青岛唐岛湾潮间带沉积物粒度及水动力

GRAIN SIZE OF INTERTIDAL DEPOSITS IN TANGDAO BAY OF QINGDAO AND ITS HYDRODYNAMIC SIGNIFICANCE

唐岛湾为半封闭狭长型海湾，水动力条件复杂。对湾内潮间带沉积物进行定点定时取样，并进行粒度测试。分析表明：沉积物以砂和粉砂质砂为主，分选较差，偏度正偏，呈宽峰态；概率累积曲线以两跳一悬式为主。利用粒级一标准偏差曲线研究现代沉积，沉积物中粒径〈158．6μm的组分受潮流影响显著，158．6～369．1μm和〉369．1μm的粒级组分则分别代表波浪和强水动力如风暴浪等的作用；且通过对备粒径组分的分析认为，粒径〈158．6μm的组分中潮汐作用的月周期性最为明显。在狭长型海湾中，潮流水动力强度可能并不大。最后结合相关资料，对唐岛湾内潮坪沉积、潮沟变化及沉积物冲淤变化进行了分析，以期对半封闭狭长型海湾潮间带沉积水动力研究及实施海岸带保护提供基础资料。

The Tangdao Bay is a narrow and semi-enclosed one with complex hydrodynamic conditions. Samples were collected in the intertidal zone at fixed sites and times. We discussed the depositional characteristics and hydrodynamic conditions of the sediments in this paper based on grain size data. The sediments in this area are mainly composed of wide kurtosis. Probability cumulative curves show ments with two saltation peaks and one suspension silty sand with poor sorting, positive skewness and that the deposits are dominated by the type o~ sedi- peak. Combined with the grain size-standard devia- tion curves, it is concluded that the environmentally sensitive grain-size components 〉158.6μm are basically influenced by tidal currents, whereas the sediments between 158.6~369.1 gm and 〉369.1 μm respectively are contributed by waves and storm waves. By the study of the components 〉158.6μm, the monthly tidal cyclicity can be easily recognized. Finally, it is carried out the study of the dep- osition of tidal deposits, changes in tidal creek and erosion and/or siltation of the tidal deposits of the research area, so as to better understand the hydrodynamic conditions in a semi-enclosed and narrow bay as such and the protection of coastal zones.