南水北调中线沿线劣质地下水对输水水质的潜在风险分析

确保南水北调中线工程供水水质安全是工程运行成功的关键。现通过对中线工程总干渠沿线地下水进入渠道可能性分析的基础上，建立典型渠段数值模型定量计算地下水与渠系水在水量与水质的转化。研究结果表明：工程内排排水的布设使地下水与渠系水存在水量与水质的紧密联系；地下水向渠道的排入量取决于地下水水位与总干渠渠道水位之间水位差的变化情况以及区域水文地质条件；根据现有资料基础上的河北磁县境内渠段模拟计算结果，即使在假定的污染风险达到极大的情况下，排入渠道的劣质地下水对渠系水水质基本不构成影响。

Potential Risk Analysis for Impact of Contaminated Groundwater on Water Quality in Middle Route of the South-to-North Water Diversion Project

It's one of the most important issues to ensure water quality in MiddIe Route of the South-to-North Water Diversion Project(SNWDP). Based on the possibility analysis which groundwater might drain into the main canal of the SNWDP,the numerical model for the CIXIAN section was set up for quantitatively simulating the interaction of Water quality and quantity between canal water and groundwater along the canal.The results showed that the comprehensive interaction existed,which was affected by the dynamic variation of the water-head difference between canal water and groundwater as well as regional hydrogeologic conditions.According to the simulation calculations,there was no impact on canal water quality even under the most serious scenario in which the groundwater along the CIXIAN section was contaminated very seriously.