Research on Water Scour Conditions of Wanjiazhai Reservoir, China

Kunhui Hong, Shouyuan Zhang, Wei Zhang*, Teng Wu

*Corresponding author for this work

Research output: Chapter in Book or Report/Conference proceedingConference Proceedingpeer-review


Flood control, power generation and agricultural irrigation are the primary functions of reservoirs. The main reason for the serious deposition in the Yellow River reservoir is the high concentration of sediment in the water flow. Due to the establishment of the Yellow River cascade reservoir and the joint scheduling among reservoirs, the flow rate of the downstream reservoir decreases in flood season, which reduces the hydrodynamic flushing efficiency in the reservoir area. Wanjiazhai Reservoir is selected as the research sample in the present study, which is a first-level cascade reservoir in the connecting area of the upper and middle reaches of the Yellow River. In this study, a numerical model was built to analyze factors that influenced the operation and flushing of the upstream reservoir. And a formula was recommended to apply to the Wanjiazhai Reservoir on the basis of the sediment deposition pattern discrimination formula. Besides, various flushing methods and methods reducing the sediment deposition were carried out and analyzed. Results indicated that when the inflow rate increased, the maximum particle diameter of the incipient sediment was larger. When the inflow rate reached 1200 m3/s, the diameter of the initial the incipient sediment varied from 0.015 mm to 0.094 mm. And the diameter range of the initial the incipient sediment was 0.014 mm–0.094 mm, when the inflow rate was 1800 m3/s. When the inflow rate reached 2500 m3/s, the diameter of the initial the incipient sediment varied from 0.010 mm to 0.094 mm. Notably, all sediment were discharged from the reservoir. Moreover, the sediment of the reservoir was flushed at a flow rate of 1200 m3/s–1800 m3/s under the premise of meeting the upstream water storage.

Original languageEnglish
Title of host publicationProceedings of PIANC Smart Rivers 2022 - Green Waterways and Sustainable Navigations
EditorsYun Li, Yaan Hu, Philippe Rigo, Francisco Esteban Lefler, Gensheng Zhao
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages9
ISBN (Print)9789811961373
Publication statusPublished - 2023
Externally publishedYes
Event10th PIANC Smart Rivers Conference, Smart Rivers 2022 - Nanjing, China
Duration: 18 Oct 202221 Oct 2022

Publication series

NameLecture Notes in Civil Engineering
Volume264 LNCE
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


Conference10th PIANC Smart Rivers Conference, Smart Rivers 2022


  • Hydrodynamic simulation
  • Reservoir scour
  • Sediment starting size
  • Wanjiazhai Reservoir


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