A Restoration Method of Sand Excavation Site Excavated by Small Rivers

Abstract

The invention relates to the technical field of ecological restoration engineering, in particular to a restoration method for a small river sand excavation slash. A retaining dam is constructed in the low-water period of a small river; a sand pit of the sand excavation slash and a river bottom are flattened through a large machine; biodegradable straw matting is laid and fixed; the river is longitudinally segmented; submerged plants which have roots with soil are planted on the straw matting; water is guided back in a segmented manner; and after one side is restored, the other side of the sand excavation slash is restored with the same method, and therefore ecological restoration of the sand excavation slash is achieved. A segmented governance manner is adopted for the small river sand excavation slash in the low-water period, and therefore governance difficulty is effectively reduced. The biodegradable straw matting is laid in a combined manner. An excellent habitat is provided for the submerged plants, other animals, plants and microorganisms, and biological diversity is improved. Pioneer species and successional species are combined, and therefore succession and evolution of the submerged plants are facilitated, and the method is an economical and effective ecological restoration method for the river sand excavation slash.

Description

technical field [0001] The invention relates to the technical field of restoration ecological engineering, in particular to a restoration method for sand excavation sites in small rivers. Background technique [0002] River sand is the main raw material in the construction industry. With the rapid urbanization, the demand for sand and gravel in many areas continues to increase. River basins have long been used as a source of fine aggregate for the construction industry. Unordered sand excavation makes sand pits everywhere in the river channel, which seriously damages the channel shape and the watershed ecosystem. The water conservation and supply capacity of excavated river traces keeps declining; the riverbed loses its filtration and degradation function, and the water quality deteriorates; the river floodplain wetlands and woodlands gradually disappear, and it is difficult for all kinds of waterfowl and birds to find their footprints, and the natural ecological environment...

AI Technical Summary

Problems solved by technology

[0004] The predatory exploitation of river sand resources has caused the deterioration of the ecological environment, the thickness of the sand layer has become thinner, and part of the bedrock of the river bed is exposed, making it very difficult to restore

Due to the fluidity of the water body and the complexity of the environment, there are few studies on the ecological restoration of river sand mining sites, and the specific implementation and restoration methods are not clear