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Calculation method for debris flow section mean flow rate and application

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

Active Publication Date: 2015-07-22
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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  • Calculation method for debris flow section mean flow rate and application
  • Calculation method for debris flow section mean flow rate and application
  • Calculation method for debris flow section mean flow rate and application

Examples

Experimental program
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Effect test

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 terrain 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 ditch, with an altitude of 810m, and a relative height difference of 1177m; The gradient is 412‰. The plane shape of the basin is peach-leaf-shaped, which is conducive to the confluence of mud-rock fluids. After the earthquake, many debris flows occurred, and the trench was severely cut down, with a cutting depth of about 30m. The trench was in a "V" shape with an average width of about 3-5m. The steep topographical conditions provide good conditions for the accumulation of rainstorms and floods, while the better air conditions provide favorable conditions for the development of unfavorable geological phenomena in the gully area and the accum...

Embodiment 2

[0048] A debris flow ditch is located in the north of Qingpingchang Town, a mountainous area in the northwest 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 System in the Yangtze River Basin. The coordinates of the ditch mouth are N31.5°, E104.1°. In terms of landform, it belongs to tectonic erosion cutting steep low-middle mountain landform, slope and gully landform. The basin generally extends east-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 the ditch at an altitude of 883m, and the highest peak is located at the Dingziya of Jiuding Mountain in the eastern part of the watershed, with an altitude of 2402m and a relative height difference of 1519m. There have been many large-scale debris flows in the ditch, which pose a great threat to Qingping Township.

[0049] Utilize the measureme...

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Abstract

The invention discloses a calculation method for the debris flow section mean flow rate and the application. The calculation method comprises the steps that parameters such as the debris flow fluid volume weight, the debris flow solid material volume weight, the debris flow channel or drainage groove gradient, the debris flow section hydraulic radius, the debris flow channel or drainage groove external roughness and the debris flow viscosity coefficient are determined by the means such as field investigation and measurement, actual sampling and actual volume weight measurement and indoor rheological experiments, the obtained parameters are substituted into a calculation formula for the debris flow section mean flow rate, and therefore the accurate debris flow section mean flow rate can be obtained. According to the method, the external roughness variations caused by the debris flow channel or drainage groove shape variations and the internal roughness generated by the debris flow fluid property are comprehensively taken into account, the debris flow section mean flow rate can be reasonably determined, a basis is provided for the debris flow exploration and the prevention engineering design, and the method is suitable for the requirements of the outdoor debris flow exploration and the actual engineering design.

Description

technical field [0001] The invention relates to a method for measuring and calculating the average flow velocity of a debris flow section, and its application in the condition of a natural channel of a debris flow or in checking the design rationality of a debris flow drainage channel. Background technique [0002] Debris flow is a common geological disaster in mountainous areas of China. It has the characteristics of sudden occurrence, short duration, ferocious onset, large erosion and silting, and strong destructive power. In recent years, under the disturbance of increasing seismic activity, coupled with the significant increase in extreme weather caused by global climate change, debris flow activities are very active, major debris flow disasters occur frequently, and the safety of people's lives and property is seriously endangered and threatened. In order to ensure the sustainable development of the mountain economy, the prevention and control of debris flow is very nec...

Claims

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Application Information

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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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