Urban Flood Risk Analysis using Distributed Mathematical Model: A Case Study in Yom River Basin, Thailand

摘要

This paper presents an analysis of flood control management in an urban area using a distributed flood risk analysis system. The system was used to analyze the effects of a flood control option with a dyke for a major past flood scenario. The simulated results show that although the existing dyke was able to stop overflow from riverside, its length was not enough to stop floodwater entering to the inner part of the city around it. With the extension of the dyke length covering the inner part, the city can be protected from flooding due to overflow from Yom River for a large flood event like 1995. It showed that with the proposed extension of the dyke, the economic damage could be reduced by a large extent as number of residential and non-residential buildings affected by floods can be substantially reduced. The present study is an example of usefulness of distributed mathematical model in urban flood risk management. Although, the results presented here is limited to flood inundation analysis and estimation of number of flooded affected buildings, the system is capable of analysis of the detailed economic risks for any flood event. With such a system, the flood risk in any urban areas due to flooding can be estimation and the mitigation options such as flood control measures can be evaluated. Such a system can be useful for decision-making bodies in flood risk management.