Influences of retrogressive erosion of reservoir on sedimentation of its downstream river channel——A case study on Sanmenxia Reservoir and the Lower Yellow River
Influences of retrogressive erosion of reservoir on sedimentation of its downstream river channel——A case study on Sanmenxia Reservoir and the Lower Yellow River作者机构：State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Institute of Water Resources and Hydropower Research
出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))
年 卷 期：2017年第32卷第3期
页 面：373-383页
核心收录：
学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 081502[工学-水力学及河流动力学] 0903[农学-农业资源与环境] 0816[工学-测绘科学与技术]
基 金：financially supported by the National Key Research and Development Program of China(2017YFC0405201) IWHR Special Project(KY1749)
主 题：Retrogressive erosion River sedimentation Reservoir operations
摘 要：Retrogressive erosion, a widespread phenomenon of sediment transport in reservoirs, often impacts on both the reservoir capacity and the sedimentation in the downstream river channel. Based on field data from the Sanmenxia Reservoir and the Lower Yellow River over the past decades, three courses of retrogressive erosion with distinctive features were analyzed. The results indicate that retrogressive erosion,especially caused by rapid reduction in the water level till the reservoir is empty, often results in the serious siltation of the lower Yellow River and threatens the safety of the flood control in the Lower Yellow River. Unreasonable operation of the reservoir and incoming hyperconcentrated floods accompanied by retrogressive erosion also aggravate the siltation of the main channel of the river. However, a reasonable operation mode of the reservoir so named storing the clear(low sediment concentration)water in the non-flood season, and sluicing the muddy(high sediment concentration) water in the flood season was found, which might mitigate the deposition in both the reservoir and the Lower Yellow River. This operation mode provides important experience for the design and operation of large reservoirs in other large rivers carrying huge amounts of sediment.
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