도시홍수 피해 저감을 위한 최적의 표면유출 네트워크 기반의 그린 인프라스트럭쳐 계획

Abstract

Urban flooding is caused by an increase in surface area as a side effect of both urbanization and the natural limitations of drainage system capacity to cope with surface runoff. Appropriate measures are necessary to respond to urban flood damage. To respond to areas with surface runoff damage due to the prevalence of urban floods, this research provides green infrastructure planning by deriving optimal routes. This is accomplished by conducting analysis with respect to surface runoff networks as well as selecting target areas for green infrastructure applications. Our proposed green infrastructure planning process is presented by applying it to Daejeon Metropolitan City. A Least-Cost Paths analysis was utilized to derive the optimal surface runoff network, and a flood vulnerability analysis was performed by selecting target areas for green infrastructure planning. Finally, the types of green infrastructure were classified based on a literature review to suggest applicable types of green infrastructures within each target area. The main results of applying this method to Daejeon Metropolitan City are as follows. First, the optimal surface runoff network was derived from the starting point of the Gap Stream to the destination point of Se-dong basin area within Yuseong-gu. Second, seven cells with high flood vulnerability were derived where the green infrastructure would be applied as a priority. Finally, the green infrastructure considering its application in each cell was derived, including green alleys, detention ponds, bio-swales, and permeable pavement. This research was able to establish the proposed method by combining the optimal surface runoff network derivation with green infrastructure planning. This process is universally applicable to areas where urban flood damage occurs, including Daejeon Metropolitan City, where this case study was conducted.