Exploring Climate Change Adaptation in Urban CSOs Management Using LID Technology

18:00 Tuesday 28 May

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Kyungmin Kim (Korea, Republic of) 1; Inkyeong Sim (Korea, Republic of) 1; Jeongeun Won (Korea, Republic of) 1; Okjeong Lee (Korea, Republic of) 1; Jeonghyeon Choi (Korea, Republic of) 1; Sangdan Kim (Korea, Republic of) 2

1 - Division of Earth Environmental System Science (Major of Environmental Engineering), Pukyong National University; 2 - Department of Environment Engineering, Pukyong National University

As climate change and urbanization progress, the water environment in urban areas is changing. The increase in precipitation due to climate change and the increase in impervious areas due to urbanization increase the total stormwater, which again leads to an increase in non-point pollutants and an increase in combined sewer overflows (CSOs), which pollute urban rivers. The purpose of this study is to investigate whether it is appropriate to apply LID technology as part of urban climate adaptation.

Future precipitation data simulated based on climate change scenarios are input to SWMM to simulate future CSOs of the Oncheon stream basin located in Busan, Korea. An optimal design plan for LID facilities is presented to maintain future CSOs emissions to the present state. For future precipitation data, GCM (MPI-ESM-LR) driven under the RCP 8.5 climate change scenario is dynamically downscaled using RCM (WRF). The Oncheon stream basin (area of 56.28 km2) is divided into 43 sub-watersheds and constructed as SWMM. The Pareto optimization method will be applied to determine the capacity and location of LID facilities, which represents the optimal efficiency for investment.

Acknowledgement: This work is supported by the Korea Environmental Industry & Technology Institute (KEITI) grant funded by the Ministry of Environment (RE201901073).