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A Method for Estimating Slope Roughness and Sediment Erosion Rate under Rainfall Conditions

A technology of erosion rate and condition, applied in the direction of permeability/surface area analysis, suspension and porous material analysis, soil material test, etc., can solve the problems such as difficult to accurately determine slope surface roughness and sediment erosion rate, and achieve improvement Universal applicability, the effect of simplifying the parameter acquisition method

Active Publication Date: 2022-03-29
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for estimating slope surface roughness and sediment erosion rate under rainfall conditions, which solves the problem that existing models are difficult to accurately determine slope surface roughness and sediment erosion rate

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  • A Method for Estimating Slope Roughness and Sediment Erosion Rate under Rainfall Conditions
  • A Method for Estimating Slope Roughness and Sediment Erosion Rate under Rainfall Conditions
  • A Method for Estimating Slope Roughness and Sediment Erosion Rate under Rainfall Conditions

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Embodiment Construction

[0089] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0090] The present invention is a method for estimating slope roughness and sediment erosion rate under rainfall conditions, such as figure 1 As shown, first establish the infiltration model under rainfall conditions, and obtain the cumulative infiltration amount during the rainfall process; then establish the kinematic wave equation, and combine the cumulative infiltration amount and the kinematic wave equation to obtain the slope roughness and the slope water depth; Then the sediment transport equation is established, and the sediment erosion rate is determined according to the measured rainfall data and the water depth of the slope.

[0091] Step 1. Establish an infiltration model under rainfall conditions according to the Green-Ampt model and the Philip infiltration model. The infiltration model includes soil infiltration rate i and cumulat...

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Abstract

The invention discloses a method for estimating slope surface roughness and sediment erosion rate under rainfall conditions, comprising: first establishing an infiltration model under rainfall conditions to obtain cumulative infiltration during the rainfall process; and then establishing a motion wave equation , combined with the cumulative infiltration, kinetic wave equation and water balance relationship to obtain the slope surface roughness and slope water depth; then establish the sediment transport equation, and determine the sediment erosion rate according to the measured rainfall data and slope water depth. Under a rainfall time, measure the flow rate and sediment volume per unit time at the outlet, and combine the relationship between flow velocity and water depth, as well as the relationship between rain intensity, water depth and sediment yield, to obtain the slope surface roughness and sediment yield. The erosion rate simplifies the parameter acquisition method of the infiltration process and improves the general applicability of the estimation results.

Description

technical field [0001] The invention belongs to the technical field of methods for analyzing slope surface characteristics under rainfall conditions by hydrological process, and relates to a method for estimating slope roughness and sediment erosion rate under rainfall conditions. Background technique [0002] Under rainfall conditions, the surface water of farmland on slope farmland mainly moves in the form of infiltration and slope runoff. In the early stage of rainfall, the impact of raindrops usually causes the surface soil particles to fall off, so that slope runoff often carries a large amount of sediment. At the same time, factors such as soil texture, soil infiltration capacity, rainfall intensity, land use patterns, and surface micro-topography all affect the movement of slope water flow, which in turn affects the amount of sediment carried by runoff. Usually, the flow process of the slope surface is described by the Saint-Venant equation and the kinematic wave equa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24G01N15/08
CPCG01N33/24G01N15/08
Inventor 吴军虎邵凡凡
Owner XIAN UNIV OF TECH
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