ABSTRACT This research examined the influences of outflow characteristics affecting riverbank stability. The 130-km stretch of the Lower Osage River downstream from Bagnell Dam (Missouri, USA) provided an excellent case study for this purpose. The integrated BSTEM model with the HEC-RAS model was accurately calibrated and validated with data from the US Geological Survey. Then, the outflow characteristics (peak flow duration, flow drawdown rate, and low flow duration) were investigated individually. The results of this study showed that: (1) riverbank stability is little affected by the duration time of the peak flow, especially on the reaches far from the dam; (2) sudden flow drawdown significantly reduces riverbank stability; however, the impact of the drawdown rate decreases with distance from the dam; and (3) the duration of the low flow after peak flow influences the riverbank stability value proportional to the distance from the dam. The time of low flow before failure increases as the distance from the dam increases.

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水电出流特性对河岸稳定性的影响：以下奥塞奇河（美国密苏里州）为例

摘要 本研究考察了影响河岸稳定性的出流特征的影响。巴格内尔大坝（美国密苏里州）下游的奥塞奇河下游 130 公里长的河段为此提供了极好的案例研究。带有 HEC-RAS 模型的集成 BSTEM 模型经过美国地质调查局的数据准确校准和验证。然后，分别研究流出特性（峰值流量持续时间、流量下降率和低流量持续时间）。研究结果表明：（1）河岸稳定性受峰值流量持续时间的影响较小，尤其是在远离大坝的河段；(2) 突然的流量下降显着降低河岸稳定性；然而，水位下降率的影响随着距大坝的距离而减小；(3) 峰值流量后的低流量持续时间影响河岸稳定值与距坝的距离成正比。随着距大坝距离的增加，破坏前的低流量时间增加。