Quantifying the Effects of Water Management Decisions on Streambank Stability

The module estimates streambank stability using a factor of safety approach, with hydrologic conditions derived from an established integrated hydrologic model, HydroGeoSphere, coupled with the surface water operations model, OASIS. This module is validated and then demonstrated using simulations from the Lower Republican River Basin in Kansas, USA. Results indicate that several water management decisions, such as groundwater pumping and timing of reservoir releases, may negatively affect streambank stability by changing pore water pressure, the weight of the bank material, and the pressure differential between the surface and the subsurface. Given that most of the rivers and streams of the world are regulated by reservoir operations, this work demonstrates that water management practices need to be considered in simulations of streambank stability.

本模块采用安全系数法评估河岸稳定性，其中水文条件由成熟的集成水文模型HydroGeoSphere推导，并与地表水操作模型OASIS耦合。该模块经过验证并在美国堪萨斯州共和河下游流域的模拟中予以展示。结果表明，诸如地下水抽排和水库泄水时间等若干水资源管理决策，可能通过改变孔隙水压力、河岸材料重量以及地表与地下之间的压力差，对河岸稳定性产生负面影响。鉴于世界上大多数河流和溪流均受水库操作所调控，本研究证实了水资源管理实践在河岸稳定性模拟中的重要性。