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福建诏安湾海域表层沉积物粒度特征及输运趋势分析
束芳芳
0
(自然资源部第三海洋研究所,福建 厦门 361005)
摘要:
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0.54~7.43 φ之间,均值为5.85 φ,除湾顶潮汐水道外,大体呈自湾顶浅水区向湾口深水区变粗的分布趋势,以湾口的潮汐通道最粗。受波浪、潮汐潮流、径流、水下地形等多种因素的共同影响,湾口区域总体表现为从外海向湾内输沙,输运方向指向东北;湾中偏南部呈明显的自岸边向湾中水道汇聚的运移趋势,偏北部沉积物输运趋势不明显;湾顶区域表现为明显的沉积物向南输运。根据水动力作用条件、地貌特征和沉积物来源的不同,诏安湾可划分为4类沉积环境,分别为湾口潮汐通道地貌、湾中潮滩地貌、湾口近岸浅滩地貌和湾顶潮汐水道地貌。
关键词:  海洋地质学  潮流泥沙运动  粒度特征  输运趋势  沉积环境  诏安湾
DOI:10.3969/J.ISSN.2095-4972.2022.01.015
基金项目:自然资源部第三海洋研究所基本科研业务费资助项目(20170305,2011010)
Surface sediment grain size characteristics and transport trend analysis in Zhao'an Bay, Fujian
SHU Fangfang
(Third Institute of Oceanography, MNR, Xiamen 361005, China)
Abstract:
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 0.54 φ to 7.43 φ with average 5.85 φ. 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, geomorphological 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.
Key words:  marine geology  current and sediment movement  grain size characteristics  transport trend  sedimentary environment  Zhao'an Bay

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