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A critical concentration-based debris flow initiation model and application thereof

A critical concentration and debris flow technology, applied in data processing applications, special data processing applications, instruments, etc., can solve the problems of subjectivity errors in evaluation results, inability to effectively cover rainfall, etc., and achieve the effect of easy parameter acquisition and simple calculation process

Inactive Publication Date: 2017-09-15
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing technologies represented by the above patent documents all have the defect that rainfall data monitoring cannot effectively cover the rainfall in the complex environment of mountainous areas, which leads to subjectivity and even errors in the evaluation results

Method used

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  • A critical concentration-based debris flow initiation model and application thereof
  • A critical concentration-based debris flow initiation model and application thereof
  • A critical concentration-based debris flow initiation model and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A debris flow initiation model based on critical concentration, including the following steps:

[0048] a. Obtain the slope θ of the starting area through digital elevation model calculation, and obtain the friction angle φ and soil density ρ in the soil through field tests s , using the product of the surface area of ​​the debris flow starting zone and the average thickness of the starting layer to quickly estimate the solid matter volume in the starting zone;

[0049] b. Obtain the water body density ρ of the debris flow basin by actually investigating the existing provenance conditions in the debris flow basin w , calculate the instability critical volume concentration C by formula 1 c ;

[0050]

[0051] c. Obtain the initial solid volume concentration C through field tests * and porosity, calculate the solid matter volume V in the loose layer of the stack s , according to formula 2 to calculate the volume of water body V required for the start-up of solid lo...

Embodiment 2

[0059] A debris flow initiation model based on critical concentration, including the following steps:

[0060] a. Obtain the slope θ of the starting area through digital elevation model calculation, and obtain the friction angle φ and soil density ρ in the soil through field tests s , using the product of the surface area of ​​the debris flow starting zone and the average thickness of the starting layer to quickly estimate the solid matter volume in the starting zone;

[0061] b. Obtain the water body density ρ of the debris flow basin by actually investigating the existing provenance conditions in the debris flow basin w , calculate the instability critical volume concentration C by formula 1 c ;

[0062]

[0063] c. Obtain the initial solid volume concentration C through field tests * and porosity, calculate the solid matter volume V in the loose layer of the stack s , according to formula 2 to calculate the volume of water body V required for the start-up of solid lo...

Embodiment 3

[0078] A debris flow initiation model based on critical concentration, including the following steps:

[0079] a. Obtain the slope θ of the starting area through digital elevation model calculation, and obtain the friction angle φ and soil density ρ in the soil through field tests s , using the product of the surface area of ​​the debris flow starting zone and the average thickness of the starting layer to quickly estimate the solid matter volume in the starting zone;

[0080] b. Obtain the water body density ρ of the debris flow basin by actually investigating the existing provenance conditions in the debris flow basin w , calculate the instability critical volume concentration C by formula 1 c ;

[0081]

[0082] c. Obtain the initial solid volume concentration C through field tests * and porosity, calculate the solid matter volume V in the loose layer of the stack s , according to formula 2 to calculate the volume of water body V required for the start-up of solid lo...

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Abstract

The invention provides a critical concentration-based debris flow initiation model. The method comprises the steps of: a, acquiring the gradient theta of an initiation area, the friction angle phi in a soil body, and the density rho s of the soil body and estimating the volume quantity of solid matter in the initiation area; b, acquiring the water body density rho w of a catchment basin of debris flow and calculating an instability critical volume concentration Cc; c, acquiring the initial solid volume concentration C* and porosity, calculating the volume Vs of solid matter in an unconsolidated formation of an accumulation body, and calculating the water body volume Vw required for initiation of the solid unconsolidated matter; d, calculating the surface area A of a slip mass of the initiation area, calculating the upstream conflux area and acquiring the overland runoff forming time Tp; e, calculating the total water quantity Vw', and comparing the total water quantity with the water body volume Vw required for initiation of the solid unconsolidated matter, wherein the danger of initiation of debris flow exists if Vw' is close to Vw. According to the invention, a rainfall process is not considered and threshold value control can be performed on a rainfall result only by determining cross sectional flow.

Description

technical field [0001] The invention relates to the technical field of geological disaster prevention and control engineering, in particular to a debris flow starting model based on critical concentration and its application. Background technique [0002] Debris flow, as a two-phase fluid between water flow and debris flow, acts quickly and strongly on mountainous areas due to its fast velocity, strong impact, and sudden outbreak. The main manifestations will seriously endanger the safety of residents, towns, transportation, water conservancy, and electric facilities in the disaster area for a long period of time in the future, and it is one of the important restrictive factors affecting post-disaster recovery and reconstruction. It is very necessary to effectively predict the outbreak of debris flow. [0003] In terms of specific research methods, early warning of debris flows can be divided into empirical statistical models and physical models. The former mainly uses the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/26
CPCG06F30/20G06Q50/265
Inventor 唐川黄勋龚凌枫周伟朱静常鸣李为乐
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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