A coupled soil water balance model for simulating depression-focused groundwater recharge

In arid and semi-arid environments focussed infiltration of rain and snowmelt water under topographic depressions is an important mechanism of groundwater recharge. Quantifying the aggregated recharge from numerous small depressions is a major challenge in water resource management. Building on field-based investigations into the surface water-groundwater interaction of individual depressions and their catchments (i.e. uplands) in the Canadian Prairies, we have developed a simple water balance model to simulate groundwater recharge considering the hydrological coupling of a depression-upland system. The model is based on the Versatile Soil Moisture Budget (VSMB), which has been widely used in the Canadian Prairies to simulate soil moisture conditions. We evaluated the new model, VSMB Depression-Upland System (VSMB-DUS) using field data consisting of an artificial flooding experiment and long-term monitoring of a depression in Alberta, Canada. The model captured surface water level, soil...在干旱与半干旱环境中，地形洼地下方的雨水与融雪水集中入渗，是地下水补给的重要机制。量化众多小型洼地产生的总补给量，是水资源管理中的一大难题。本研究基于加拿大大草原地区单个洼地及其集水区（即高地）的地表水-地下水相互作用野外调查，开发了一款简易水量平衡模型，用以模拟考虑洼地-高地系统水文耦合作用的地下水补给过程。该模型以通用土壤水分收支模型（Versatile Soil Moisture Budget, VSMB）为基础，该模型此前已在加拿大大草原地区广泛用于模拟土壤水分状况。我们利用加拿大阿尔伯塔省某洼地的人工洪水试验与长期监测野外数据，对这款新模型——洼地-高地系统通用土壤水分收支模型（VSMB Depression-Upland System, VSMB-DUS）——进行了评估。该模型能够准确模拟地表水水位、土壤……