Browsing by Author "Cheng, Chao-Tzuen"

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Estimating the Risk of River Flow under Climate Change in the Tsengwen River Basin
(2016-03-01)
Wei, Hsiao-Ping
;
Yeh, Keh-Chia
;
Liou, Jun-Jih
;
Chen, Yung-Ming
;
Cheng, Chao-Tzuen
This study evaluated the overflow risk of the Tsengwen River under a climate change scenario by using bias-corrected dynamic downscaled data as inputs for a SOBEK model (Deltares, the Netherlands). The results showed that the simulated river flow rate at Yufeng Bridge (upstream), Erxi Bridge (midstream), and XinZong (1) (downstream) stations are at risk of exceeding the management plan's flow rate for three projection periods (1979-2003, 2015-2039, 2075-2099). After validation with the geomorphic and hydrological data collected in this study, the frequency at which the flow rate exceeded the design flood was 2 in 88 events in the base period (1979-2003), 6 in 82 events in the near future (2015-2039), and 10 in 81 events at the end of the century (2075-2099).
Levee Overtopping Risk Assessment under Climate Change Scenario in Kao-Ping River, Taiwan
(2020-06-01)
Wei, Hsiao-Ping
;
Su, Yuan-Fong
;
Cheng, Chao-Tzuen
;
Yeh, Keh-Chia
;
土木工程學系
With the growing concern about the failure risk of river embankments in a rapidly changing climate, this study aims to quantify the overtopping probability of river embankment in Kao-Ping River basin in southern Taiwan. A water level simulation model is calibrated and validated with historical typhoon events and the calibrated model is further used to assess overtopping risk in the future under a climate change scenario. A dynamic downscaled projection dataset, provided by Meteorological Research Institute (MRI) has been further downscaled to 5-km grids and bias-corrected with a quantile mapping method, is used to simulate the water level of Kao-Ping River in the future. Our results highlighted that the overtopping risk of Kao-Ping River increased by a factor of 5.7 similar to 8.0 by the end of the 21st century.