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Township-level tsunami risk assessment method based on Thiessen polygon

A Thiessen polygon and risk assessment technology, applied in the field of town-level tsunami risk assessment based on Thiessen polygons, can solve the problems of insufficient tsunami vulnerability, lack of precise unit division, and inability to meet the actual needs of town-level disaster reduction departments, etc. Achieve the effect of ensuring the safety of residents' lives and property, improving scientificity and operability, and ensuring high-speed and stable development

Active Publication Date: 2022-02-25
国家海洋环境预报中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many factors to be considered in the tsunami risk issue, including distance from the coast, inundation depth, disaster preparedness activities, socio-economic conditions, etc. It is time-consuming and labor-intensive to collect a variety of data
[0004] In the current tsunami risk zoning, only city (county)-level zoning analysis is done, lacking more detailed unit zoning, which cannot meet the actual needs of township-level disaster reduction departments
Moreover, in the tsunami vulnerability assessment, only one type of land use data is considered, and the analysis of tsunami vulnerability is not comprehensive enough and cannot represent the actual situation

Method used

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  • Township-level tsunami risk assessment method based on Thiessen polygon
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  • Township-level tsunami risk assessment method based on Thiessen polygon

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Embodiment 1

[0070] Such as Figure 1A , Figure 1B and figure 2 As shown, the embodiment of the present invention provides a township-level tsunami risk assessment method based on Thiessen polygons. The execution subject of the method in this embodiment can be any electronic device, and the method includes the following steps:

[0071] S1. Construct multiple Thiessen polygonal structures in the coastal area based on the basic geographic information data of the coastal area; each Thiessen polygonal structure has a control point as an emergency refuge space, and any grid unit of the Thiessen polygonal structure reaches the control point the shortest distance.

[0072] For example, the above-mentioned basic geographic information data includes coastline data, geographic distribution information of township-level residential areas, township administrative division data, elevation data, and water depth data.

[0073] Village-level / community-level residential data are extracted from the geo...

Embodiment 2

[0085] The results obtained by the method of this embodiment can provide decision-making support for disaster prevention and mitigation for coastal emergency management departments, and at the same time provide reference for site selection, development planning, and regional disaster prevention and mitigation management of major coastal projects, so as to ensure the rapid and stable development of coastal economy and the lives and properties of residents. Safety.

[0086] Each step of the first embodiment above will be described in detail below.

[0087] 201. Collect basic geographic information data in coastal areas; the basic geographic information data includes coastline data, geographical distribution information of township-level residential areas, township administrative division data, elevation data, and water depth data;

[0088] In this embodiment, the coastal area is divided based on latitude and longitude data to obtain multiple grid units, that is, the coastal area...

Embodiment 3

[0138] In order to better understand the content of the first and second embodiments above, the following four aspects will be described in detail from Thiessen polygon construction, tsunami risk analysis, tsunami vulnerability analysis and tsunami risk analysis.

[0139] First, Thiessen polygon construction

[0140] (1) Data collection

[0141] Collect basic geographic information data such as administrative divisions used in the construction of Thiessen polygons. The basic geographic information data includes coastline data, residential distribution data, and township administrative division data.

[0142] (2) Residential analysis

[0143] The village (community) level residential data is extracted from the residential distribution data. Important disaster-affected bodies that may be affected by tsunami disasters are also added as residential data, such as important factories, tourist areas, ports, and dangerous goods storage places.

[0144] (3) Polygon construction

[...

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Abstract

The invention relates to a township-level tsunami risk assessment method based on Thiessen polygons. The method comprises the following steps: constructing a plurality of Thiessen polygon structures in a coastal area based on basic geographic information data of the coastal area; according to historical earthquake and tsunami data in the coastal area, obtaining a tsunami danger level analysis result of each Thiessen polygon structure in combination with a tsunami numerical calculation model; obtaining a vulnerability evaluation result based on the ASTER elevation, the Sentinel1 data, the LANDSAT satellite data and the NPP / VIIRS light data; and combining the tsunami danger level analysis result and the vulnerability assessment result of each Thiessen polygon structure to obtain a township-level tsunami risk zoning result for display. According to the method, the tsunami risk assessment zoning scale is improved to the township level, tsunami fragility analysis is scientific and practical, and the fragility analysis reasonability is improved.

Description

technical field [0001] The invention relates to the technical field of computer forecasting, in particular to a method for assessing tsunami risk at the township level based on Thiessen polygons. Background technique [0002] Tsunami is a series of fluctuations with ultra-long wavelengths and periods that occur in the ocean, usually formed by the violent disturbance of seawater caused by submarine earthquakes. Tsunamis, which are difficult to detect in the deep sea, are likely to become extremely destructive disasters near the shore. The flow velocity of the tsunami wave is very high. If it hits the land, it will have a very strong destructive force and can easily knock down some buildings; such as the disasters caused by the Japanese earthquake and tsunami, the Indian Ocean tsunami, and the Chilean tsunami. To this end, industry insiders studied the tsunami risk in potentially affected areas. Currently, tsunami risk research is divided into two aspects: tsunami hazard and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q10/06G06Q50/26
CPCG06Q10/04G06Q10/0635G06Q50/26Y02A90/10
Inventor 侯京明徐志国王培涛高义王君成卢伟
Owner 国家海洋环境预报中心
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