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Water level early-warning method based on small-watershed rainstorm torrential flood level rising changes in mountainous area

A flood water level and mountain torrent warning technology, applied in climate change adaptation, alarms, engine lubrication, etc., can solve problems such as lack of rainfall series data, solving critical rainfall, critical rainfall threshold uncertainty, etc., to improve accuracy , the early warning method is intuitive, and the effect is easy to obtain

Active Publication Date: 2019-07-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical application, due to the lack of effective rainfall series data in many small watersheds in mountainous areas, it is impossible to use the "water level-flow-rainfall" inversion method to solve the critical rainfall, resulting in the lack of stable and reliable "water level-flow-rainfall" in disaster control sections There are significant uncertainties in the determination of the critical rainfall threshold, and it is also difficult to grasp the response relationship of the storm torrent process in real time, which brings great difficulties to the early warning of storm torrents in small watersheds in mountainous areas.

Method used

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  • Water level early-warning method based on small-watershed rainstorm torrential flood level rising changes in mountainous area
  • Water level early-warning method based on small-watershed rainstorm torrential flood level rising changes in mountainous area
  • Water level early-warning method based on small-watershed rainstorm torrential flood level rising changes in mountainous area

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Experimental program
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Effect test

Embodiment 1

[0032] In this embodiment, the three times of rainstorms and torrents in small mountainous watersheds that have occurred in the past are analyzed, and the three times of rainstorms and torrents in small mountainous watersheds are used as early warning objects to simulate early warnings, and the feasibility of the method of the present invention is preliminarily judged.

[0033] 1. "6.3" flood in 2014 in the small watershed of Fuxing River in Chongqing

[0034] The Fuxing River in Chongqing City is the third tributary of the Yangtze River. The relationship between its main and tributaries is the Yangtze River-Qijiang-Sunxi River-Fuxing River. There is one national basic hydrological station at the beach station in the small watershed of the Fuxing River. The hydrological station controls a drainage area of ​​193km 2 . On June 3, 2014, affected by the torrential rain in some areas, the water level of Fuxinghe Beach Station reached the highest value of 254.12m at 8:36 on June 3rd...

Embodiment 2

[0071] On the basis that it is feasible to use the method of the present invention to carry out early warning of rainstorm and torrents in small watersheds in mountainous areas in embodiment 1, the present embodiment takes a certain rainstorm and torrent of Baisha River, a tributary of the Minjiang River as an example, and adopts the method provided by the invention to carry out Actual rainstorm and flash flood warning.

[0072] The Baisha River is a tributary of the Minjiang River, with a basin area of ​​364km 2 , there is Yangliuping hydrological station at the exit. After the Wenchuan Earthquake in 2008, the small watershed experienced frequent torrential rain and mountain torrent disasters. Taking the mountain torrent caused by a certain rainstorm in the upper reaches of Baisha River as an example below, the method of the present invention is used to carry out early warning of rainstorm and mountain torrent. The peak water level of the torrent caused by this rainstorm has...

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Abstract

The invention provides a water level early-warning method based on the small-watershed rainstorm torrential flood level rising changes in a mountainous area. The method comprises: step one, selectinga small-watershed channel segment needing rainstorm torrential flood warning as a target channel segment and determining a flood water level of the target channel segment based on an object with highflood vulnerability; step two, under the condition of rainstorm occurrence at the upstream of the target channel segment, monitoring a flood water level rising rate of the control fracture surface ofthe target channel segment till flood subsidence; and step three, determining whether to carry out early warning of migration preparation based on the changing information of the flood water level rising rate; if so, determining whether the flood reaches a flood water level sudden rising stage based on the real-time flood water level rising rate changing information; and if so, estimating estimated time of reaching the disaster water level by the flood water level and an estimated time of reaching the disaster water level by the flood water level; and carrying out migration warning immediatelyas soon as possible before the estimated time of reaching the disaster water level by the flood water level.

Description

technical field [0001] The invention belongs to the field of disaster prevention and mitigation of rainstorm and mountain torrent disasters, and relates to a water level early warning method based on the rising and changing level of rainstorm and mountain torrents in small mountainous watersheds, and is suitable for early warning of torrential rains and torrents in small mountainous watersheds. 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. The torrential rain and flood process in the mountainous small watershed has a very significant steep rise and fall process, and the flood rise and fall lasts for a short time. Wang Xiekang et al. (1999) analyzed 176 storm floods in typical small watersheds in Southwest China, and showed that the average flood duration of the floo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/10G01F23/00
CPCG01F23/00G08B21/10Y02A50/00
Inventor 王协康刘兴年闫旭峰曹辉许泽星
Owner SICHUAN UNIV
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