Method for preventing water and soil loss through influence of populus euphratica root system on riverbank soil body lateral scouring

Abstract

The invention belongs to the technical field of riverbank soil body lateral scouring parameter quantification, and discloses a method for preventing water and soil loss through the influence of a populus euphratica root system on the riverbank soil body lateral scouring. The method comprises the steps of selecting the populus euphratica root system along the bank of the Tarim river, and arrangingthe populus euphratica root system in a soil body to form a root-soil composite bank slope soil body; performing an anti-impact characteristic test on the obtained root-soil composite bank slope soilbody to obtain the anti-impact characteristic indexes of the soil body under different root system characteristics; and according to the change rule of the starting shear stress and the scouring coefficient under the influence of the populus euphratica root system, obtaining a quantitative relation between the river bank soil body starting shear stress and the root system volume density and the soil body dry density under the influence of the root system and a quantitative relation between the scouring coefficient and the root system volume density and the soil body dry density. According to the present invention, the influence rule of a typical desert vegetation root system on the river bank soil body impact resistance is analyzed, the quantitative relation is determined, the calculationformula of the starting shear stress and the scouring coefficient of the river bank soil body under the influence of the root systems is given, and the theoretical reference is provided for the riverbank lateral scouring.

Description

technical field [0001] The invention belongs to the technical field of quantification of lateral scouring parameters of river bank soil, and in particular relates to a method for preventing water and soil loss by affecting the lateral scouring of river bank soil by the root system of Populus euphratica. Background technique [0002] At present, under the action of water flow, the soil is easily scoured, especially the lateral erosion of the bank slopes such as river banks and lake banks is more serious. According to data, about 60 billion tons of soil are scoured by water every year. According to Nanson, the lateral deformation of the river bed is caused by the erosion of the river bank soil by the water flow, and the anti-scour capacity of the river bank soil reflects the degree of lateral deformation of the river bank. Some scholars have proposed that the clay content of riverbank soil is an important factor affecting the anti-scourability of riverbank soil. Briaud condu...

AI Technical Summary

Problems solved by technology

[0006] (1) Existing research only discusses the factors affecting the anti-scourability of riverbank soil by vegetation root system, and does not involve specific quantitative indicators and quantitative relationships

[0007] (2) Existing studies have not provided specific quantitative indicators of the starting shear stress and scour coefficient of the river bank soil under the joint action of the vegetation root system and the soil, nor have they involved the research on the influence of the root system on the river bank scour parameters

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