DOI: 10.1016/j.palaeo.2016.04.046
论文题名: Ancient high-energy storm boulder deposits on Ko Samui, Thailand, and their significance for identifying coastal hazard risk
作者: Terry J.P. ; Oliver G.J.H. ; Friess D.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 454 起始页码: 282
结束页码: 293
语种: 英语
英文关键词: Coastal boulders
; Coastal geomorphology
; Ko Samui
; Sea-level change
; Storm waves
; Thailand
; Typhoons
英文摘要: Coastal geomorphic processes associated with high-energy storm events are difficult to estimate over recent geological history, though their frequency and magnitude are important to assess in order to understand present-day coastal vulnerability. Studying ancient coastal boulder deposits can shed light on the previous physical conditions necessary for their deposition. In this study, we estimated the physical processes required to move reef-derived coral boulders on the east coast of Ko Samui, a rapidly developing tourist island off eastern peninsular Thailand. The position and dimensions of 97 coral boulders (weight: mean 2.9. t, max. 12.7. t; transport distance: max. 125. m) were measured at two sites and dated using uranium/thorium methods. Flow velocities of 2.3-8.6. m/s were required to transport the measured boulders, with individuals deposited up to 4.7. m above mean sea level. Age-dating suggests that events capable of the highest flow velocities occurred around AD 1600 and AD 1750. These were probably driven by tropical cyclones (typhoons). Boulder transport by events of similar magnitude has not been detected within the last 250. years. The non-occurrence of similar events in living memory has implications for hazard perceptions at this important tourist destination. However, there is also evidence of substantial Holocene sea-level changes in the Gulf of Thailand, as observed at nearby Ko Phaluai. This potentially offers a challenge for the interpretation of older boulders dating from the mid-Holocene, as sea level may have been more than 2. m higher than present. 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. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68402
Appears in Collections: 过去全球变化的重建
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作者单位: College of Sustainability Sciences and Humanities, Zayed University, Academic City, PO Box 19282, Dubai, United Arab Emirates; Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore; Department of Geography, National University of Singapore, 1 Arts Link, Singapore, Singapore
Recommended Citation:
Terry J.P.,Oliver G.J.H.,Friess D.A.. Ancient high-energy storm boulder deposits on Ko Samui, Thailand, and their significance for identifying coastal hazard risk[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,454