Debris flow early warning method

A technology for debris flow and early warning area, which is applied in the directions of alarms, measuring devices, instruments, etc., can solve the problems of lack of basic data, the calculation and determination of the threshold value of debris flow early warning rainfall is not applicable or not applicable, etc.

Inactive Publication Date: 2011-06-22
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

Therefore, due to the lack of basic data, the prevailing method cannot be applied to the early warning of debris flow in such areas, and there has been no applicable method for the calculation and determination of the rainfall threshold of the debris flow early warning.

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] As shown in Figure 1, the method of the present invention is used to carry out early warning of debris flow in Shijiagou, Ningnan County.

[0023] Ningnan County is located in the southeast of Liangshan Yi Autonomous Prefecture, Sichuan Province, at latitude 26°50′12″~27°18′34″ north, longitude 102°27′44″~102°55′09″ east. The county seat is located in the upper part of the debris flow accumulation fan group, surrounded by mountains on three sides in the northwest, northeast and southeast and opening to the southwest. Shijiagou is located directly behind the county seat, and a large amount of loose solid matter has accumulated in the ditch, which can easily cause mudslides when encountering a certain intensity of rainfall, posing a serious threat to the safety of the county seat.

[0024] The debris flow early warning for Shijiagou (warning area) shall be carried out according to the following plan——

[0025] Step S1, on-site investigation of early warning area and layo...

Embodiment 2

[0081] As shown in Figure 2, the method of the present invention is used to carry out early warning of debris flow in Shijiagou, Ningnan County, and its similarity with Embodiment 1 will not be repeated. The difference is that in step S222, the historical disaster data of the early warning area is used to correct the early warning area. The content of the calculation value of the early warning rainfall threshold of each monitoring station is as follows:

[0082] Step S222, calculating the early warning rainfall threshold I of each monitoring station in the early warning area 60 +P a

[0083] First, according to step S21, calculate the average rainfall threshold of the basin , Step S11 investigation and calculation gained formation area, confluence area data are calculated according to formula 3,10 to determine the early warning rainfall threshold I of each monitoring station 60 +P a , and then according to the data analysis of the debris flow disaster record data in the e...

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Abstract

The invention discloses a debris flow early warning method. Aiming at the technical problem that the prior art cannot solve calculation and determination of early warning rainfall threshold value of a debris flow early warning system in a basic data information lacking region, the invention provides the debris flow early warning method applied in the basic data information lacking region. The method comprises the following steps of: arranging rainfall monitoring sites at reasonable places of a debris flow valley; taking the sum of 1hr rainfall intensity value of rainfall data of the rainfall monitoring sites and early affected rainfall value as an early warning rainfall threshold value; calculating and determining the early warning rainfall threshold value of each site based on a debris flow starting mechanism by using the data of rainfall, hydrographic characteristic, terrain in the valley, loose solid substances and the like of a debris flow early warning region, presetting each threshold value in the early warning system, and judging whether to start the early warning system for early warning through the real-time comparison result of the real-time rainfall data and the threshold values. In the method, the principle is reliable, the calculation process is scientific and simple, implementing equipment is simple and installation is convenient, and the method can be universally applied to the requirements of debris flow early warning of various debris flow regions.

Description

technical field [0001] The invention relates to a mud-rock flow early warning method, in particular to a mud-rock flow early warning method realized by presetting and monitoring the rainfall threshold value which causes the mud-rock flow, and belongs to the field of water conservancy engineering. Background technique [0002] Debris flow is a natural phenomenon in which a fluid composed of poorly sorted rocks, soil, a large amount of water, and a small amount of gas flows down slopes and valleys. The most common type of debris flow is a debris flow triggered by rainfall. It's called a rainstorm mudslide. For the rainstorm debris flow, the rainfall amount and rainfall intensity in the debris flow ditch basin are the decisive factors for the initiation of the debris flow. When the rainfall conditions in the watershed reach or exceed a certain level of rainfall and intensity, the watershed will form a rainstorm debris flow, and the rainfall and rainfall intensity at this time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/10G01W1/14
CPCY02A90/10
Inventor 潘华利欧国强黄江成柳金峰吕娟杨顺季宪军王钧
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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