Method for determining average slope angle of sediment deposits in front of dam of river retaining building

Abstract

The invention discloses a method for determining the average slope angle of sediment deposits in front of a dam of a river retaining building, which is mainly applied to the fields of water conservancy projects, channel projects, river regulation and the like, and the method recognizes that the sediment particle size of a riverbed is closely related to the size of water flow, and the near-bottom flow velocity of the water flow in a river channel accords with Gaussian distribution. And according to the distribution probability of the water flow, the probability distribution of the riverbed sediment particle size is deduced. On the basis, the characteristic flow and the characteristic water level of the river channel, the characteristic parameters of the river channel, the resistance coefficient of a riverbed and the like are counted, and the average particle size of the sediment deposits in front of the dam of the river retaining building is obtained through numerical integration. Through an indoor test, a relational expression between the sediment particle size and the sediment water slope angle is established, the water slope angle of sediment of the sediment deposition body in front of the river dam is obtained through the relational expression, and the angle is the average slope angle of the sediment deposition body in front of the river dam.

Description

technical field [0001] The invention relates to a method for determining the average slope angle of sediment deposits in front of a dam of a barrage structure, and is mainly used in the fields of water conservancy engineering, waterway engineering, river course management, and the like. Background technique [0002] Sediment deposition is a major issue to be solved in hydraulic engineering. After repairing ship locks, dams and other structures to block the river, the flow process of the river is changed, the flow velocity is reduced, and siltation easily occurs upstream. The form of sediment deposition in front of the river barrage is often determined by the way the river barrage is used, such as: the opening method of the gate, the control and operation rules of the sand discharge hole, etc. The prediction of the shape of the sediment deposits in front of the barrage buildings plays an important role in the function of the buildings and the later scheduling. [0003] At p...

AI Technical Summary

Problems solved by technology

For example, some scholars have investigated the shape of scour funnels in front of the dams of Liujiaxia, Bapanxia, ​​Qingtongxia and Yanguoxia reservoirs in the upper reaches of the Yellow River, but there is no effective method for determining their slopes, which is critical for the full play of reservoir functions. more unfavorable

For some navigable river sections, the sediment deposition in front of the river barrage will also affect the navigation efficiency

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