烟台芝罘湾底质沉积物粒度特征和沉积动力环境研究

Study on Grain Size Characteristics of Surface Sediments and Sedimentary Dynamic Environment in Zhifu Bay in Yantai City

摘要:

根据芝罘湾海域110个底质沉积物样品粒度分析结果，对沉积物类型和粒度参数分布进行了总结。在此基础上，利用粒径趋势分析模型（GSTA）和沉积动力判别图解，探讨了底质沉积物的运移趋势及沉积水动力规律。研究表明，芝罘湾海域底质沉积物类型共有8种，其中砂质泥、砂质粉砂、泥和粉砂分布最广泛；平均粒径值具有从岸向海逐渐增大的趋势，分选性、偏度和峰度分别为差、正偏—极正偏、平坦—中等的特征；粒度运移趋势分析反映出套子湾泥沙向西、西南运移，芝罘湾及以东海域泥沙呈顺时针方向运移；沉积动力判别图解揭示出芝罘湾海域沉积水动力具有整体较弱的特征。

Abstract:

According to the results of 110 surface sediment samples in the sea area in Zhifu bay, sediment types and distribution of grain size parameters have been summarized. On these basis, by using GSTA model and discrimination diagram of sedimentary dynamics, the migration trend of sediment and the hydrodynamic law of sediment have been studied. It is showed that all samples can be classified into eight types. Sandy mud, sandy silt, mud and silt are most widely distributed. The grain size of the sediment is more and more big from shore to ocean. Other grain size parameters are poorly sorted, positiveskewed and very positiveskewed, flat kurtosis and mesokurtic distribution respectively. In Taozi Bay, the sediment is transported from east to west and from northeast to southwest，but in Zhifu Bay, the sediment is transported in a clockwise direction. The discrimination diagram of sedimentary dynamics reveals that the sedimentary hydrodynamics in Zhifu Bay is weak as a whole.