Identification method of mountainous torrent and sediment disaster-prone areas in the confluence area based on the change of river morphology and flow ratio of main and tributaries in mountainous areas
A technology for confluence areas and tributaries, which is applied in the field of identification of mountain torrent and sediment disaster-prone areas in the confluence area, can solve the problem of inability to accurately identify mountain torrent and sediment disaster-prone areas, to play the role of mountain torrent and sediment disaster mitigation, and to truly reveal mountain torrent and sediment Problems such as the common disaster-causing mechanism to achieve the effect of rapid identification
Active Publication Date: 2022-02-18
SICHUAN UNIV
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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 rainfall-runoff-water level, and the critical rainfall / water level threshold condition is used as the criterion. The impact of sediment silting caused by incoming sediment from the main tributaries and changes in the shape of the river makes it difficult to truly reveal the common disaster-causing mechanism of mountain torrents and sediment, and it is also impossible to accurately identify the disaster-prone areas of mountain torrents and sediment disasters in the intersection areas of main and tributary rivers in mountainous watersheds , it is difficult to play an effective role in the mitigation of mountain torrent and sediment disasters
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[0069] In this embodiment, taking the intersection of Wenjiagou and Mianyuan River as an example, the method for identifying the disaster-prone areas for mountain torrents and sediment disasters in the intersection area based on the change of the flow ratio of the mountain river and the main tributary is described.
[0070] ①The intersection of Wenjiagou and Mianyuan River is selected as the target river section. The target river section has already built bridges, highways, schools, gas stations, houses and so on.
[0071] ②Measure the river width of the mainstream and tributaries in the intersection area. After on-site survey in 2010, it was found that the average river width of the tributary Wenjiagou is about 20m, and the riverbed gradient is about 0.256, that is, B 支 = 20m, J 支 = 0.256, the average river width of the mainstream Mianyuan River in the intersection area is about 400m, and the river bed gradient is about 0.01, that is, B 主 =400m, J 支 =0.01.
[0072] ③ Combi...
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The present invention provides a method for identifying disaster-prone areas of mountain torrent and sediment disasters in the confluence area based on the change of the flow ratio of the river form and the main tributary in the mountainous area. The river section has disaster prevention and protection objects; ②Measure the river width of the mainstream and tributaries in the confluence area, and record them as B 主 , B 支 , to measure the riverbed gradient of the mainstream and tributaries in the confluence area, denoted as J 主 、J 支 ; ③ Calculate the momentum ratio M of the tributary and the mainstream in the intersection area according to the formula * , if the momentum ratio M of the tributary to the mainstream in the confluence area * ≥1, the intersection area is a disaster-prone area for mountain torrents and sediment disasters. This method can quickly identify the disaster-prone areas of mountain torrent and sediment disasters in the confluence area of mountainous rivers, and provide scientific and reliable guidance for the safety planning of human activity areas along the coast of mountainous river confluence areas and the prevention and control of torrent and sediment disasters.
Description
technical field [0001] The invention belongs to the field of mountain torrent and sediment disaster prevention and control, and relates to a method for identifying disaster-prone areas of mountain torrent and sediment disaster in the intersection area based on the change of the flow ratio of mountain rivers and main tributaries. Background technique [0002] Mountain torrent disasters refer to flood disasters caused by rainfall in hilly areas, as well as debris flows, landslides and other disasters that cause losses to the national economy and people's lives and properties. Mountain torrents have become the main types of natural disasters in the world, frequently causing heavy casualties and property losses. According to a survey by the International Meteorological Organization, 105 of the 139 countries ranked first and second in the loss of flash flood disasters. my country's mountain torrent disaster prevention area is 4.63 million km 2 , accounting for 48% of the land a...
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IPC IPC(8): G06Q10/06G06Q50/26
CPCG06Q10/063G06Q50/26Y02A10/40
Inventor 王协康许泽星刘兴年闫旭峰孙一
Owner SICHUAN UNIV