The application of GPR to barrier-lagoon sedimentation study in Boao of Hainan Island |
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| Authors: | YIN Yong ZHU Dakui TANG Wenwu Martini I Peter |
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| Institution: | 1. The Key Laboratory of Coast and Island Development, Nanjing University, Nanjing 210093, China|
2. Dept. of Land Resource Science, University of Guelph, Ontario, Canada NIE 4E5 |
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| Abstract: | Sedimentary successions and internal structure of the coastal barrier-lagoon system of Boao, eastern Hainan Island were studied through utilizing data from test holes and trenches and ground-penetrating-radar (GPR) profiles. During late Pleistocene, fluvial and delta plains developed over an unevenly eroded bedrock during low sea level stand, followed by the formation of littoral and lagoon facies and defined coastal barrier-lagoon-estuary system during the post-glacial uppermost Pleistocene-lower Holocene eustatic rise of the sea level, and the upper Holocene high stand. GPR results show that Yudaitan, a sandy coastal bar backed by a low-laying land (shoal) just east of the active lagoon, is a continuous, parallel and slightly-wavy reflectors indicating homogeneous sandy or sandy gravel sediments, and inclined reflectors partly caused by progradation and accumulation of beach sand and gravel. Quasi-continuous, hummocky and chaotic reflectors from the shoal of Nangang village correspond to mixed accumulation of sands and clay. This research indicates the GPR is a non-intrusive, rapid, and economical method for high-resolution profiling of subsurface sediments in sandy gravelly coast. |
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| Keywords: | barrier-lagoon system shoal sedimentary succession GPR reflector configuration Boao |
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