Calculation method of starting flow depth of glacial debris flow

A calculation method and technology of debris flow, applied in calculation, design optimization/simulation, special data processing application, etc., can solve problems such as unpredictable glacial debris flow, and achieve the effect of avoiding personal and property losses

Active Publication Date: 2018-05-11
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Application Information

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Problems solved by technology

This solves the unpredictable problem of glacial debris flow. By analyzing the climate conditions, the runoff depth and the ti

Method used

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  • Calculation method of starting flow depth of glacial debris flow
  • Calculation method of starting flow depth of glacial debris flow
  • Calculation method of starting flow depth of glacial debris flow

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Experimental program
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Embodiment 1

[0033] In order to verify the correctness and practicability of the glacial debris flow starting depth model, the Tianmogou glacial debris flow in Tibet is selected as the research object. Tianmogou is located in Songrao Village, Guxiang, Bomi County. The drainage area of ​​the Tianmogou Glacier Debris Flow Gully is 17.74km. 2 The main channel is 4.76km long, with a relative elevation difference of 3100m, among which the ditch mouth is 2460m above sea level, the seasonal snow line is at 3900m, and the glacier area is about 9km 2 , The overall shape of the valley is "V"; the average channel aspect ratio of Tianmogou is about 244‰, and the average slope of the channel slopes on both sides of the bank is above 35°. When calculating the thickness of different places, due to the many influencing factors, the results obtained are not the same. The following is the specific calculation method and steps of the incipient flow depth of the glacial debris flow:

[0034] According to step S100...

Embodiment 2

[0054] In order to obtain the gully slope of the glacial debris flow gully to be measured more conveniently, to obtain the internal friction angle of the moraine , On the basis of embodiment 1, in this embodiment, the internal friction angle of the moraine The calculation method of is to take natural samples of the moraine and obtain the friction factor μ by using the soil mechanics experiment of the moraine, according to the formula: Calculated, where Is the internal friction angle inside the moraine.

[0055] In order to better measure the saturated bulk density of the moraine deposit γ sat In this embodiment, the saturated bulk density γ of the moraine deposit sat The calculation method is as follows:

[0056] γ sat =(w 0 +v v γ w ) / v

[0057] Where w 0 Indicates the dry weight of the experimental material, v v Represents the porosity of the experimental material, γ w Represents the density of water, and V represents the volume of moraine deposits.

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Abstract

The invention discloses a calculation method of starting flow depth of a glacial debris flow, by means of field investigation and field measurement of characteristics of a glacial debris flow gully drainage basin, measurement of the source nature of the glacial debris flow, measurement of air temperature and rainfall intensity in the drainage basin and the like, a gully channel slope alpha of a glacial debris flow gully, a gully channel longitudinal slope J, a gravity stress W of saturated glacial till, a saturated unit weight yat of the glacial till, a bulking thickness h of the glacial till,a void ratio e of the glacial till, an internal friction angle of the glacial till (img file='DDA0001510137630000011.TIF' wi'54' =he='47' /) are determined, the obtained parameters are put into a calculation formula, and predicted value of starting flow depth threshold of the glacial till in the glacial debris flow gully can be acquired. The flow depth formed by melt water under the conditions ofair temperature, air temperature and rainfall converting into the critical flow depth started by the glacial till in the glacial debris flow is predicted, starting condition characteristic value of the glacial debris flow gully can be accurately obtained, it can provide a basis for the prevention and treatment and prediction of the glacial debris flow, and the needs of geological disaster prevention are satisfied.

Description

Technical field [0001] The invention relates to the technical field of natural disaster prevention applications, in particular to the field of prevention technologies or methods for glacial debris flow disasters, and specifically, is a method for calculating the starting depth of glacial debris flow. Background technique [0002] Glacial debris flow is a disaster geomorphic phenomenon closely related to glacier movement. The glacial debris flow is mainly the glacial debris flow induced by the instability of the moraine and the glacial debris flow induced by the outburst of the moraine lake. Hu Guisheng and others classified the types of debris flow in Linzhi, Tibet, and found that glacial rainfall-type debris flow accounted for 36.4% of all debris flow types. [0003] The formation of glacial debris flow is not only affected by rainfall conditions, but also by many factors such as temperature changes. Fleischmann believes that the formation of glacial debris flow is a complex pro...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 屈永平
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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