The Improvement of Water Cycle Analysis System in Urban Watershed: Focused on Hyoja-dong in Seoul

Abstract

Recently, disasters such as floods, localized heavy rains, and typhoons have occurred every year due to climate change. In the past, studies focused on flood control, where damage frequently occurred, but recently, as interest in urban water circulation has increased, awareness of water circulation management has increased. The most important thing to manage the water cycle is to set quantitative water management goals and the exact water cycle application point. Therefore, in this study, to improve the limitations of the water cycle analysis using only the land cover map in the existing urban watershed, an overlapping map analysis was conducted, and an integrated analysis of the building area and building information was conducted for the points where the land cover map was not analyzed. To review the effectiveness of LID facilities, the model was used to analyze Hyoja-dong, Seoul. It was analyzed that peak flood volume was reduced by 28% and 30%, the Return period 5 years, 10 years Rain duration 10min runoff volume was reduced by 18% and 14%, and the flooded area was reduced by 92% and 93%.