Step sand-blocking dam ecosystem for reservoir desilting and sand prevention

Abstract

Provided is a step sand-blocking dam ecosystem for reservoir desilting and sand prevention. According to topographical conditions, a reasonable position is selected, in the outer river segment of the upstream backwater area of the reservoir area, as a dam site where a sand-blocking dam is built. The dam site where the sand-blocking dam is built is leveled by areas. The lower filling bag dam body of the sand-blocking dam is built by segments and layers on a cleared and leveled river bed by adopting large reservoir desilting soil filling bag technology; the upper dam body of the sand-blocking dam is built by adopting gabion boxes. Ecological restoration and protection are conducted on the surface of the sand-blocking dam, and ecological restoration is conducted on rivers in the upstream and downstream areas of the sand-blocking dam. According to the step sand-blocking dam ecosystem for reservoir desilting and sand prevention, reservoir area desilting soil is used for building the dam and an ecological protection slope surface, so that not only is building cost reduced, but also ecological management and protection are combined into a whole by using local resources; water and soil loss in the reservoir area can be reduced, the ecological environment of the reservoir upstream area and surrounding areas is significantly improved. The step sand-blocking dam ecosystem for reservoir desilting and sand prevention is suitable for siltation prevention and treatment and ecological management work of reservoirs with heavy vegetation damage, ecological environment deterioration and heavy water and soil loss in large reservoir areas in central and western regions.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering, and in particular relates to a cascaded sand retaining dam ecological system for reservoir dredging and sand prevention. Governance work. [0002] This patent is funded by the Ministry of Water Resources' public welfare industry scientific research project "Complete technology research on ecological control of small and medium-sized rivers and their bank slopes in the west (No: 201301022)". Background technique [0003] Reservoir siltation is an unresolved major problem in water conservancy and hydropower construction in the world. In recent years, the International Conference on Large Dams, the International Conference on Irrigation and Drainage, the International Conference on Hydraulics and many countries have begun to pay attention to the research of this subject. Reservoir siltation is that after the water flow enters the reservoir area, because the water depth increases along ...

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Problems solved by technology

[0004] The current reservoir dredging technology is basically blank, and more than 90,000 reservoirs in China currently have sedimentation problems, especially in the northwest region due to serious soil erosion, and the reservoirs are seriously silted. For example, the Kizil reservoir in Xinjiang has a design storage capacity of 700 million cubic meters. Water storage and operation began in the 1990s. Up to now, the reservoir has deposited nearly 200 million cubic meters, seriously affecting the safety and normal operation of the reservoir. It is urgent to propose reliable reservoir dredging and anti-silting technology to solve the serious reservoir deposition problem.

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