Drid area grit gravel grit gravel stone river current ecological repairing river course infiltration reduction method

Abstract

The invention discloses a river permeability reducing method in arid area grit stone river ecology restoring project, which comprises the following steps: mixing sodium bentonite and local soil to mixed soil evenly with dry weight ratio 1 : 9; mixing the mixed soil and grit material evenly with dry weight ratio at 4 : 6; forming permeability reducing mixed material; paving the permeability reducing mixed material layer on the compacted river bed; paving local soil permeability reducing layer; vibrating and packing together; back-paving on site ballast on the permeability reducing layer as covering layer. This invention possesses distinctive economic benefit, which can be used to permeability reducing agent project of river, lake and marshland.

Description

1. Technical field [0001] The invention relates to a method for reducing seepage of a river course, in particular to a method for reducing seepage of a river course in ecological restoration projects of gravel rivers in arid areas. 2. Background technology [0002] The sand and gravel rivers involved in the arid areas are generally located in the middle and upper reaches of the watershed, and the river bed is mainly composed of sand, gravel or pebbles, with high water permeability. However, in arid areas, water resources are often scarce, and a small amount of river water is mostly due to the high water permeability of the river bed. It is in a state of subsurface flow. Affected by global climate change and social and economic development, the shortage of water resources has become more serious. The time and space ranges affected by drought have been significantly expanded, and many rivers are often dry. [0003] Rivers are an important part of the natural ecosystem, an impo...

AI Technical Summary

Problems solved by technology

Although the first two can play a good anti-seepage effect, they have adverse effects on the natural ecosystem of the river, and damage the water phase (river water), soil phase (river bed, river bank), gas phase (contact part above the water surface) and biological phase. The interconnection of plants, animals and microorganisms in and around the river destroys the natural ecosystem of the river, the river loses its self-purification ability, and the deterioration of water quality accelerates; the third option has slightly less impact on the natural ecosystem than the first two, but in A layer of refractory foreign matter is added to the river channel, which is not in harmony with the natural river channel. At the same time, once it is washed by floods, it may be lifted up in pieces; the seepage prevention of the clay layer has a good ecological effect, but there are erosion resistance in the sand and gravel river channels in mountainous areas. The disadvantage of weak ability, there is also a shortage of clay resources in some areas

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