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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 7- EXTREME EVENTS, NATURAL VARIABILITY AND CLIMATE CHANGE : MECHANISMS OF DAMAGE DURING TYPHOON HAIYAN: STORM SURGE, WAVES, AND “TSUNAMILIKE” SURF BEAT
MECHANISMS OF DAMAGE DURING TYPHOON HAIYAN: STORM SURGE, WAVES, AND “TSUNAMILIKE” SURF BEAT
Author : JEREMY D. BRICKER & VOLKER ROEBER
Typhoons cause damage by a variety of mechanisms: wind, large waves, and storm surge. Storm surge itself has three components: pressure-driven setup (the inverse barometer effect), wind-driven setup (wind pushing water onshore), and breaking-wave-induced setup (breaking waves pushing water onshore). Numerical modeling shows that in the fringing- reef-protected town of Hernani during Typhoon Haiyan, pressure- and wind-driven setup were small, while breaking-wave- induced setup varied in time as the envelope of large and small incident wave groups (sets), resulting in an infragravity oscillation. The surf beat contained energy in a frequency range close to the natural resonant mode of the reef, which amplified the energy of the surf beat (Nakaza and Hino, 1991; Nwogu and Demirbilek, 2010). During propagation over the reef, the amplified surf beat steepened nonlinearly, and impacted the town as a tsunami-like bore, resulting in extensive damage and casualties. Since coastal hazard planning presently relies on phase-averaged wave modeling, infragravity surges such as the one that struck Hernani are not currently being accounted for, highlighting the necessity for a change of policy and the adoption of phase-resolving wave models in regions protected by fringing coral reefs.
File Size : 797,352 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 7- EXTREME EVENTS, NATURAL VARIABILITY AND CLIMATE CHANGE
Date Published : 20/04/2016
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