Calculation Method of Average Flow Velocity in Section of Viscous Debris Flow

A technology of average flow velocity and debris flow, applied in fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc., can solve the problems of difficulty in comprehensive roughness coefficient of debris flow, affecting the accuracy of measurement and not considering the influence of flow velocity, etc. The effect of high engineering practical value, refined physical meaning and simple calculation

Active Publication Date: 2019-06-14
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not reflect the influence of other important related factors (such as the particle composition of debris flow, the volume ratio of debris flow and sediment content, etc.) , Debris flows (especially viscous debris flows) mostly move in arrays, and the bed is made along the way. The exchange, collision, deposition and other processes of debris flow particles make it difficult to accurately determine the comprehensive roughness coefficient of debris flows through table lookup or investigation, thus affecting the accuracy of measurement

Method used

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  • Calculation Method of Average Flow Velocity in Section of Viscous Debris Flow
  • Calculation Method of Average Flow Velocity in Section of Viscous Debris Flow
  • Calculation Method of Average Flow Velocity in Section of Viscous Debris Flow

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Embodiment 1

[0026] Such as figure 1 Shown, measure and calculate the primary debris flow velocity of a debris flow tributary ditch of Xiaojiang, a tributary of the upper reaches of the Jinsha River, with the method of the present invention.

[0027] A debris flow ditch is a debris flow tributary of Xiaojiang, a tributary of the upper reaches of the Jinsha River, with a drainage area of ​​48km 2 , the main ditch is 14km long, the highest point of the basin is 3230m above sea level, and the lowest point is 1040m above sea level. Both sides of the ditch bank are dominated by phyllite and slate, and strong weathering has resulted in a large number of loose deposits such as shallow landslides and collapses in this area, providing a large number of sources for the formation of debris flows. In order to prevent and control this debris flow ditch, it is necessary to build a blocking project upstream, and it is necessary to calculate the average velocity of the debris flow in this ditch.

[0028...

Embodiment 2

[0036] Such as figure 2 As shown, measure and calculate the primary debris flow velocity of a debris flow tributary ditch in the upper reaches of the Dadu River with the method of the present invention.

[0037] The tributary ditch of the debris flow covers an area of ​​8.6km 2 , the main ditch is 6.3km long, the highest point of the basin is 3655m above sea level, and the lowest point is 2705m above sea level. The large slope, steep terrain and severe weathering provide favorable conditions for the formation of debris flows. Debris flows often break out in the ditch, and the scale is large, threatening the safety of people downstream. In order to prevent and control this debris flow ditch, it is necessary to build a blocking project upstream, and it is necessary to calculate the average velocity of the debris flow in this ditch.

[0038] Set the measurement section at any relatively straight position in the ditch, and the measurement section diagram is as follows: figure ...

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Abstract

The invention discloses a method for measuring and calculating the flow velocity of a viscous debris flow. In allusion to defects existing in the prior art that influences imposed on the roughness coefficient, the flow velocity coefficient and the debris flow velocity by grain composition of the debris flow, the ratio of debris flow volume to sand content and the like are not considered and some variables are difficult to be accurately determined through table look-up or investigation, the invention provides a method for calculating the average flow velocity at the cross section of the debris flow with influences imposed on the flow velocity by the grain composition of the debris flow being sufficiently considered. According to the method, grain composition parameters (mu, Dc) are introduced into measurement and calculation for the flow velocity of the debris flow, dual influences imposed for the flow velocity of the debris flow by the ratio of debris flow volume to sand content are sufficiently considered, the influences imposed on the flow velocity of the debris flow by the ratio of debris flow volume to sand content are comprehensively represented by adopting Sv(1-Sv), and finally a formula model of v=f(exp(mu), H / Dc, Sv(1-Sv), H, J) for the flow velocity of the viscous debris flow can be acquired by taking a Manning formula as a prototype. The method disclosed by the invention is reliable in principle, scientific, simple and convenient in calculation process, high in precision of a measurement and calculation result and applicable to requirements of the engineering field.

Description

technical field [0001] The invention relates to a method for measuring and calculating the velocity of a debris flow, in particular to a method for measuring and calculating the average velocity of a debris flow section, and belongs to the fields of measurement technology and mountain disaster prevention and control. Background technique [0002] Debris flow velocity is one of the core research contents of debris flow mechanics, and is the key to study the rheological properties and movement mechanism of debris flow. In actual engineering, the flow velocity of debris flow, especially the average flow velocity measurement of debris flow section is an important basic parameter for prevention and control engineering design. [0003] The Chinese invention patent application with the publication number CN104794362A discloses a method for measuring and calculating the average flow velocity of a debris flow section and its application. This method determines the bulk density of de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/00
CPCG01P5/00
Inventor 游勇刘道川李泳柳金峰王保亮孙昊
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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