近50年来杭州湾七姊八妹列岛海域海床演变剖析

  Qizibamei Islands sea is located in Huibieyang sea of southern Hangzhou Bay.Most of the seabed is gen-tle,in addition to some deep holes around islands and reefs.In order to explore the seabed evolution of the sea are-a,based on the knowledge of water and sediment characteristics of Hangzhou Bay,the characteristics of hydrody-namic,suspended sediment and seabed material distribution are analyzed.Comparison study on charts from differ-ent periods shows that the offshore water is shallower because of human activities and engineering constructions, where it is in a state of deposition and of silting beach.The area far away from the shore is in a balancing state of scouring and silting because sediment is difficult to silting by the tidal movements.Between 1962~2008,Qizibam-ei Islands sea presents scouring and silting zone interval to coincide with the shoreline.The mean deposition thick-ness is about 2.2 m and deposition rate is about 5.0 cm/a.In most areas,the mean erosion thickness is about 2.4 m and erosion rate is about 5 .0 cm/a.These features are consistent with the local hydrodynamic conditions and sediment characteristics.

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