Risk division of rainstorm and water-logging disasters in Ningbo City based on fuzzy comprehensive evaluation

The study presents a methodology for building a risk division model and drawing a risk division map of rainstorm and water-loggingdisasters in Ningbo city. Based on fuzzy comprehensive evaluation method, AHP (Analytic Hierarchy Process) entropy method, GIS spatialanalysis technique and gridding GIS technology, the model is built on the basis of natural and socioeconomic situations in addition to thehazard，sensitivity, exposure, disaster prevention and mitigation capacity of rainstorm and water-logging. The results show that the high riskregions of rainstorm and water-logging disasters locate in the urban areas of Ningbo, Beilun, Ninghai and Xiangshan, south-central Yinzhou,central and northern Yuyao, while the low risk regions are the northern Cixi, western Fenghua, the east of Yinzhou and Beilun. Disaster leveland risk index have a good correlation, and the correlation coefficient reaches 0.8217 and passes the significant test at 0.01 level.