北京市再生灌区地下水动态特征及数值模拟研究

Groundwater Dynamic Characteristics and Numerical Simulation for Reclaimed Water Reclaimed Water Irrigation District

摘要: 本文基于GMS软件建立了北京市再生水灌区地下水数值模型，预测了不同情景下地下水的动态变化趋势及调控方案。研究表明，随着再生水灌区的再生水利用率逐步提高，灌区内的地下水水位逐步抬升，向下游地区的侧向排泄量也呈加大趋势；为了减少下游的侧向排泄量、避免该区域由于地下水位过高而产生土壤次生盐渍化，应控制灌区内的地下水位埋深；再生水利用率达到50%时，每年需开采出3307.2万m³置换的浅层地下水资源，再生水利用率达到70%时，每年需开采出4567.0万m³置换的浅层地下水资源，再生水利用率达到90%时，每年需开采出6128.3万m³置换的浅层地下水资源。研究成果对再生水的安全利用、地下水资源的涵养具有重要意义。

Abstract:  In order to predict the changing trends of groundwater under different scenarios and make regulation programs, a groundwater numerical model of reclaimed water irrigation district is developed based on GMS software. Research results indicate that with the gradual increase of reclaimed water utilization, irrigation area groundwater level progressive uplift, lateral excretion to the lower reaches also show a trend of increase. In order to avoid the soil salinization, shallow groundwater resources must be mining to control the depth of groundwater according to the different utilization rates of the reclaimed water. 50% of total water consumption is reclaimed water, 33.1 million m³ replacement of shallow groundwater resources should be exploited, 70% of total water consumption is reclaimed water, 45.7 million m³ replacement of shallow groundwater resources should be exploited, 90% of total water consumption is reclaimed water, 61.3 million m³ replacement of shallow groundwater resources should be exploited. The results are meaningful to guide safety usage with reclaimed water and conservation of groundwater resources.