Ecological permeability-reducing method of sand channel

Abstract

The invention relates to an ecological permeability-reducing method and a new ecological permeability-reducing sand of a sand channel, and the method and sand provided by the invention are suitable for the dry regions in the north. The IPC (International patent classification) is E02B 3 / 00. The ecological permeability-reducing method of the channel comprises the following main steps of: preparing the ecological permeability-reducing sand, clearing the channel, compacting a foundation, paving a permeability-reducing layer, and backfilling a protecting layer. The ecological permeability-reducing sand is prepared by mixing local fine sand and bentonite, wherein the dry-weight percentage of the local fine sand is 75-85% and the dry-weight percentage of the bentonite is 25-15%. In the invention, two natural materials are adopted, the main components are materials of the engineering on site and are utilized locally, the cost is low, the ecological permeability-reducing material and the natural channel are integrated into a whole, a better permeability-reducing effect can be achieved, and not only can the requirements for reducing permeability and retaining water in ecological restoration of the river be met, but also the health development of the ecological system of the river can be maintained. The method and sand provided by the invention can be applied in permeability-reducing engineering of rivers, lakes and wetlands and have remarkable economic, social and ecological benefits.

Description

1. Technical field [0001] The invention relates to a river ecological seepage reduction method and a new ecological seepage reduction material, which is especially suitable for sandy river ecological seepage reduction projects in northern arid regions, and its IPC international patent classification number is E02B 3 / 00. 2. Background technology [0002] The sandy rivers and lakes involved in the arid areas are generally located in the middle and upper reaches of the watershed, and the riverbed 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 riverbed. However, in the undercurrent state, affected by global climate change and social and economic development, the shortage of water resources has become more serious, and the time and space ranges affected by drought have been significantly expanded, and many riv...

AI Technical Summary

Problems solved by technology

Although the former two can play a good anti-seepage effect, they have adverse effects on the natural ecosystem of the river course, damage the interconnection of water phase, soil phase, gas phase and biological phase, destroy the natural ecosystem of the river, and the river water loses its self-purification. capacity, water quality deterioration is accelerating; the third material has slightly less impact on the natural ecosystem than the first two, but it adds a layer of refractory foreign matter in the river, which is not in harmony with the natural river. At the same time, once it is washed by floods, it may be destroyed. The fourth material, clay layer, has a good ecological effect for anti-seepage, but it has the disadvantage of weak erosion resistance in sand and gravel river courses in mountainous areas, and there is also a shortage of clay resources in some areas.

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