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Method for measuring and calculating average flow velocity at cross section of viscous debris flow

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

Active Publication Date: 2017-09-19
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for measuring and calculating average flow velocity at cross section of viscous debris flow
  • Method for measuring and calculating average flow velocity at cross section of viscous debris flow
  • Method for measuring and calculating average flow velocity at cross section of viscous debris flow

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Embodiment 1

[0027] Such as figure 1 As shown, the method of the present invention is used to measure the primary debris flow velocity of a debris flow branch in Xiaojiang, an upstream tributary of the Jinsha River.

[0028] A debris flow ditch is a debris flow branch 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. The two sides of the gully bank are dominated by phyllite and slate. The strong weathering has caused a large number of loose deposits such as shallow landslides and collapses in the area, providing a large amount of material sources for the formation of debris flows. In order to prevent and control the 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 the channel.

[0029] Set the measurement section ...

Embodiment 2

[0037] Such as figure 2 As shown, the method of the present invention is used to measure the primary debris flow velocity of a debris flow branch in the upper reaches of the Dadu River.

[0038] The drainage area of ​​this debris flow branch is 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 steep slope, steep terrain, and severe weathering provide powerful conditions for the formation of debris flows. Debris flows often break out in this ditch, and the scale is large, threatening the safety of people downstream. In order to prevent and control the 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 the channel.

[0039] Set the measurement section at any relatively straight position in the trench, and the measurement section diagram is as follows figure 2 . Through the measurement an...

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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 section of a debris flow, belonging to the field of measurement technology and mountain disaster prevention. Background technique [0002] The velocity of debris flow is one of the core research contents of debris flow movement mechanics, and it is the key to studying the rheological properties and movement mechanism of debris flow. In actual engineering, the flow velocity of debris flow, especially the average flow velocity of debris flow section is an important basic parameter for the design of prevention and control engineering. [0003] The Chinese invention patent application with publication number CN104794362A discloses a method and application for measuring and calculating the average flow velocity of a debris flow section. This method uses methods such as field survey and mea...

Claims

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Application Information

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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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