南汇—奉贤杭州湾北岸岸滩水下岸坡三维EOF分析

本文根据南汇－奉贤杭州湾岸段１９８３～１９９０年１：２．５万水下地形图，在建立地表场数据库基础上，应用三维经验特征函数（ＥＯＦ）方法，对该岸段的水下岸坡进行整体研究，第一特征函数的时空结构反映了８０年代以来该岸段的冲淤基本格局，贡献率达６７．９０％，第二特征函数则反映长江水分沙对杭州湾北岸岸滩影响，贡献率为１１．１７％，研究结果表明地汇－奉贤岸滩在纵向和横向上的冲淤特点，纵向上以半渡港为界，以东呈

A Study on Nearshore Profiles from Nanhui to Fengxian Along the Northe Bank of Hangzhou Bay with 3D-EOF

Based on the data base of digitized maps of nearshore from Nanhui to Fengxian long the north bank of Hangzhou Bay with a scale of 1: 25000 since 1983 to 1990, 3D emiprical orthogonal function (EOF) was first used to study the structure of temporal and spatial variation of the coastal evolution. The basic character of the near shore profiles evolution was expressed by the first emiprical orthogonal function, whose contribution rate was up to 67.90%. The second emiprical orthogonal function, whose contribution rate was 11. 17%, was used to explain the effect of the changes of the Changjiang Estuary on the near shore profiles evolution. It was proved that 3D-EOF was a very useful method to coastal research and the results of the present paper was of important significance to the coatal development and managent of the north bank of Hangzhou Bay.