GEOGRAPHICAL RESEARCH ›› 2010, Vol. 29 ›› Issue (12): 2212-2222.doi: 10.11821/yj2010120010

• Earth Surface Processes • Previous Articles     Next Articles

Risk assessment of major natural hazards in Dalian City

WANG Geng1,2, DING Xiao-jing2, GAO Xiang-ling2, GAO Hong-juan2, WANG Li1,2   

  1. 1. Center for Studies of Marine Economy and Sustainable Development of Liaoning Normal University, Dalian 116029, Liaoning, China;
    2. Urban and Environmental School of Liaoning Normal University, Dalian 116029, Liaoning, China
  • Received:2009-12-28 Revised:2010-08-15 Online:2010-12-20 Published:2010-12-20

Abstract:

Dalian, a coastal city located in the southern Liaodong Peninsula, is prone to natural hazards. The natural hazards that Dalian suffers most are diverse, with high frequency and wide distribution. Various hazards have become a major concern in urban economic and sustainable development currently. Natural hazards risk assessment involves a number of data, which are much of spatial, non-linear and random features. GIS, as a useful tool to analyze and manage spatial information, has a huge superiority. A case study in Dalian City explored the assessment mechanism for natural hazards, and developed a method of spatial differences assessment based on GIS in this paper. The method includes 4 steps: (1) Developing natural hazards risk assessment indicators system concerning five types of hazard related to flood, geology, earthquake, meteorology and environmental pollution on the basis of probability of hazard, endangering time and loss; (2) Digitizing Dalian City and setting its 106 county units database and kilometric GRID database of natural hazards indicators, referring to Dalian history records on the basis of remote sensing data and site data, which can provide accurate and substantial data for natural hazards study of Dalian City; (3) Figuring out single element risk index and multi-elements risk composite index of natural hazards indicators by using Graham method and the principal components-entropy with the weight of indicator; (4) Classifying the composite risk zone and mapping the assessment result of natural hazards risk in grid by MapInfo of assigning method and vertical map tools, and ranking the major hazard factors. The visual and quantitative spatial differences of natural hazards risk based on GIS enable regional planners to know the zonation of hazard risk accurately in planning the principal function region. The results can provide references for hazard prevention and reduction of Dalian City.

Key words: major natural hazards, risk assessment, GIS, Dalian