A method for self-desilting and unclogging of water and sand inlets of reservoir drainage and water delivery facilities

Abstract

The invention discloses a method for automatically dredging and unblocking a water and sand inlet in a reservoir water draining and conveying facility. One or more silt flushing water outlets with certain overflowing cross sections are formed in the water and sand inlet and at the proper position beside the water and sand inlet and face to the direction possibly causing deposit and blockage and favorable for conveying water and sand; the silt flushing water outlets are communicated with silt flushing water getting holes positioned above the reservoir deposit surface through a silt flushing water conveying channel, so that clear water or relative clear water can be got from the upper part of a reservoir area and a water head corresponding to the reservoir water level can be obtained by the silt flushing water outlets. When the water and sand inlet is deposited and blocked, a pressure difference is formed between each silt flushing water outlet and the water and sand inlet, and the silt flushing water outlets generate silt flushing water flow due to the pressure difference to flush the water and sand inlet and the front edge of the water and sand inlet so as to dredge and unblock the water and sand inlet; and larger silt flushing flow quantity can be formed, so that the water and sand are favorably conveyed and discharged. According to the method, the adaptive capability of the water draining and conveying facility can be improved and the technical support can be provided for measures of more completely preventing and removing silts in a reservoir.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and relates to a method for dredging and unblocking water and sand inlets of drainage and water delivery facilities such as flood discharge holes, sand discharge holes, and water delivery holes in reservoir engineering, and is beneficial to drainage. The transportation and discharge of water and sand by water transportation facilities. Background technique [0002] In order to utilize water resources and water energy resources, it is necessary to build dams to block rivers and repair reservoirs, store water to regulate runoff, and raise water levels; and reservoir projects often need to set up some low-level discharge holes such as flood discharge holes, sand discharge holes, and water delivery holes. Water delivery facilities. [0003] While the reservoir blocks the river to store water, it also intercepts sediment, causing siltation in the reservoir area. The water and s...

AI Technical Summary

Problems solved by technology

Therefore, the scouring and dredging effect that the high-pressure water gun can produce underwater has a very limited range of influence, and the efficiency of dredging is relatively poor.

It is often necessary to set up multiple water guns in various parts; moreover, the related equipment and its operation are more complicated, and the operation is not flexible

[0011] When the water and sand inlet is seriously silted up by sand, especially before the water and sand inlet is buried deep by sand and has not been opened, because the flow rate of the high-pressure water gun is very small, the amount of water provided is very limited and cannot be formed together with the cleared sand. Mud or mixed water with a certain flow rate and low sediment content cannot form effective hydraulic transportation; therefore, the water and sand formed by dredging and plugging cannot be effectively transported and discharged, and it is easy to cause a large amount of sediment to be discharged. Drainage in the channel of water delivery facilities, forming a blockage, resulting in serious consequences

In addition, the position of the water and sand inlet should not be too low when using this method of dredging and blocking the water and sand inlet, so that the amount of sediment in the reservoir is relatively large

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