Channel-started debris flow occurrence pre-warning method and application
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A debris flow and channel technology, applied in the field of water conservancy engineering and debris flow prevention and control engineering, can solve problems such as loss of personnel, casualties, etc.
Active Publication Date: 2013-12-25
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
However, for low-frequency debris flows, there is often no accumulation of observation data, so it is impossible to obtain an empirical method for the critical rainfall value based on the observation data, thereby predicting the occurrence of debris flows
The occurrence of such low-frequency debris flows often causes heavy losses and casualties.
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Embodiment 1
[0096] figure 1 It is a schematic diagram of the technical process. The method of the invention is used to carry out early warning of debris flow initiation in Sanyanyugou and Luojiayugou two debris flow channels.
[0097] The county seat of Zhouqu County, Gansu Province is built on the accumulation fan of Sanyanyugou and Luojiayugou. Sanyanyugou has branch ditches Dayanyugou and Xiaoyanyugou, and Bigyanyugou is its main ditch. Its watershed parameters are more conducive to the formation of debris flow than those of Xiaoyanyugou, so Bigyanyugou is used The formation area of debris flow in this area is used as the early warning and monitoring area of Sanyanyugou. Investigate surveying and mapping and inquire local hydrological manuals to determine the following basic parameter data of the Sanyanyu Valley and Luojiayu Valley debris flow formation areas:
[0098] Sanyan Valley: J=0.314, A 0 =8.68km 2 , L=4.11km, R 0 =435.8mm, C v =0.73; Luojiayugou: J=0.261, A 0 =10.1...
Embodiment 2
[0104] image 3 It is a schematic diagram of the technical process. The method of the invention is used to implement early warning of debris flow start-up in the Aizigou debris flow channel of Baihetan Hydropower Station in Sichuan.
[0105] The following basic parameter data of the Aizigou debris flow formation area are determined through surveying, surveying, and local hydrological manuals: J=0.29, A 0 =9.18km 2 , L=4.28km, R 0 =769mm, C v =0.3.
[0106] The above basic parameter data J, A 0 and L are respectively substituted into formula 2 and formula 3, and the calculation determines that F=0.501 and A=9.18.
[0107] After investigation, the formation area of the Aizigou debris flow is basalt, siltstone interbedded with thin mudstone, and there are two fault zones passing through the formation area. The local seismic intensity is VIII, the annual average temperature is 9.1°C, and the average rainfall is 769mm. Salt rock, compare Table 1, Table 2, Table 3 and fig...
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Abstract
The invention discloses a debris flow pre-warning method. In view of the shortcoming that the channel-started debris flow critical rainfall threshold calculation method in the prior art needs to be based on long-term debris flow observation data, the invention provides a debris flow pre-warning method. The core of the method is a debris flow start critical value Cr calculation method expressed by debris flow channel topography, geology, and a hydrological factor. According to the method, the Cr value of a pre-warning monitored area is used as a monitored value, and debris flow pre-warning levels are set according to the magnitudes of monitored values; when Cr is less than 0.35, the condition is green and safe; when Cr is larger than or equal to 0.35 and less than or equal to 0.47, a debris flow orange pre-warning is issued; and when Cr is larger than or equal to 0.47, a debris flow red pre-warning is issued. In optimized condition, the rainfall amount of 1h is used as a common monitored value at the same time. The invention also provides a debris flow pre-warning method with an equivalent rainfall R* value as a main monitored value. The method has a reliable principle, the threshold calculation more conforms to debris flow forming mechanism; the threshold calculation is not based on long-term observation data, and has better disaster preventing applicability.
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 and application thereof, belonging to the fields of mud-rock flow prevention and control engineering and water conservancy engineering. Background technique [0002] A channel is a steeply sloping water collection channel that is washed by intermittent floods. After the slope runoff is generated, along the slope direction, with the continuous increase of rainfall runoff accumulation, a flash flood with large single-width discharge and flow velocity is formed. Channel erosion refers to the erosion form in which the slope runoff concentrates on the soil and parent rock and cuts into the ground to form a large gully. Loose solids are abundant in the trenches. When the loose solids are tilted or bottomed out due to climate, environment, and hydrological influences, debris flows will start. This type of debris flow is called channel erosion ...
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