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Soil layer thickness estimation method based on landform parameters

A technology of soil layer thickness and parameters, applied in the field of soil geological survey, can solve the problems of poor spatial continuity, rough results, and inability to complete accurate on-the-spot measurement in a large range, and achieve the effect of strong versatility

Active Publication Date: 2021-05-14
北京理工大学重庆创新中心 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the research area is on a regional scale, due to reasons such as time, labor, and equipment costs, it is impossible to complete a large-scale on-site accurate measurement, so it is necessary to use scientific estimation methods to obtain a map of soil layer thickness in the entire area for use as a complex environmental model input parameters for
At present, there are mainly two types of methods for thickness estimation on the regional scale: one is to directly approximate the soil layer thickness to the surface shape parameters (elevation, slope or curvature). Areas with lower requirements; the second is to establish a relationship model between soil layer thickness and environmental marker factors. The environmental marker factors are elevation, slope, curvature, stratum lithology, specific catchment area, topographic humidity index, runoff directly extracted from digital elevation Intensity index, etc., the soil thickness estimation distribution map under this method has the problems of poor spatial continuity and large errors in numerical values

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  • Soil layer thickness estimation method based on landform parameters
  • Soil layer thickness estimation method based on landform parameters
  • Soil layer thickness estimation method based on landform parameters

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Embodiment 1

[0033] This embodiment discloses a soil layer thickness estimation method based on geomorphic parameters, which is applied to the accumulation layer geomorphology of the Three Gorges reservoir area. The method includes the following steps:

[0034] A. Steps for calculating the first parameter C: The parameter C represents the contribution of the profile curvature c to the thickness of the soil layer.

[0035] Obtain the profile curvature c of all grid points in the study area through GIS (Geographic Information System); set a ratio so that the profile curvature c of the points within the ratio is between (-x, x); for each grid Point to set the first parameter C:

[0036] For points whose profile curvature c is greater than x, set its first parameter C to 0; for points whose profile curvature is less than -x, set its first parameter C to 1; the first parameters of other points are (x-c) / 2x .

[0037]

[0038] Obviously, for different research areas, the value of x is diffe...

Embodiment 2

[0048]This embodiment discloses a method for estimating soil layer thickness based on geomorphic parameters, which is applied to the accumulation layer geomorphology of the Three Gorges Reservoir area. The method involves three parameters, namely the first parameter C, the second parameter S and the third parameter P. There is a nonlinear functional relationship between the thickness value T of the sample points in the study area and the three parameters C, S, and P (T=f(C, S, P)). In this embodiment, the random forest machine learning model is used to train and build the sample points. model, and then use the trained model to predict the thickness value of the entire study area. The calculation method of the three parameters is as follows:

[0049] 1. Calculation method of the first parameter C

[0050] The first parameter C represents the contribution of the section curvature c to the thickness of the soil layer. First, through field investigation and geological understand...

Embodiment 3

[0058] This embodiment discloses a soil layer thickness estimation system based on geomorphic parameters, including a first calculation unit, a second calculation unit, a third calculation unit and a machine learning model.

[0059] The first calculation unit, the first unit is configured with a geographic information system and a first configuration module, the first calculation unit obtains the profile curvature c of all grid points in the research area through the geographic information system; the first configuration The module is used to configure the proportion; the first calculation unit calculates x and -x according to the proportion configured by the first configuration unit, and constructs a calculation formula for the first parameter C:

[0060]

[0061] The corresponding first parameter C can be obtained by inputting the section curvature c of the point to be evaluated into the first calculation unit.

[0062] A second calculation unit, the second calculation un...

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Abstract

The invention discloses a soil layer thickness estimation method based on landform parameters, and belongs to the field of soil geological survey. The method comprises the following steps: acquiring a first parameter of a research area by utilizing a grid point section curvature distribution condition of the research area, calculating a second parameter of each sub-area by utilizing a gradient distribution condition of the research area and a critical gradient and an internal friction angle of each sub-area, and fitting a third parameter function by utilizing a projection condition of a relative position of each sample point of the research area; training the first parameter, the second parameter, the third parameter and the thickness value of the sample point, respectively calculating the first parameter, the second parameter and the third parameter through the section curvature, the subordinate sub-region and the relative position of the to-be-evaluated point, inputting the first parameter, the second parameter and the third parameter into the trained model, and predicting the thickness value of the to-be-evaluated point. According to the method, the regional slope evolution history and the existing surface form information are integrated, and the problem that precision and universality are not compatible in a previous estimation method can be solved to a certain extent.

Description

technical field [0001] The invention relates to the field of soil geological survey, in particular to a soil layer thickness estimation method based on geomorphic parameters. Background technique [0002] Soil thickness is an important parameter in many geological environmental studies, such as slope stability, slope hydrology, local effects of earthquakes, topographic evolution, soil water distribution, heat flux distribution, and soil protection. When the research area is small, accurate measurement of soil layer thickness at multiple sample points by direct or indirect measurement methods can meet the accuracy requirements of the research area. When the research area is on a regional scale, due to reasons such as time, labor, and equipment costs, it is impossible to complete a large-scale on-site accurate measurement, so it is necessary to use scientific estimation methods to obtain a map of soil layer thickness in the entire area for use as a complex environmental model ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/60G06T17/05
CPCG06T7/60G06T17/05G06T2207/10012Y02A10/40
Inventor 肖婷田卫明邓云开
Owner 北京理工大学重庆创新中心