干旱区间歇性河流河道两侧地下水运动模型及其求解方法

Groundwater Movement Model and its Calculation Method in the Riverside of Intermittent Rivers in the Arid Region

本文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。

Because of the excessive development and utilization of water resources at the upper and middle reaches of many rivers in the arid region of northwest China, the water amount of their lower reaches is decreased quickly, now it gradually turned into the intermittent rivers from the perennial rivers in the past, which results in a series eco - environmental problems in the locality. Based on the periodically hydrological features of intermittent rivers, the article establishes one-dimension unsteady flow model of groundwater movement in the riverside area of intermittent river, puts forward a new method of converting two kinds of boundary conditions of discharge and water level for the model. At last, it applies the model to analyze groundwater movement in the riverside under the case of intermittent water conveyance at the lower reaches of a river in Northwest China and provides the theoretic foundation for the quantitative assessment of ecological effects of the water conveyance.