Advantages of beachrock slabs for interpreting high-energy wave transport: Evidence from Ludao Island in south-eastern Taiwan

Lau, A Y Annie, Terry, James P, Switzer, Adam D and Pile, Jeremy (2015) Advantages of beachrock slabs for interpreting high-energy wave transport: Evidence from Ludao Island in south-eastern Taiwan. Geomorphology, 228 263-274. doi:10.1016/j.geomorph.2014.09.010


Author Lau, A Y Annie
Terry, James P
Switzer, Adam D
Pile, Jeremy
Title Advantages of beachrock slabs for interpreting high-energy wave transport: Evidence from Ludao Island in south-eastern Taiwan
Journal name Geomorphology   Check publisher's open access policy
ISSN 0169-555X
1872-695X
Publication date 2015-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.geomorph.2014.09.010
Open Access Status Not Open Access
Volume 228
Start page 263
End page 274
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Powerful typhoons frequently affect eastern Taiwan. On Dabaisha beach on the SW coast of Ludao Island, a small volcanic island lying SE off mainland Taiwan, the presence of numerous beachrock slabs provides evidence of the sediment transport capabilities of high-energy waves generated by these storms. With a well-defined beachrock source from which the slabs were derived, it is easy to differentiate clasts transported in run-up or backwash flow based on their current position relative to the outcrop. In order to estimate the wave-generated flow velocities from the measured beachrock slabs, the hydrodynamic equations for boulder transport by Nandasena et al. (2011) have been rearranged so that they are appropriate for this particular geomorphic setting, where exposed in situ beachrock outcrops liberate clasts which may then be transported either by run-up onto the beach or backwash flow onto adjacent reef platforms. Such settings are common on tropical coastlines with fringing coral reefs and beaches comprising mostly biogenic sediments. In the Dabaisha beach case, the lowest flow velocities required to transport all measured beachrock slabs from their source outcrop to current positions are 2.18–3.16 m/s for run-up and 1.76–3.24 m/s for backwash. With a discussion of advantages and limitations on the use of beachrock clasts for interpreting wave behaviour, this paper presents another proxy for studying high-energy wave events that is highly suitable for certain carbonate-rich coastlines.
Keyword Geography, Physical
Geosciences, Multidisciplinary
Physical Geography
Geology
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID NRF-RF2010-04
FY2012-FRC2-005
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Non HERDC
 
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Created: Wed, 06 Apr 2016, 22:43:02 EST by Annie Lau on behalf of School of Geography, Planning & Env Management