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Debris flow average speed calculating method and application thereof

A technology of average flow velocity and debris flow, applied in calculation, special data processing applications, instruments, etc., can solve the problems of difficult calculation, many parameters, unsuitable for actual calculation, etc., and achieve high calculation accuracy, good universality, high Effect of Disaster Preparedness Suitability

Active Publication Date: 2017-09-29
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The calculation method and application of the average flow velocity of the debris flow section disclosed in this patent document comprehensively consider the external roughness change caused by the shape change of the debris flow channel or drainage channel and the internal roughness caused by the fluid properties of the debris flow, and can reasonably determine the average flow velocity of the debris flow section , however, the entire calculation method involves many parameters, and the calculation is difficult, so it is not suitable for large-scale actual calculations in the field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for calculating the average flow velocity of debris flow, comprising the following steps:

[0033] a. On-site investigation to determine the yield stress τ of debris flow 0 , unit Pa;

[0034] b. On-site measurement of debris flow bulk density ρ, unit kg / m 3 ;

[0035] c. On-site measurement of debris flow depth h, unit m;

[0036] d. Calculate the dimensionless yield stress τ through formula 1;

[0037] τ = τ 0 / (ρgh) (Equation 1)

[0038] Among them, g is the acceleration due to gravity, g=9.8m / s 2 ;

[0039] e. On-site measurement of the surface velocity Vs of the debris flow, in m / s;

[0040] f. On-site measurement of the bed roughness n of debris flow movement;

[0041] g. Calculate the average flow velocity Vm of the debris flow through formula 2, the unit is m / s;

[0042] Vs / Vm=(18.63n 2 -3.53n+0.6)τ -0.07 (Formula 2).

[0043] "a. On-site investigation to determine the yield stress τ of debris flow 0; b, on-site measurement of debris flow...

Embodiment 2

[0045] A method for calculating the average flow velocity of debris flow, comprising the following steps:

[0046] a. On-site investigation to determine the yield stress τ of debris flow 0 , unit Pa;

[0047] b. On-site measurement of debris flow bulk density ρ, unit kg / m 3 ;

[0048] c. On-site measurement of debris flow depth h, unit m;

[0049] d. Calculate the dimensionless yield stress τ through formula 1;

[0050] τ = τ 0 / (ρgh) (Equation 1)

[0051] Among them, g is the acceleration due to gravity, g=9.8m / s 2 ;

[0052] e. On-site measurement of the surface velocity Vs of the debris flow, in m / s;

[0053] f. On-site measurement of the bed roughness n of debris flow movement;

[0054] g. Calculate the average flow velocity Vm of the debris flow through formula 2, the unit is m / s;

[0055] Vs / Vm=(18.63n 2 -3.53n+0.6)τ -0.07 (Formula 2).

[0056] In the step f, the value range of the bed roughness n of the debris flow movement is 0.02.

Embodiment 3

[0058] A method for calculating the average flow velocity of debris flow, comprising the following steps:

[0059] a. On-site investigation to determine the yield stress τ of debris flow 0 , unit Pa;

[0060] b. On-site measurement of debris flow bulk density ρ, unit kg / m 3 ;

[0061] c. On-site measurement of debris flow depth h, unit m;

[0062] d. Calculate the dimensionless yield stress τ through formula 1;

[0063] τ = τ 0 / (ρgh) (Equation 1)

[0064] Among them, g is the acceleration due to gravity, g=9.8m / s 2 ;

[0065] e. On-site measurement of the surface velocity Vs of the debris flow, in m / s;

[0066] f. On-site measurement of the bed roughness n of debris flow movement;

[0067] g. Calculate the average flow velocity Vm of the debris flow through formula 2, the unit is m / s;

[0068] Vs / Vm=(18.63n 2 -3.53n+0.6)τ -0.07 (Formula 2).

[0069] In the step f, the value range of the bed roughness n of the debris flow movement is 0.04.

[0070] The calculati...

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PUM

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Abstract

The invention discloses a debris flow average speed calculating method and application thereof and belongs to the field of debris flow control engineering. The debris flow average speed calculating method is characterized by comprising the following steps of a, determining debris flow yield stress of tau 0 through field investigation; b, field-measuring debris flow volume weight of rho; C, field-measuring debris flow depth of h; d, calculating non-dimensionalized yield stress of tau through a formula 1; e, field-measuring debris flow surface speed of Vs; f, field-measuring bed roughness of n of debris flow movement; g, calculating debris flow average speed of Vm through a formula 2. The debris flow average speed calculating method takes into full consideration the bed roughness of debris flow movement, the depth and the properties of debris flow, eliminates size effects through non-dimensionalization, facilitates deduction to practical debris flow and has the advantages of being convenient in calculate and high in calculating accuracy. The debris flow average speed calculating method is applicable to large-dimension field practical calculation and can provide crucial reference for assessment and control of debris flow.

Description

technical field [0001] The invention relates to the field of mud-rock flow prevention and control engineering, in particular to a method for calculating the average velocity of mud-rock flow and its application. Background technique [0002] The speed of movement of debris flow is one of the most important parameters of debris flow, and it is an important parameter for evaluating debris flow and preventing debris flow disasters. The movement speed of debris flow generally includes the average flow velocity and surface velocity of debris flow. The average flow velocity of debris flow is the main characteristic velocity representing the velocity of debris flow. The peak flow of debris flow, one of the two important parameters for evaluating and preventing debris flow, is calculated from the average flow velocity of debris flow. However, it is difficult to observe the average flow velocity of debris flow in field conditions; on the contrary, the surface velocity of debris flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 余斌禹磊刘清华
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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