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Estimation method of slope roughness and silt erosion rate under rainfall condition

A technology of erosion rate and slope surface, which is applied in the direction of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., can solve the problems such as difficult to accurately determine slope surface roughness and sediment erosion rate

Active Publication Date: 2019-12-13
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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  • Estimation method of slope roughness and silt erosion rate under rainfall condition
  • Estimation method of slope roughness and silt erosion rate under rainfall condition
  • Estimation method of slope roughness and silt erosion rate under rainfall condition

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Embodiment Construction

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

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

[0091] Step 1, establish the infiltration model under the rainfall condition according to Green-Ampt model and Philip infiltration model, described infiltration model comprises soil infiltration rate ...

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Abstract

The invention discloses an estimation method of a slope roughness factor and a silt erosion rate under the rainfall condition. The method comprises the following steps of firstly building an infiltration model under the rainfall condition to obtain the accumulated infiltration quantity in the rainfall process; then, building a kinematic wave equation; obtaining the rope roughness and the slope water depth by combining with the balance relationship of the accumulated infiltration quantity, the kinematic wave equation and the water quantity; then, building a silt conveying equation; and determining the silt erosion rate according to practically measured rainfall data and the slope water depth. Under the condition of the time of once rainfall, the unit time flow rate and silt quantity in a position of a flow outlet are measured; the slope roughness factor and the silt erosion rate can be obtained by combining with the relationship between the flow rate and the water depth and the relationship among the rain intensity, the water depth and the silt generating quantity; a parameter obtaining method of the infiltration process is simplified; and the general applicability of the estimationresult is improved.

Description

technical field [0001] The invention belongs to the technical field of methods for analyzing slope surface characteristics under rainfall conditions through hydrological processes, and relates to a method for estimating slope surface roughness and sediment erosion rate under rainfall conditions. Background technique [0002] Under rainfall conditions, farmland surface water on sloping farmland mainly moves in the form of infiltration and slope runoff. In the early stage of rainfall, the impact of raindrops usually makes the surface soil particles fall off, so that the 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 mode, and surface micro-topography will all affect the movement of slope water flow, thereby affecting the amount of sediment carried by runoff. Usually, the movement process of slope water flow is described by Saint-Venant's equation and kinetic wave eq...

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Application Information

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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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