Development of Decision Support System for Flood Disaster Risk Management

Abstract

ABSTRACT: Recently, unexpected inundation damages from local heavy rain and typhoons due to climate changes have increased in Korea. To reduce the flood related damages, a decision support system has been developed to improve decision making and disaster assessment in which a three-dimensional semi-implicit numerical model was used to simulate inundation aspects and the geographical information, such as building information, population, utilities and land use patterns to support decision making. The Munsan City area, where there were three big inundation damages in 1996, 1998 and 1999, respectively, is selected to test the developed decision model. To test the simulation model and the simulated geographical information, hydraulic data, hydrology data and geographic data, such as digital maps of 1/1,000 and 1/5,000 scale, cadastral maps, building plan, and price of house in the test area are collected. This geographical information is used to build up the three-dimensional numerical grid and to support decision making for minimizing flood related damages based on the simulated results. The results of simulated inundated area were compared with the photo of 1999 flooding and the estimated damages are compared with real damages of Munsan Area in 1999. The simulated results well represented the flooding situation and it is expected that the new decision support system will be used to make decision for minimizing flood related damages. Keywords: Inundation, 3D Semi-implicit Finite Difference Method, Decision Support System, Analysis of Disaster Information