Numerical Simulation for Coastal Area Inundation and its Application

Many extreme sea level rise events, such as tsunami and surges, caused by abnormal climate change results sea level rise to frequent and serious flooding at coastal basins. The Typhoon Mamie resulted 200M US dollars property damage, 3 thousand family refugees, and 14 victims at Changwon city in 2003.  Furthermore, it is expected that the extreme sea level rise events due to abnormal climate change might be getting frequent and serious as times go by.

In this study, a numerical simulation and analysis of flood inundation in a small-scale coastal area had been carried out. The applied numerical model adopts two-D finite volume method with a well-balanced HLLC(Harten–Lax–Van Leer contact) scheme. The calibration was performed with comparison between simulation results and real inundated records of Changwon city during the typhoon “Maemi” in September 2003.

The model was developed to provide overflow simulation capability of parapet wall along coastal line as boundary conditions. Inundation scenarios were simulated with various parapet wall heights and analyzed the efficiency of disaster prevention measures from inundation due to sea level rise.

Numerical inundation simulation study showed efficiency of parapet walls along coastal line as one of the structural measures. It was found that the inundation volume could be reduced with respect to non-parapet wall by providing parapet wall along coastal line. In addition, the economic analysis between damages due to inundation and construction cost for parapet wall was performed for optimal disaster prevention design.

Acknowledgement: This work was supported by Korea Environment Industry & Technology Institute(KEITI) though Water Management Research Program, funded by Korea Ministry of Environment(MOE)(79608). and Korean NRF (2019R1A2C1003604)