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Open AccessArticle

Riverbed Migrations in Western Taiwan under Climate Change

1
National Science and Technology Center for Disaster Reduction, No. 200, Sec. 3, Beixin Road, Xindian District, New Taipei City 23143, Taiwan
2
Center for Spatial Information Science, The University of Tokyo, 5-1-5 Kashiwanoha Kashiwa, Chiba 277-8568, Japan
*
Author to whom correspondence should be addressed.
Water 2018, 10(11), 1631; https://doi.org/10.3390/w10111631
Received: 2 November 2018 / Revised: 7 November 2018 / Accepted: 8 November 2018 / Published: 12 November 2018
(This article belongs to the Special Issue Modeling and Practice of Erosion and Sediment Transport under Change)
In recent years, extreme weather phenomena have occurred worldwide, resulting in many catastrophic disasters. Under the impact of climate change, the frequency of extreme rainfall events in Taiwan will increase, according to a report on climate change in Taiwan. This study analyzed riverbed migrations, such as degradation and aggradation, caused by extreme rainfall events under climate change for the Choshui River, Taiwan. We used the CCHE1D model to simulate changes in flow discharge and riverbed caused by typhoon events for the base period (1979–2003) and the end of the 21st century (2075–2099) according to the climate change scenario of representative concentration pathways 8.5 (RCP8.5) and dynamical downscaling of rainfall data in Taiwan. According to the results on flow discharge, at the end of the 21st century, the average peak flow during extreme rainfall events will increase by 20% relative to the base period, but the time required to reach the peak will be 8 h shorter than that in the base period. In terms of the results of degradation and aggradation of the riverbed, at the end of the 21st century, the amount of aggradation will increase by 33% over that of the base period. In the future, upstream sediment will be blocked by the Chichi weir, increasing the severity of scouring downstream. In addition, due to the increased peak flow discharge in the future, the scouring of the pier may be more serious than it is currently. More detailed 2D or 3D hydrological models are necessary in future works, which could adequately address the erosive phenomena created by bridge piers. Our results indicate that not only will flood disasters occur within a shorter time duration, but the catchment will also face more severe degradation and aggradation in the future. View Full-Text
Keywords: aggradation; CCHE1D; climate change; degradation; dynamical downscaling; flow discharge; migration; riverbed; sediment aggradation; CCHE1D; climate change; degradation; dynamical downscaling; flow discharge; migration; riverbed; sediment
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MDPI and ACS Style

Chao, Y.-C.; Chen, C.-W.; Li, H.-C.; Chen, Y.-M. Riverbed Migrations in Western Taiwan under Climate Change. Water 2018, 10, 1631.

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