摘要
江苏淤泥质潮滩属于有大-中潮差的开敞或半开敞潮滩。根据多断面昼夜水文观测,本文分析了潮滩潮流及悬移质沉积物的分布及变化,并与荷兰瓦登海(Waddenzee)等处淤泥质潮滩进行了对比。作者指出著名的延迟机制在开敞或半开敞的强潮潮滩上的适用性和局限性,发现潮滩上有水沙的水平余循环及类潮流椭圆,认为广阔的潮滩可以分成相对独立的一系列沿岸单元。
The prograding tidal mud flat in Jiangsu Province is perhaps the widest and longest in China.It belongs to the open(north part)or semi-open(south part)tidal flat and is of moderate-high tidal range.This paper deals with four profiles of tidal mud flat in Jiangsu Province.A 25-hours survey of the whole tide hydrography was carried out for each profile.Based on these investigations,the paper analyses the characteristics of tidal current and concentration of suspended sediment on tidal mud flat.It has been found that the distribution of concentration of suspended sediment is different from that of current velocity along the profiles,the concentration of suspended sediment is the highest near low water line but decreases toward the sea.and the high water line,however the velocity decreases from offshore to high water line.The tidal current is rectilinear in offshore tidal channel,but rotary on tidal mud flat;and the direction of residual transport of water and sediment on upper intertidal zone contrasts strikingly with that on lower intertidal and subtidal zone.The lag mechanism can explain some features,but not all the main phenomenons of sedimentary processes taking place on tidal flat in Jiangsu Province unless introducing wave and storm surge effect.It is notable that the horizontal residual circulation of water and suspended load is present on tidal flat.As a result,the wide tidal mud flat is divided into a series of longshore cells which form individual dynamic units.
作者
张忍顺
Zhang Renshun(Nanjing University)
出处
《海洋与湖沼》
1986年第3期235-245,共11页
Oceanologia Et Limnologia Sinica
