A kind of forward and reverse scouring and dredging method of diversion channel of hydropower station and structure of diversion channel

Abstract

The invention provides a method for forward and reverse scouring and dredging of the diversion canal of a hydropower station and the structure of the diversion canal. The method includes: step S10, determining the gradation of the silt in the diversion canal; step S20, The grading curve determines the representative particle size of the silt and the corresponding starting flow rate; step S30, according to the Manning formula, determines the starting flow required to remove the silt by water flow; step S40, according to the The starting flow and the discharge capacity curve of the diversion canal determine the target opening of the diversion canal gate; step S50, according to the target opening, first open the diversion gate at the head of the diversion canal for forward flushing, Then open the gate of the power generation diversion tunnel at the tail of the diversion canal to carry out reverse flushing. Based on the technical scheme of the present invention, dredging by hydraulic forward and reverse flushing is used to remove a large amount of silted sand at relatively low cost, reducing the power generation loss and dredging cost of hydropower stations caused by silted sediment.

Description

technical field [0001] The invention relates to the technical field of dredging of hydropower stations, in particular to a dredging method for forward and reverse scouring of a diversion channel of a hydropower station and a structure of the diversion channel. Background technique [0002] In the field of hydropower stations, hydropower stations with small storage capacity generally use lateral water diversion to generate power. The water flow in the river channel enters the water diversion tunnel of the hydropower station through the diversion channel, and then passes through the machine to generate electricity. Therefore, the diversion channel is an important structure of the hydropower station, and its flow capacity is one of the key links affecting the power generation efficiency of the hydropower station. It is difficult for a hydropower station with a small storage capacity to reduce the sediment content entering the power generation system by sedimentation in the rese...

AI Technical Summary

Problems solved by technology

It is difficult for a hydropower station with a small storage capacity to reduce the sediment content entering the power generation system by sedimentation in the reservoir. A large amount of sediment easily enters the aqueduct with the water flow, causing siltation in the aqueduct, thereby reducing the flow capacity of the aqueduct, which in turn leads to diversion for power generation. Insufficient; the siltation of the diversion channel has a great impact on the power generation efficiency, and is one of the concerns in the operation of small and medium-sized hydropower stations

[0003] At present, the sediment deposited in the diversion channel is generally removed by mechanical dredging, but this dredging method is time-consuming, laborious and expensive

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