Method for quantifying river bank soil erosion parameter by considering influence of root system of tamarix ramosissima

Abstract

The invention discloses a method for quantifying river bank soil erosion parameter by considering influence of root system of tamarix ramosissima. The method comprises the steps of: the step 1, taking a glass water tank as a test tank, and arranging a test section with a trapezoidal section in the glass water tank; the step 2, performing an erosion test without covering of a tamarix ramosissima root system, and fitting a numerical relationship between a starting shear stress and an erosion coefficient; the step 3, performing an erosion test with covering of the tamarix ramosissima root system in the test section to obtain a numerical relationship between the starting shear stress and the root system density and the dry density and the numerical relationship between the erosion coefficient and the root system density and the dry density under different tamarix ramosissima root placing modes; the step 4, calculating the starting shear stress of the section according to the numerical relationship between the starting shear stress and the root system density and the dry density; and the step 5, calculating the erosion coefficient of the section according to the erosion coefficient and the numerical relationship between the root system density and the dry density. The influence of the root system of the tamarix ramosissima is introduced into the quantification of the soil erosion parameters of the river bank, so that more accurate quantification indexes can be obtained.

Description

technical field [0001] The invention belongs to the technical field of quantification of scouring parameters of river bank soil, and in particular relates to a quantification method of scouring parameters of river bank soil considering the influence of tamarisk root system. Background technique [0002] Under the action of water flow, the soil is easily scoured, especially on river banks, lake banks and other bank slopes. In the Tarim River Basin in Xinjiang, the typical desert vegetation with red willow as the main body is decreasing, and the erosion of the coastal soil is relatively serious. Through field investigation and research, it is found that the riverbank soil with vegetation root system is not easy to be washed by water. Vegetation roots interpenetrate and entangle the soil, which enhances the anti-shock ability of the soil, weakens the degree of dispersion between soil particles, and makes it difficult for the soil to start under the action of water flow. The ma...

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Problems solved by technology

However, there is no specific quantitative index of the starting shear stress and erosion coefficient of the river bank soil under the joint action of the vegetation root system and the soil, nor does it consider the influence of the tamarisk root system on the river bank erosion parameters.

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