Method for reinforcing sand retaining impoundment of soil check dam or sediment storage dam in collapse gully mouth

Abstract

The invention discloses a method for strengthening the sand-blocking and water-storage of the tugufang or the sand-blocking dam at the mouth of the Benganggou. To build Tugufang or earth sand-holding dam in the downstream of Bengangkou, the dam site should be selected at a place with a relatively slow gradient of the ditch and a large silting area, and then between the bottom of the Bengangkou and the valley square or sand-retaining dam downstream of the Bengangkou Bamboo plants are planted in the area, and grass plants are planted between the bamboos. After the implementation of bamboo planting management, the content of organic matter and nitrogen, phosphorus and other nutrients in the collapsed gully bed and alluvial (diluvial) fan soil increased significantly, the soil was improved, and the plant growth conditions were improved. After the bamboo has grown into a forest, it can be sustainably managed and utilized, and it can be selectively felled for construction, transportation, furniture, papermaking, craft weaving, etc., and certain economic benefits can be obtained.

Description

Technical field: [0001] The invention belongs to the field of water and soil erosion control, and in particular relates to a method for strengthening the sand-blocking and water-storage method of a tugufang or a sand-blocking dam at the mouth of a benggang ditch. Background technique: [0002] Collapsing hill erosion is a serious type of water and soil loss, which is widely distributed in low mountain and hilly areas in the south. Serious collapsing hill erosion can destroy land resources, destroy basic farmland, deteriorate the ecological environment and aggravate natural disasters, seriously threatening the land, ecology and public health. Safety. The method of "blocking at the top, blocking at the bottom, and greening in the middle" is generally adopted for the treatment of collapsed hills. Ditches are dug at the top of the collapsed hills to intercept the surface catchment on the water-collecting slope, and valley squares or sand dams are built at the mouth of the collap...

AI Technical Summary

Problems solved by technology

However, due to the confluence of the water-collecting slope at the upper part of the collapse and the high and steep slope inside the collapse, erosion from the source of the ditch head, erosion and collapse of the wall of the collapse, and secondary erosion of the colluvial piles continue to occur, and the runoff carries sediment from above. However, it is directly discharged downwards, causing sediment to deposit in front of the Gufang or the check dam, and part of the sediment is even discharged downstream from the spillway along with the runoff.

After long-term continuous erosion and deposition, the gully mouth area at the bottom of the collapsed hillock has become a silt deposit, and the vegetation growth conditions have become very harsh, and most of them will become barren land. Even if trees and shrubs are planted, it is not easy to grow into a forest. The safety and stability of the sand check dam has also been affected to a certain extent, cracks or damage have occurred, and the high-sediment runoff discharged from the spillway also directly threatens the ecological security of the downstream area of ​​the collapsed hill

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