摘要
海滩沙是砂岛形成的基础,成长初始状态原生态海滩沙是砂岛形成的标志;沿岸沙丘是植被成长屏障,二者都具有重要的研究意义。笔者以2019年科考航次现场海滩沙-沿岸沙丘、砂岛及植被调查与卫星遥感资料分析为基础,对七连屿海滩沙-沿岸沙丘-植被地质特征,形态、位置,它们与砂岛的关系进行讨论;揭示了海滩沙-沿岸沙丘形成不但决定于海浪、潮汐,风暴潮等动力作用,而且也与沉积物搬运过程、沉积作用关系密切;同时探讨了岛屿形成过程中现代植物的分布:从点状发育过渡到逐渐覆盖整个潮上带区域,即先是沿岸沙丘,再是海岛中心,最后呈面状覆盖全岛。其中,植物的定植起到了重要作用,不但能够起到固沙作用,而且参与了砂岛的型成。由此,提出建立七连屿海滩沙-海滩岩-植被-砂岛成因模式。
The beach sand is the material base of a sand island. It is not only the home for sea animals, but also the evidence of the forming process of a sand island. Coastal dunes may act as barriers to protect vegetation from the damage by wave and surge. Both of them have important research significance for protection of a sand island.Based on the field survey on beach sands, coastal dunes and sand islands and vegetation on the Qilianyu Island in the scientific expedition 2019 in addition to the interpretation of satellite remote sensing data, this paper discussed the geological features, morphological characteristics, and geographic positions of the beach sands, coastal dunes and vegetation as well as their relationship to the development of the sand island. It is revealed that the formation of beach-coastal dunes is not only determined by the dynamic actions of waves, tides and storm surges, but also related to the process of sediment transportation and sedimentation. With regard to the formation of sand island,vegetation plays critical roles. It starts from a pattern of spots in the beginning and then gradually expands to the whole supratidal area, and moves from coastal dunes to the center of island, and finally occupies the whole island.In the process, plant colonization plays a key role in sand fixation and sand island formation. Upon the observations mentioned above, a genetic model of beach sand-beach rock-vegetation-sand island in Qilianyu Island is proposed.
作者
王宇喆
邱隆伟
许红
马骁
付和平
WANG Yuzhe;QIU Longwei;XU Hong;MA Xiao;FU Heping(China University of Petroleum(East China),Qingdao 266580,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China;First Institute of Oceanology,Ministry of Natural Resources,Qingdao 266061,China)
出处
《海洋地质前沿》
CSCD
北大核心
2021年第6期92-100,共9页
Marine Geology Frontiers
基金
国家自然科学基金(41872114)
国家科技基础资源调查专项课题(2017FY201407)。
关键词
七连屿
粒度分析
海滩沙
沿岸沙丘
现代植被
Qilianyu Island
grain size analysis
beach sand
coastal dunes
modern vegetation
