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由于上中游水资源的过多开发利用,我国西北干旱区有些内陆河下游来水量急剧减少,从以前的常年性河流逐渐转变成现在的间歇性河流,给当地带来了一系列严重的生态环境问题。根据间歇性河流河道充水和停水过程周期性重复出现的水文特征,建立了河道两侧区域地下水运动的一维非稳定流模型,提出了把流量边界条件与水位界条件相互转换来求解模型的一种方法。最后应用上述模型分析西北某内陆河下游间歇性输水条件下河道两侧地区地下水位恢复状况,为输水生态效应的定量评价提供了理论基础。
Due to the excessive development and utilization of water resources in the upper and middle reaches, some of the inland river reaches in the arid region of Northwest China have drastically reduced their inflow of water from the previous perennial rivers to the present intermittent rivers, bringing a series of serious ecological problems to the local area Environmental issues. According to the periodic recurring hydrological characteristics of water inflow and outflow in intermittent river channels, a one-dimensional unsteady flow model of groundwater movement on both sides of the river is established. The model is solved by converting the flow boundary conditions and the water boundary conditions A method. Finally, applying the above model to analyze the recovery of groundwater table on both sides of the river under intermittent water conveyance in the lower reaches of an inland river in northwestern China, which provides a theoretical basis for the quantitative evaluation of the ecological effects of water conveyance.