Composite risk assessment of typhoon-induced disaster for China's coastal area

Typhoons, as one of the most devastating natural hazards in China's coastal area, have caused considerable personal injury and property damage throughout history. An indicator system which included two aspects of hazard and vulnerability with 14 indicators was built up for composite risk assessment of typhoon-induced disaster. The analytic hierarchy process was used to calculate the weight of each indicator, and the composite risk assessment model was then built up. The results indicated that there were no very high- or very low-risk areas in China's coastal area. Out of the 18,000-km-long China land coastline, 30.99 % was at low risk, mostly along the coastal hill-mountain zone, Hainan and Guangxi coast; the major part (62.71 %) of the coastal area was classified as at moderate risk. Although only 6.30 % of the total was at high risk, the affected area was mainly distributed in Tianjin, Shanghai, and Guangzhou, the three main deltas with low topography, a highly developed economy, and a very dense population.