
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摘要: 由于地表水的污染和固体废物的乱堆放,导致邢台市岩溶水多处出现污染现象,且污染范围不断扩大,严重威胁下游水源地的供水安全。本文依据大量水质监测数据,评价了岩溶水的污染现状,采用数值方法预测了污染源继续存在和污染源得到治理两种情况下地下水污染的演化趋势,并分析了其对水源地的影响。预测结果表明:污染源存在时,地下水污染物Cr6+超标浓度等值线将以0.769m/d的速度扩散;在污染源得到有效治理和控制后,地下水污染物超标浓度等值线扩散速度将减少至0.402m/d,可见污染源治理对减缓地下水污染的扩散有重要作用。预测结果可作为选择地下水保护方案和污染治理措施的依据。Abstract: Surface water pollution and solid waste disorderly piling up have led to contamination of karst groundwater in many places in Xingtai City and the polluted scope is continually enlarged, which is severely threatening water safety in downstream. On the basis of a large number of water quality monitoring data, the pollution situation of karst water was analyzed, two tendencies of groundwater pollution are predicted by means of numerical method under the circumstance of the polluting sources being controlled or the polluting sources still existing, and the impact of water pollution on water source is analyzed too. Predictions indicate that, if polluting sources still existing, the isoline of out of limits Cr6+ concentration will diffuse at the speed of 0.769 m/d; if polluting sources being controlled, the diffusing speed will reduce to 0.402 m/d. So, it thus clear that polluting sources treatment is of important role to slow down the diffusion of contaminants. The predicted results can be chosen as the basis for groundwater protection and pollution control.
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