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Mountain area small watershed mountain torrent disaster early warning method based on rain-water-sand change

A technology for small watersheds and torrents, which is applied to the early warning of torrential rain and torrent disasters in small watersheds in mountainous areas, and in the field of early warning of mountain torrent disasters in small watersheds in mountainous areas.

Active Publication Date: 2020-07-10
SICHUAN UNIV
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Problems solved by technology

For small watersheds in mountainous areas, especially mountainous watersheds where sand production and transport are serious disasters, it is relatively easy to use only the water level and flow back-push rainfall early warning method commonly used in the existing technology, without considering the problem of water level increase caused by sediment silt beds If there is a missed alarm, the accuracy of the flash flood warning needs to be improved

Method used

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  • Mountain area small watershed mountain torrent disaster early warning method based on rain-water-sand change
  • Mountain area small watershed mountain torrent disaster early warning method based on rain-water-sand change
  • Mountain area small watershed mountain torrent disaster early warning method based on rain-water-sand change

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Embodiment 1

[0078] This embodiment takes the Longchi Town section of the Longxi River as an example to describe in detail the method for early warning of mountain torrent disasters in small mountainous watersheds based on changes in rain-water-sand provided by the present invention.

[0079] Located in Dujiangyan City, Sichuan Province, Longxi River is a tributary on the left bank of the Minjiang River, with a total drainage area of ​​79km 2 , through field investigation, sediment sampling, and GPS topographic survey of the Longchi Town section of the Longxi River, it was found that the average river width of the Longchi Town section is 30.0m, and the average gradient is 2.25%. Figure such as figure 2 As shown in Figure (A), the photo of the river section of Longchi Town is as follows figure 2 As shown in (B) figure. exist figure 2 Select 25 test sections from the river section circled by the dotted line in (B) and record them as CS1~CS25. Among them, the gradient of CS20~CS25 is 2....

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Abstract

The invention provides a mountain area small watershed mountain torrent disaster early warning method based on rain-water-sand change. The method comprises the following steps: selecting a siltable section from a siltable river reach of a target river reach; calculating the disaster water level of the siltable section behind the designed flood sand-carrying silt bed under different designed floodflow conditions, and drawing a water level flow relation curve; according to the early warning water level of the siltable section, obtaining the flow corresponding to the early warning water level ofthe siltable section from the water level flow relation curve, wherein the flow is the early warning flow, and the critical rainfall is reversely deduced according to the early warning flow; after heavy rainfall occurs at the upstream of the target river reach, monitoring the rainfall information in real time, and when the rainfall reaches or exceeds the critical rainfall, sending out mountain torrent disaster early warning. According to the method, the coupling effect of sediment and flood of the small watershed in the mountainous area is fully considered, the problem of water level increasecaused by sediment silt beds is considered when the early warning indexes are established, and more scientific basis and guidance can be provided for mountain torrent disaster prevention and controlof the small watershed in the mountainous area.

Description

technical field [0001] The invention belongs to the field of disaster prevention and mitigation of torrential rain and mountain torrents, and relates to a method for early warning of mountain torrent disasters in small watersheds in mountainous areas based on changes in rain-water-sand, and is suitable for early warning of torrential torrents in small watersheds in mountainous areas. Background technique [0002] Mountain torrent disasters refer to flood disasters caused by rainfall in hilly areas, as well as mudslides and landslides induced by mountain torrents, which cause losses to the national economy and people's lives and property. For a long time, the research on the theory of rainstorm and mountain torrent disaster forecasting and early warning and prevention technology has mostly focused on the analysis of inundation disasters caused by the change of "rainfall-runoff-water level", with critical rainfall / water level threshold conditions as the criterion [Xu Shaojun et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10G06Q50/26
CPCG06F17/10G06Q50/26Y02A10/40
Inventor 王协康许唯临刘兴年闫旭峰刘同宦杨青远
Owner SICHUAN UNIV
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