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A Calculation Method of Flow Attenuation Value in Debris Flow Accumulation Area

A calculation method and accumulation area technology, which are applied in the field of calculation of the flow attenuation value in the debris flow accumulation area, can solve the problems of complex attenuation models, limitations, and many parameters involved, and achieve the effect of perfect calculation theory.

Active Publication Date: 2020-08-25
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The flow rate of the debris flow reflects the kinetic energy of the debris flow fluid. The main function of the debris flow drainage channel is to dissipate energy and discharge floods, thereby reducing the flow rate of the debris flow, thereby reducing the danger of the debris flow to the accumulation area; the current energy dissipation in the debris flow accumulation area is mainly through indoor experiments. The key point is to study the variation characteristics of debris flow energy. Its attenuation model is complex and involves many parameters. As a result, the use of the flow attenuation model based on debris flow energy in the design of drainage channels in debris flow accumulation areas is limited, and it cannot be extended efficiently and conveniently to design unit and production unit

Method used

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  • A Calculation Method of Flow Attenuation Value in Debris Flow Accumulation Area
  • A Calculation Method of Flow Attenuation Value in Debris Flow Accumulation Area
  • A Calculation Method of Flow Attenuation Value in Debris Flow Accumulation Area

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Embodiment 1

[0032] The watershed of Xiongjiagou in Shilong Formation, Shilong Village, Huilong Township, Shimian County is fan-shaped, with a drainage area of ​​5.5km 2 . The highest point in the watershed is 2990m above sea level, the ditch mouth is 1185m above sea level, and the relative height difference is about 1805m. The overall terrain is high in the northeast and low in the southwest. The valley is deep and the terrain undulates greatly. The length of the Xiongjiagou valley is 4.05km, and the average longitudinal slope of the valley is 376‰. During the period from 17:00 on July 4th to 7:00 on July 5th, 2013, heavy rain fell in Shimian County, causing severe erosion of the upper reaches of Xiongjiagou, resulting in a large-scale debris flow disaster. The "7.04" Xiongjiagou debris flow once washed out about 5.5×10 solid matter 4 m 3, where 4.3×10 4 m 3 The solid matter silts up the Zhuma River, causing blockage of the Zhuma River, about 1.2×10 4 m 3 The mudslide material cro...

Embodiment 2

[0039] Mozigou is located in Yangdian Village, Wenchuan County, Sichuan Province. It is a tributary on the left bank of the upper reaches of the Minjiang River. The terrain of the Mozigou watershed is generally deep-cut structural erosion low mountains and middle mountains. Larger features, deep cut "V" shaped valleys. Mozigou drainage area is 7.4km 2 , the longitudinal length of the watershed is 4.8km, and the water system in the watershed is distributed in a dendritic shape. The highest point is located at the ridge on the northeast side of the watershed, with an elevation of 3208m. The vertical ratio is reduced by 434‰.

[0040] In order to effectively prevent and manage debris flow, and prevent the Minjiang River from being blocked and threatening downstream safety, effective predictions are made based on the characteristics of the debris flow channel and drainage channel design. The specific calculation methods and steps are as follows:

[0041] A. According to the fiel...

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Abstract

The invention discloses a method for calculating the flow attenuation value of a debris flow accumulation area. The method comprises the steps that a gully gradient ratio J, a debris flow depth H and a debris flow gully width B of a gully accumulation area of earthquake region debris flow are acquired; the obtained parameters are substituted into an attenuation value calculation formula for determining the flow alphq of the earthquake region debris flow, and the debris flow prediction flow attenuation value in the debris flow accumulation process can be obtained. The method is suitable for flow attenuation value prediction in the accumulation process of the earthquake region debris flow. Compared with the prior art, the method is based on strict theoretical derivation, the attenuation condition of the flow of the earthquake region debris flow in the accumulation area can be obtained more accurately, and a basis is provided for design of drainage groove control projects of the gully accumulation area of the earthquake region debris flow; the method is easy and efficient to use, and can meet the requirement for geological disaster prevention.

Description

technical field [0001] The invention belongs to the technical field of mud-rock flow prevention and control engineering design application technology, and in particular relates to a calculation method of flow attenuation value in a mud-rock flow accumulation area. Background technique [0002] After the strong earthquake, the loose matter of the landslide in the watershed increased sharply, resulting in a significant increase in the hazards of debris flow. Strong earthquakes make the geological environment in the earthquake area more fragile, and geological disasters such as debris flows are more frequent and the scope of damage is larger. The debris flow accumulation area is an important place for human life and production in mountainous areas, and it is also the main area where debris flow floods. The maximum range of possible accumulation of debris after flowing out of the ditch directly determines the danger range of the debris flow accumulation fan. Because the vertic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 屈永平
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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