Method for reducing heavily silt-carrying river reservoir deposition

Abstract

The invention relates to a method for reducing heavily silt-carrying river reservoir deposition, and belongs to the field of water conservancy. The IPC of the method is E02B1 / 00 and E02B9 / 02. According to the method, a sand blocking ground sill is built in a reservoir, the reservoir is divided into a clean water reservoir area and a muddy water reservoir area, distant silt carrying flow on the upstream of a dam is efficiently drained out of the reservoir through sand transporting culverts, the targets of reservoir filling and desilting are achieved, and the reservoir rainfall scouring distance is enlarged. Fine particle sediment overflowing to the reservoir area before the dam from the sand blocking ground sill is discharged out of the reservoir through dam flood discharging tunnel spillways in a submersible sand pumping pump reservoir desilting mode. The wide, shallow and bent deposition forms in the reservoir areas are shaped in a submersible sand pumping pump dredging mode, reservoir area straight river channels of density flow transporting are facilitated, and the natural desilting effect of the reservoirs is improved. The method is used in heavily silt-carrying river reservoir building and deposition waste reservoir reconstruction projects.

Description

Technical field: [0001] The invention relates to a method for general water conservancy engineering, in particular to a method for reducing silt in sandy river reservoirs, and its IPC international patent classification numbers E02B1 / 00 and E02B9 / 02 belong to the field of water conservancy. Background technique: [0002] With the development of economy and society, human beings have more and more demands on the development and utilization of rivers, and more and more water conservancy projects are built on rivers. In particular, a considerable number of reservoirs in sandy rivers have lost their normal water storage function due to severe sedimentation. The dams and their ancillary buildings built for water storage and profit also lost their functions, resulting in a shortage of resources. Serious waste; at the same time, with the endless development of rivers by human beings, there are fewer and fewer dam sites suitable for building reservoirs on rivers, which are far from ...

AI Technical Summary

Problems solved by technology

[0002] With the development of economy and society, human beings have more and more demands on the development and utilization of rivers, and more and more water conservancy projects are built on rivers. In particular, a considerable number of reservoirs in sandy rivers have lost their normal water storage function due to severe sedimentation. The dams and their ancillary buildings built for water storage and profit also lost their functions, resulting in a shortage of resources. Serious waste; at the same time, with the endless development of rivers by human beings, there are fewer and fewer dam sites suitable for building reservoirs on rivers, which are far from meeting the requirements of social development for the development and utilization of water resources, and further development and utilization of water resources are needed Support the sustainable development of the economy and society; on the other hand, with the strengthening of environmental protection and the improvement of people's living standards, soil and water conservation has made considerable progress and remarkable results, coupled with the continuous advancement of sediment resource utilization and silt land reclamation , the amount of sediment entering the reservoir is significantly reduced, and it is possible to use the natural sediment discharge of the reservoir combined with manual dredging and dredging to maintain the sustainable use of the reservoir

In the past, the construction of water conservancy projects mostly consisted of building a dam to form a single reservoir, mainly using the dead storage capacity to retain sediment and discharge sand with different density currents. Some reservoirs have also carried out simple manual dredging and dredging of reservoirs. There is no precedent for the construction or reconstruction of water conservancy projects in two reservoir areas of clear water and muddy water by combined use of sediment-retaining submerged dams, and there is no precedent for reservoir dredging to be discharged out of the reservoir through the supporting buildings of the dam

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