URBAN INUNDATION ANALYSIS OF GULPO STREAM, KOREA CONSIDERING CLIMATE CHANGE

摘要

Around the world, many countries are rapidly urbanized and impervious surface of the urban area has been increasing. Urbanization changes the concentration time and peak flood discharge in the urban area watershed. In this study, KMA-A2 RCM scenario is used to do the inundation analysis considering climate change in the Gulpo stream basin. The analysis showed that the frequency based rainfall can be increased up to 41.6% in research sites. Gulpo stream basin is one of tributaries in the Han-river basin which is the largest basin of the Korea. The Gulpo stream basin had been frequently inundated and damaged due to the back water level increase of Han-river during flood season. So, we used the XP-SWMM for the inundation simulation. The XP-SWMM developed by EPA can consider the full hydrologic cycle from stormwater, wastewater flow, and pollutant generation with pipe networking. As the simulation result, flood discharge was increased up to 13% in Gulpo stream basin. Therefore, hydrologic structures and flood defense measures to prevent the back water from downstream of Gulpo stream may be needed for the future flood prevention.