Northwest desert region riverway ecological restoration system based on alternate distributary and subsurface irrigation and construction method

Abstract

The invention provides a northwest desert region riverway ecological restoration system based on alternate distributary and subsurface irrigation. The system comprises an ecological engineering systemand an alternate distributary and subsurface irrigation system. A method comprises the steps that Step 1, an alternate distributary and subsurface irrigation system is constructed; Step 2, a test area an ecological restoration system is constructed; and Step 3, the ecological restoration system is corrected based on feedbacks on alternate distributary and subsurface irrigation effect; a 'gate-dike-dam-pump' ecological engineering measure in a drainage basin is combined with a planar water delivery mode of a natural gully and a distributary, a new irrigation concept and an irrigation mode of vegetation are innovatively proposed, water resources are used for protecting the vegetation to the maximum extent, and the ecological restoration effect of a riverway in a northwest desert region is greatly improved; the method has the characteristics of being distinct in originality, advanced in theoretical technology, remarkable in practical effect and huge in popularization value.

Description

technical field [0001] The invention belongs to the technical field of restoration of the river channel ecosystem in the desert area of ​​northwest China, and in particular relates to a river channel ecological restoration system and construction method in the desert area of ​​northwest China based on branch infiltration and wheel irrigation. New concept, new technology, new system and construction method of ecological restoration system of inland river channel protective vegetation branch infiltration and rotation irrigation in cold and arid desert area. Background technique [0002] The inland river in the arid area of ​​Northwest my country is an ecologically fragile area under national key protection and the core area of ​​my country's "Silk Road" economic belt construction. The precipitation is scarce and the evaporation is strong. For example, the average annual evaporation in Tarim and Hexi Corridor is above 1800mm . In the past 50 years, under the influence of high-i...

AI Technical Summary

Problems solved by technology

The study found that the current ecological water delivery of the Tarim River only uses the main channel to deliver water, and the groundwater influence width is only 1.2km. Most of the areas cannot be effectively irrigated, which seriously threatens the gestation, germination and growth of terrestrial vegetation, and is not conducive to the restoration and restoration of vegetation in areas far away from the main river.

like figure 2 As shown, the buried depth of groundwater has a significant impact on the growth of Populus euphratica; in addition, the research shows that the ecological water leaves the irrigation area too early and too fast during the ecological water transfer process, and about 40% of the discharged water returns to the main stream and flows into the downstream lakes Evaporation losses, wasting limited and precious water resources

On the other hand, the irrigation of vegetation in the main stream of the Tahe River is mainly based on "flood irrigation" and "flood irrigation". Many ecological channels have been abandoned due to the elevation of the water level in front of the sluice due to sedimentation.

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