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Climate Change 2016
October 27-29, 2016
Volume 7, Issue 9(Suppl) J Earth Sci Clim Change
ISSN: 2157-7617 JESCC, an open access journal
conferenceseries .com
October 24-26, 2016 Valencia, Spain
World Conference onClimate Change
Storm risk based on stranded coral boulders and sea level changes around Thailand since the mid-Holocene
Grahame Oliver1 and James Terry2
1Nanyang Technological University, Singapore
2Zayed University, UAE
The west coast tourist beaches of peninsular Thailand are vulnerable to tsunamis originating from the Sumatra-Andaman
subduction zone. The east coast beaches of peninsular Thailand are thought to be safe from tsunamis. However, our
investigations of stranded coral boulders on Koh Samui suggest that east coast tourist beaches are vulnerable to typhoon storm
induced inundations. We have estimated the physical processes required to move reef-derived coral boulders on the eastern
coast of Koh Samui. Flow velocities of 2.3-8.6 m/s were required to transport the boulders, with individuals deposited up to 4.7
m above mean sea level. U-Th and 14C age-dating of coral boulders, suggest that events capable of the highest flow velocities
occurred around AD 1600 and AD 1750. No events of similar magnitude have been experienced in the last 250 years. The non-
occurrence of similar events in living memory has implications for hazard perceptions at this important tourist destination.
We also presentevidence for Holocene sea-level changes across peninsular Thailand, as observed in raised seanotches in
coastal limestone cliffs at KohPhaluai and near Krabi and in emergent fringing reefs at KohSamui. 14C dating of oyster shells
and stalactites that grew inside the notches suggest that relative mean sea level was ~2 m higher during the mid-Holocene
compared to the present day. Thus, studies using coral boulders as a proxy for past storm-wave conditions must consider the
broader sea-level history and are probably best limited to the period post-2000 BP in the Gulf of Thailand.
Biography
Grahame Oliver has lectured and researched at the Universities of Otago, Cambridge, St Andrews, Curtin, Western Ontario, University College Dublin, National
University of Singapore and at present, at the Asian School of the Environment, Nanyang Technological University, Singapore. He has published over a hundred
papers in geochronology and geodynamics.
Grahame Oliver et al., J Earth Sci Clim Change 2016, 7:9(Suppl)