A Review of Studies on Sediment Recovery along the Lower Reaches of the Reservoir

QU Geng; HE Hai-wei; GUO Xiao-hu

doi:10.11988/ckyyb.20250354

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Journal of Changjiang River Scientific Research Institute ›› 0 DOI: 10.11988/ckyyb.20250354

A Review of Studies on Sediment Recovery along the Lower Reaches of the Reservoir

QU Geng ¹^,² ,
HE Hai-wei ¹^,² ,
GUO Xiao-hu ¹^,²

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Abstract

After the construction of the reservoir, the sediment load in the discharge flow has significantly decreased. The deposition of sediment within the reservoir may lead to erosion adjustments in the downstream river, potentially causing adverse impacts on downstream flood control, water resource utilization, and aquatic ecological environments. Additionally, the study of river sediment dynamics remains one of the key challenges in this field. This paper summarizes the existing research results from two aspects of sediment recovery characteristics and theoretical research, and obtains the following understandings: There are great differences in the process of sediment restoration in the downstream channel of different reservoirs, and the understanding of sediment restoration law in the downstream channel is not the same. There is still a lack of consensus on whether there is mutual exchange between coarse and fine sediment in the process of recovery along the river. Extensive research work has been carried out on the theory of sediment recovery saturation coefficient, and the main difficulty is concentrated on the vertical distribution of sediment concentration under the condition of subsaturated flow. Some key parameters such as unsaturated coefficient c, weighting coefficient $μ$ , sediment content $S b$ and so on have not been greatly solved. In light of certain limitations, the latest measuring instruments can be employed to conduct systematic flume experiments, and the relevant research findings can be integrated to further refine and enhance the associated theoretical framework.

Key words

Sediment restoration / Vertical distribution / Restore saturation coefficient / Research progress

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QU Geng , HE Hai-wei , GUO Xiao-hu. A Review of Studies on Sediment Recovery along the Lower Reaches of the Reservoir[J]. Journal of Changjiang River Scientific Research Institute. 0 https://doi.org/10.11988/ckyyb.20250354

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