断流河道输水对地下水净补给量研究——以塔里木河下游为例

依据塔里木河下游断流河道2000—2006年8次生态输水期间地下水埋深监测数据,拟合了输水后地下水埋深与离河距离关系的曲线方程,进而对输水后地下水的补给量及其变化特征进行了计算和分析,探讨了生态输水的横向影响范围及其变化特点。结果表明,塔里木河下游区域输水后地下水总净补给量为7.82487亿m3,占总下泄水量的35.63％。8次输水过程中,除第2次输水和第6次输水外,其余各次输水期间,地下水净补给量都呈下降趋势。对输水后横向影响范围的分析表明,横向影响范围与输水量大小和持续时间密切相关。随着输水的进行,横向影响范围呈明显扩大趋势,纵向上各断面的横向影响范围的变化表现出了局部波动,整体变化与距离输水源头远近呈弱相关性的特点。

Study on Net Groundwater Recharge after Ecological Water Conveyance in the Lower Reaches of Tarim River

The groundwater depth was monitored in nine groundwater-monitoring sections and forty monitoring wells during water conveyance for the lower reaches of the Tarim River from 2000 to 2006. This paper analyzed the response of groundwater depth to water conveyance. The results showed that the total net volume of recharged groundwater was 78 248.7×104 m3 after ecological water conveyance, accounting for 35.63% of the ecological inflow water. Among the eight water conveyance processes, the groundwater recharge was positive except the second and the sixth. The transverse influenced range of groundwater has close relation with the water conveyance amount and duration, extending with water conveyance processes. With distance increasing from water source the transverse influenced range of groundwater becomes narrow, showing alienated relation of groundwater recharge with distance from water source.