长江口崇明东滩现代地貌过程实地观测与分析

OBSERVATION AND ANALYSIS OF THE PROCESS OF PRESENT-DAY MORPHOLOGY IN THE CHONGMING TIDAL FLAT OF THE YANGTZE RIVER ESTUARY

根据2002年4月至2003年4月对崇明东滩进行的实地观测,结合遥感影像等资料,可以看出崇明东滩夏季淤积大于冲刷,冬季冲刷大于淤积,季节性冲淤变化北部比中、南部更为显著。由于潮流等作用,潮沟系统由南向北呈现减少趋势,东滩中部发育最快,也是整个崇明岛向海延伸的方向。人类高强度的活动改变了潮滩的自然属性,使潮滩自然分布发生变化。

From observing and analyzing the Chongming tidal flat from 2002 to 2003,together with the information from remote sensing and film pictures, we can come to the following conclusion:deposition is more than erosion in the summer and the thing is opposite in the winter.It is more evident in the north than in the middle and the south of the Chongming tidal flat.Under the action of tidal current, the number of tidal creeks reduces gradually from the south to north. The middle develops relatively fast and the Chongming Island extends mainly in this direction. Human activity is so strong that it begins to play an important pole in changing the nature and the distribution of the tidal beach.