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Study on scale and effect of river dredging aiming at reducing flood level

1，2，3 1，2，3
GUO Qingchao ，LU Qin
（1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，Beijing 100038，China；
2. Key Laboratory of Sediment Science and Northern River Training of Ministry of Water Resources，Beijing 100048，China；
3. China Institute of Water Resources and Hydropower Research，Beijing 100048，China）

Abstract：As an engineering measure，dredging has been widely used in river regulation，reservoir capaci⁃
ty restoration，channel and harbor basin maintenance，river and lake pollutant removal，and so on. Due to
the worry of siltation after dredging， the dredging effect cannot be maintained for a long time， and dredg⁃
ing is rarely applied as a measure in river flood control. However， under the background of significant re⁃
duction of sediment inflow in the basin，it is not only possible to implement a certain scale of dredging to
enhance the flood-conveying capacity， but also there will be no serious siltation， and the dredging effect
can be retained for a long time. In this paper，the scientific and technical problems such as how to demon⁃
strate the effect of dredging on improving flood control capacity and how to determine reasonable dredging
scale are studied. The single factor relationships for main hydraulic and cross section factors with discharge
or flow depth are established， which greatly simplifies the calculation formula and improves the ability of
solving practical problems. The calculation formulas of reducing flood level and increasing flood-conveying
capacity by dredging are deduced， and the technical method of determining the reasonable dredging scale
of river channel is put forward. Based on the basic data from Songhua River and Huaihe River， a case
study is designed to demonstrate the effect of dredging on reducing flood level and determine the reason⁃
able dredging scale. The research results could provide a theoretical basis for evaluating the effect of dredg⁃
ing on improving flood control capacity and dredging design.
Keywords：river dredging；flood level；flood-conveying capacity；dredging effect；dredging scale

（责任编辑：李福田）

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