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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Assessing vulnerability of riverbank revetments in a regional drainage system during storm or typhoo...
Assessing vulnerability of riverbank revetments in a regional drainage system during storm or typhoon events
Author : YING-TIEN LIN (1), JINN-CHUANG YANG (2), SHENG-HSIANG HUNG(2), SHIH-WEI CHIANG(2), YIN-LUNG CHANG(2)
ABSTRACT
In this study, a quasi three-dimensional hydrodynamic model and field measurements were combined to assess the
vulnerable segments of the De-Shang Creek drainage system during the 610 flood and Typhoon Kong-Ray. An
automatic monitoring system was installed to record channel water levels, and the displacement and pore water
pressure variations inside the riverbank revetments. The results show that the variations of water levels and pore water
pressure were almost at the same pace, which indicates the drainage system inside the revetments work well. The flowinduced
lateral shear stress and safety factor (S.F.) of river embankments from numerical simulations are the two
indexes used to assess the vulnerability of the riverbank revetments. By using the 610 flood and Typhoon Kong-Ray as
test cases, the combined hydrodynamic and revetment stability model is able to indicate if riverbank revetments are in
danger during the storm or typhoon events. In the observational site, the damages of the revetments in the 610 flood
may be due to the exceedance of the flow-induced shear stress over the critical resistance shear stress of the
revetments. Overall, this study show the combined hydrodynamic and revetment stability model is a useful nonengineering
method on assessing stability of riverbank revetments during storm or typhoon events.
File Size : 787,060 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 28/08/2015
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