福建诏安湾海域表层沉积物粒度特征及输运趋势分析

通过对诏安湾海域6个站位的水文泥沙观测和181个表层沉积物样品的粒度分析,结合海湾水深地形,应用Gao?Collins粒径输运模型和系统聚类分析方法,分析研究了福建诏安湾海域的粒度参数分布特征、表层沉积物的运移趋势和沉积环境划分及其动力机制.结果表明,诏安湾表层沉积物共6种类型,以黏土质粉砂和砂为主,平均粒径介于0.5...

Surface sediment grain size characteristics and transport trend analysis in Zhao'an Bay, Fujian

The grain size distribution characteristics,the surface sediment transport trend,the sedimentary environment partition and dynamic mechanism in Zhao'an Bay were investigated with hydrodynamic observation at 6 sites,surface sediment grain size data of 181 samples and topographical data,using Gao-Collins particle size transport model and system clustering analysis.The results show that 6 types of sediments,mainly included clayey silt and sand,were found in Zhao'an Bay,where their particle sizes range from 0.54φto 7.43φwith average 5.85φ.The grain size is coarser in shallow water of the bay head and finer in deep waters at the bay mouth and the coarsest particles were found in the tidal channel at the bay mouth.Affected by multiple factors such as waves,tidal currents,runoff,topography etc.,sediments at the bay mouth generally transport from the outer sea into the bay in direction to the northeast.Sediments in the southern middle part of the bay transport obviously from the shore to the waterways in the bay center.The sediment transport trend in the northern middle part is not clear.The sediments in the bay head show an obvious transportation toward the south.Considering the hydrodynamic conditions,geomorpholo-gical characteristics and sediment sources,4 types of sedimentary environments can be distinguished,namely the bay mouth tidal channel landform,the bay middle tidal flat landform,the bay mouth nearshore shoal landform and the bay head tidal channel landform.