The diatom assemblages of surface sediment in tidal beach supply a very important scientific evidence for restoring the paleoenvironment, the changes of shoreline and the sea level.
潮滩表层沉积的硅藻组合研究为利用化石硅藻恢复古环境、岸线变迁、古海面变化提供重要的科学依据。
About six years ago it became an island. Day by day the sea is eating the land — the dam has stopped the sediment of the Nile from replenishing the shoreline.
大约六年前，那地方变成了一个小岛。海水一天天冲刷陆地——水坝已经使得尼罗河的泥沙无法沉积下来加固海岸了。
They are divided into three sediment formations, shoreline-shallow lake, braid lake-deep lake and wind deposition.
可划分为滨线-浅湖、辫河浅湖-深湖和风积三种沉积形态。
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