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A town-level tsunami risk assessment method based on Thiessen polygons

A technology of Thiessen polygon and risk assessment, applied in the field of township-level tsunami risk assessment based on Thiessen polygon, can solve the problems of tsunami vulnerability that is not comprehensive enough, lacks fine unit division, and cannot meet the actual needs of township-level disaster reduction departments, etc. Achieve the effects of improving scientificity and operability, ensuring the safety of residents' lives and property, and ensuring high-speed and stable development

Active Publication Date: 2022-07-05
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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  • A town-level tsunami risk assessment method based on Thiessen polygons
  • A town-level tsunami risk assessment method based on Thiessen polygons
  • A town-level tsunami risk assessment method based on Thiessen polygons

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Embodiment 1

[0070] like Figure 1A , Figure 1B and figure 2 As shown, an embodiment of the present invention provides a town-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 the grid cells of any Thiessen polygonal structure to 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 settlements, township administrative division data, elevation data, and water depth data.

[0073] Village-level / community-level settlement data is extracted from the geographic distribution...

Embodiment 2

[0085] The results obtained by the method in this embodiment can provide decision 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 the coastal economy and the lives and properties of residents. Safety.

[0086] The steps of the above-mentioned first embodiment will be described in detail below.

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

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

Embodiment 3

[0138] In order to better understand the contents of the first and second embodiments above, the following is a detailed description from four aspects: Thiessen polygon construction, tsunami risk analysis, tsunami vulnerability analysis and tsunami risk analysis.

[0139] First, the construction of Thiessen polygons

[0140] (1) Data collection

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

[0142] (2) Analysis of settlements

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

[0144](3) Polygon construc...

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Abstract

The invention relates to a town-level tsunami risk assessment method based on Thiessen polygons, comprising: constructing a plurality of Thiessen polygonal structures in the coastal area based on the basic geographic information data of the coastal area, and according to the historical earthquake and tsunami data in the coastal area, Combined with the tsunami numerical calculation model, the tsunami risk level analysis results of each Tyson polygonal structure are obtained; the vulnerability assessment results are obtained based on ASTER elevation, Sentinel1 data, LANDSAT satellite data and NPP / VIIRS light data; the tsunami of each Tyson polygonal structure is calculated. The hazard level analysis results are combined with the vulnerability assessment results to obtain the tsunami risk zoning results at the township level for display. The method of the invention increases the tsunami risk assessment division scale to the township level, and the tsunami vulnerability analysis is both scientific and practical, and improves the rationality of the vulnerability analysis.

Description

technical field [0001] The invention relates to the technical field of computer prediction, in particular to a town-level tsunami risk assessment method based on Thiessen polygons. Background technique [0002] A tsunami is a series of waves with ultra-long wavelengths and periods that occur in the ocean, usually caused by severe disturbances in seawater caused by undersea earthquakes. A tsunami that is difficult to detect in the deep sea can become a very destructive disaster when it reaches the shore. The speed of the tsunami wave is very large. If it hits the land, it has a very strong destructive power and can easily knock down some buildings. To this end, industry insiders have studied the tsunami risk in potentially affected areas. At present, tsunami risk research is divided into two aspects: tsunami risk and tsunami vulnerability. Tsunami vulnerability is an important part of this. [0003] The surrounding coastal areas of my country are located in the Pacific Ri...

Claims

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Application Information

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Patent Type & Authority Patents(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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