Amuping Desilting Tunnel in the Shihmen reservoir will complete and operate in 2020. These extra sediment flushing will change the flow and sediment discharge conditions in rivers. On the other hand, Climate change will lead that the intensity of extreme rainfall will increase enormously in the future. Therefore, the extreme rainfall and extra sediment flushing will challenge the existing flood control facilities. This study aims to discuss the flood control and riverbed migration for the Tahan and Tamsui rivers in the future considering the effect of climate change and the Amuping Desilting Tunnel. Our results show that under the RCP 8.5 climate change scenario, the projected peak discharge during the end of 21th century (2075 to 2099) will be at least 50% higher than that in the baseline (1979 to 2003) period. In terms of flood control, the potential of overbank will increase in the downstream area in the future. The flushing of Amuping Desilting Tunnel has limited impact on riverbed migration in the Tahan and Tamsui rivers and the trend of long-term change of riverbed in the future is dominated by degradation.
|Translated title of the contribution||Tamsui River Flood Control and Riverbed Migration Under Climate Change|
|Original language||Chinese (Traditional)|
|Number of pages||10|
|Journal||Journal of the Chinese Institute of Civil and Hydraulic Engineering|
|State||Published - 1 Jun 2019|