Predicting and Solving the Dangers of Flood in Urban Basins Caused by Torrential Rainfalls:Based on Case Studies of Ansan Stream and Hwajeong Stream

摘要

This research was conducted to examine and assess the vulnerability of Korean urban areas to heavy rainfalls and propose a viable solution in preventing floods.The target of this research was Ansan of Gyeonggi Province,an urban area with Ansan and Hwajeong Streams and big river basins.To determine the status of Ansan's flood precaution,a simulation of heavy torrential rain was run on Ansan urban basins using the model CAMEL.The result was that Ansan is inadequately prepared for heavy rainfalls.Simulation showed that most of Ansan's downtown areas will flood during the heavy rain.From the simulation,a list of regions that are most vulnerable to flooding and attention has been compiled.To prevent further flooding in Ansan,this research tested scenarios with different flood preventative measures.After comparing different scenarios,it was discovered that reducing the impervious surfaces and adjusting water content and hydraulic conductivity of the soil show a significant decrease in the level of flooding.