Author(s): Parameshor Pokharel; Makoto Takeda; Naoki Matsuo
Linked Author(s): Naoki Matsuo
Keywords: Rise of sea level; Global warming; Heavy rain; Lag time; Simulation model
Abstract: Rise of sea level and climate change that is underway due to global warming is a common global problem. It is estimated that the sea level rise due to global warming is from 0. 15m to 0. 95m. The rise of sea level varies place to place mainly depend on the thermal expansion of ocean due to global warming. The highly urbanized coastal cities are suffering from the frequent water disaster due to heavy rain and typhoon. Now the phenomenon of global warming was considered during inundation simulation. A synthetic simulation model is applied for the analysis of inundation scenario. The model includes 1D river model 2D sea model based on shallow water equation, 2D urban model based on unstructured grid and a sewer model. The analysis region is Nagoya port, Nagoya city and rivers passing through densely populated city which are terminated into Pacific Ocean. For this analysis two cases are considered, one is the case without sea level rise and another case is considering the sea level rise due to global warming. The inundation due to heavy rain of 10 years, 20 years, and 50 years return period is also treated. Inundation scenario at each hour of rainfall and tidal phenomenon for 12 hours is simulated. Moreover, the maximum inundation occurs at the peak of rainfall overlap with peak of high tide. Finally, it is said that the Nagoya city will suffer from the inundation problem due to global warming. The most affected area is the densely populated city area which lies between Hori River and Nakagawa Canal.
Year: 2007