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A Calculation Method and Application of Average Flow Velocity in Debris Flow Section

A technology of average flow velocity and debris flow, applied in fluid velocity measurement, special data processing application, velocity/acceleration/shock measurement, etc., can solve problems such as not considering the influence of viscosity coefficient flow velocity, and achieve the effect of accurate average flow velocity

Active Publication Date: 2018-06-05
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All the empirical formulas are based on the Manning formula in hydraulics, but they do not consider the influence of the viscosity coefficient on the flow rate

Method used

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  • A Calculation Method and Application of Average Flow Velocity in Debris Flow Section
  • A Calculation Method and Application of Average Flow Velocity in Debris Flow Section
  • A Calculation Method and Application of Average Flow Velocity in Debris Flow Section

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Embodiment 1

[0040] A debris flow ditch is located on the left bank of the Mianyuan River, with a drainage area of ​​about 1.36km. 2, the topography of the upper reaches of the main ditch is steep, the highest point is located on the east side of the basin, with an altitude of 1987m; the lowest point is located near the Mianyuan River at the mouth of the Goukou, with an altitude of 810m and a relative height difference of 1177m; the length of the main ditch of the debris flow ditch is 2.59km, the longitudinal slope of the ditch bed The ratio dropped by 412‰. The watershed is in the shape of a peach leaf in plan, which is conducive to the confluence of mud-rock fluids. After the earthquake, multiple debris flows occurred, and the channel was seriously cut down, with a cutting depth of about 30m. The channel shape was "V"-shaped, with an average width of about 3-5m. Steep topographical conditions provide favorable conditions for the collection of rainstorms and floods, while better air-side...

Embodiment 2

[0048] A debris flow ditch is located in the north of Qingpingchang Town in the northwestern mountainous area of ​​Mianzhu City, Sichuan Province. It belongs to a ditch on the left bank of the Mianyuan River in the upper reaches of the Tuojiang River in the Yangtze River Basin. The coordinates of the mouth of the ditch are N31.5° and E104.1°. In terms of landforms, it belongs to tectonic erosion in cutting steep low-medium mountain landforms, slope gully landforms. The basin generally stretches from east to west, with a catchment area of ​​7.81km 2 The total length of the main ditch is 3.25km. The lowest point in the basin is located at the mouth of Mizogu, which is 883m above sea level. Multiple large-scale debris flows have occurred in this ditch, posing a great threat to Qingping Township.

[0049] Utilize the method for measuring the average flow velocity of the debris flow section of the present invention to measure the flow velocity of the debris flow under the natural ...

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Abstract

The invention discloses a method for measuring and calculating the average flow velocity of a mud-rock flow section and its application. The calculation method uses means such as on-site investigation and measurement, actual sampling and measured bulk density, and indoor rheological experiments to determine the bulk density of debris flow fluid, the bulk density of debris flow solid matter, the slope of debris flow channels or drainage channels, the hydraulic radius of debris flow flow sections, and the debris flow ditch. The parameters such as the external roughness of the channel or the drainage channel, and the viscosity coefficient of the debris flow are substituted into the calculation formula of the average flow velocity of the debris flow section, so as to obtain a more accurate average flow velocity of the debris flow section. This method comprehensively considers 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. Field survey and actual engineering design needs.

Description

technical field [0001] The invention relates to a method for measuring the average flow velocity of a debris flow section, and its application in the condition of a debris flow natural channel or in the rationality checking of the design of debris flow drainage channels. Background technique [0002] Debris flow is a common geological disaster in mountainous areas of China, with the characteristics of sudden occurrence, short duration, ferocious onset, large erosion and deposition, and extremely strong destructive power. In recent years, under the disturbance of increasing seismic activity and the significant increase in extreme weather caused by global climate change, debris flow activities have been very active, major debris flow disasters have occurred frequently, and the safety of people's lives and properties has been seriously endangered and threatened. In order to ensure the sustainable development of the mountain economy, it is very necessary to prevent and control t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01P5/00
Inventor 陈剑刚陈晓清游勇赵万玉于献彬李云李昆
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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