Flood Disaster Risk Assessment of Ankang City in Upper Reaches of Hanjiang River Based on GIS
Shi Xiaojing
Zha Xiaochun
Guo Yongqiang
Shi Binnan
Abstract：The flood disaster has occurred frequently with serious losses in Ankang City, which locates in Qinba mountain areas in the upper reaches of Hanjiang River.According to the theory of flood disaster system, based on GIS and AHP, the flood disaster risk assessment on Ankang City was studied from the hazard and vulnerability of flood disaster.The natural factor indexes, including annual rainfall and precipitation variability in nearly 50 years, terrain elevation, slope and water system of Ankang City, were considered to analyze the flood hazard.The economic indicators, such as population density, GDP density and annual grain output per unit area, were selected to analyze the flood vulnerability.Then the AHP method was used to compute the weights of evaluation indexes,and the grid of ArcGIS was used to overlay the hazard and vulnerability of flood disaster.The results of flood disaster risk assessment for Ankang City was obtained.The results showed that the flood disaster risk of Ankang City concentrated mainly along the Hanjiang River, and decreased generally from the main stream to the branches.The results were in consistent with the "7.18" flood events in 2010, which showed the feasibility of the evaluation method.Meanwhile, the results could provide an important scientific basis for the reasonable flood control and disaster mitigation planning for Ankang City.
Keywords：Ankang cityUpper reaches of Hanjiang RiverFlood disasterRisk assessmentGISAHP
Publication Date：2017-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 88-94 )