A method for identification and extraction of mountain torrent risk in a river basin

An extraction method and risk identification technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of complex evaluation and calculation process, sensor damage wireless transmission, difficult to complete collection, etc., to improve monitoring and early warning capabilities. Effect

Inactive Publication Date: 2017-04-12
FUJIAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its limitations include: (1) There are many models for comprehensive calculation, and the final evaluation results lack comparability
The sources of these data are different, the standards are different, it is difficult to collect them completely, and many data are dynamically changing over time
(3) The evaluation and calculation process is complicated, and there are many subjective factors, which cannot be automated
The disadvantage of this technical system is the lack of reliability, and there is a risk of failure in multiple links
The sensor may be damaged by natural or human factors. There are many factors affecting wireless transmission, such as power supply, signal, lightning, etc. The monitoring center and the person on duty also have a problem of human judgment

Method used

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  • A method for identification and extraction of mountain torrent risk in a river basin
  • A method for identification and extraction of mountain torrent risk in a river basin
  • A method for identification and extraction of mountain torrent risk in a river basin

Examples

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Embodiment Construction

[0048] The following takes the automatic identification of mountain torrent risk basins in Fujian Province as an example to illustrate the implementation process of this invention patent.

[0049] 1. Data preprocessing

[0050] 1. The original data ASTERDEM, the geographic coordinates are WGS1984, define a projected coordinate system for it as WGS84_UTM50N, and the grid resolution is set to 30 meters.

[0051] 2. Cut out the research area (it can be slightly larger than the area of ​​Fujian Province so as to include all watersheds), such as figure 2 shown.

[0052] 2. Extraction of watershed range at each level

[0053] 1. Fill the depressions in the DEM of Fujian Province by using the spatial analysis-hydrological analysis-depression filling tool in the commonly used geographic information system software ArcGIS.

[0054] 2. Based on the DEM without depressions, use the D8 algorithm to calculate the flow direction.

[0055] 3. Based on the water flow direction data, use ...

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Abstract

The invention discloses a torrential flood risk identification and extraction method of drainage basins. According to the torrential flood risk identification and extraction method, the drainage basins in which a torrential flood risk exists are extracted and identified in a large area range by utilizing DEM (Digital Elevation Model) data have been covered in China and are classified, so as to provide relatively wide and complete judgment basis for torrential flood and debris flow; prevention of torrential flow is selectively enhanced, and prewarning and flood control facilities are arranged, so that the monitoring and prewarning capabilities of geological hazards, such as torrential flood can be enhanced and an important application value is achieved; an auxiliary support is provided for making decision on the prevention and control works of the torrential flow hazards.

Description

technical field [0001] The invention relates to a technical method for directly identifying mountain torrent disaster risk according to terrain data, in particular to a method for identifying and extracting mountain torrent risk in a watershed. Background technique [0002] Mountain torrent disasters refer to floods caused by rainfall in hilly areas, mudslides and landslides induced by floods, which cause losses to the national economy, people's lives and property. my country is a mountainous country, and the area of ​​hilly areas accounts for about 2 / 3 of the country's land area. Flash flood disasters occur frequently and seriously, causing a large number of casualties and property losses every year. Mountain torrent disasters in my country have the characteristics of wide distribution, frequent occurrence, strong suddenness, difficult monitoring and early warning, rapid disaster formation, and great destructiveness. According to statistics, before the 1990s, the number of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCY02A90/10
Inventor 林广发杨城李清远刘鑫垚叶金玉
Owner FUJIAN NORMAL UNIV
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