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Coastal geomorphic evolution at the Denglou Cape, the Leizhou Peninsula

Acta Oceanologica Sinica 2002年第4期21卷 597-611页

作者： Wang Lirong(王丽荣) Zhao Huanting(赵焕庭) Song Chaojing(宋朝景) Yuan Jiayi(袁家义) Yu Hongbing(于红兵) South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Department of Geoscience Zhongshan University Guangzhou 510275 China South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

The Denglou Cape, southwest of the Leizhou Peninsula, is the most typical tropical coast in the continent of *** coastal geomorphic development basics of the geology and Quaternary environment change are discussed. Aerial photograph interpretation with fieldwork is applied to draw the outlines of geomorphic types. Based on the investigative data, the exogenic forces and marine organism conditions concerning tropical coast development in the area are expounded, and coastal dynamo-deposition geomorphic bodies are analysed, mainly with sea cliff-abrasion platform,barrier-lagoon system, modern beach, coral reef and mangrove tidal flat, and the general process of coastal evolution at this area, as well as coastline changes since middle Holocene transgression.

关键词： Tropical coastal geomorphology coral reef mangrove tidal flat barrier-lagoon system cape Leizhou Peninsula view of turf management,a comprehensive assessment indices system for turf quality is proposed,i.e.,landscape quality assessment

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The application of GPR to barrier-lagoon sedimentation study in Boao of Hainan Island

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Journal of Geographical Sciences 2002年第3期12卷 313-320页

作者： YIN Yong, ZHU Dakui, TANG Wenwu, Martini I. Peter(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) The Key Laboratory of Coast and Island Development Nanjing University Nanjing China Dept. of Land Resource Science University of Guelph Ontario Canada

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.

关键词： barrier-lagoon system shoal sedimentary succession GPR reflector configuration Boao

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