【摘要】 本文通过对舟山地区高波能、中等潮差滨岸带的研究指出:(1)滩脊(坝)沟槽体系是卷跃浪产生的涡流作用下形成的;(2)滩脊(坝)沟糟体系形成后,主要在上冲流加积作用下向岸迁移;(3)迁移系根据它所处的滨岸位置、水动力特征、微地貌形态和沉积构造划分四个阶段,即初始形成阶段;板状前积纹层发育阶段;冲洗沙坝发育阶段和滩肩形成阶段。 本文还讨论了滩脊(坝)沟槽体系垂向层序特征和保存情况,这将为寻找类似的古代沉积物提供某些依据。更多还原

【Abstract】 A detailed study of high-wave energy, mesotidal coast located in Zhoushan Archipelago has shown that: (1) a ridge (bar) and runnel system is formed by vortices generated by the plunging breaker; (2) after being formed, ridge (bar) and runnel system migrates landward mainly under the accretion of an uprush current; (3) according to the position of a ridge (bar) on the coast, hydrodynamic features, microgeomorphy and sedimentary structures, the landward migration of ridge may be divided into four stages, i.e. initial formation stage of ridge (bar); developmental stage of tabular foreset laminae; developmental stage of swash bars; and formative stage of berm.Finally, this paper discusses the vertical sequence ,of a ridge (bar) and runnel system and its preservation. These may provide some evidences for analysing and comparing similar ancient sediments.更多还原