福宁湾及附近海域悬沙粒度与影响因素  

Suspended sediment grain size and influencing factors in Funing Bay and its nearby sea areas

作　　者：毕云天 胡日军[1,2] 陈娟娟 李毅 伊兆晗 陈晓磁 朱龙海[1,2] 尹砚军 刘波 BI Yuntian;HU Rijun;CHEN Juanjuan;LI Yi;YI Zhaohan;CHEN Xiaoci;ZHU Longhai;YIN Yanjun;LIU Bo(College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao 266100,China;Huaneng Xiapu Nuclear Power Co.,Ltd,Ningde 352100,China)

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266100 [2]中国海洋大学海底科学与探测技术教育部重点实验室,青岛266100 [3]华能霞浦核电有限公司,宁德352100

出　　处：《海洋地质与第四纪地质》2024年第1期15-29,共15页Marine Geology & Quaternary Geology

基　　金：中国华能集团有限公司总部科技项目“霞浦核电海岛厂址开发利用研究”(HNKJ20-H18);国家自然科学基金项目“山东半岛海湾对泥沙的捕获机制——以威海湾为例”(41776059)。

摘　　要：基于闽北福宁湾及附近海域冬、夏两季水文泥沙实测数据,分析了不同时间尺度下悬沙的粒度特征,探讨了影响悬沙粒度季节差异的主要因素以及悬沙粒度与浓度的关系。结果表明:正常天气下,研究区悬沙中值粒径普遍大于6.5Φ。悬沙粒度具有“冬细夏粗”的季节分布特征;受潮动力影响,悬沙粒度大小潮变化明显;潮周期内悬沙粒径变化规律不明显。悬沙粒级-标准偏差曲线显示两种主要的敏感粒级分布范围为2.8~3.4μm和21.1~25.1μm。悬沙粒度“冬细夏粗”的季节差异主要受底质再悬浮和泥沙来源的影响。冬季悬沙粒径与浓度的相关性不明显,夏季两者存在显著的线性关系,悬沙粒径随悬沙浓度的增加而减小,这种季节差异可能与悬沙来源和混合作用有关。夏季悬沙粒径的粗化可能与细颗粒发生絮凝沉降有关。Based on the observed hydrological data and sediment in winter and summer in the Funing Bay and its nearby sea areas in the northern Fujian,South China,we analyzed the characteristics of suspended sediment grain size at different time scales,discussed the main factors affecting the seasonal variation of grain size,and revealed the relationship between grainsize and concentration.Results show that in normal weather,the median grain size is generally larger than 6.5Φin the study area.The grain size shows seasonal distribution characteristics:being fine in winter and coarse in summer.Under the influence of tidal power,the grain size changes significantly between spring and neap tides.The variation of grain size in tidal cycle is not obvious.The standard deviation of grain size curve shows that the distribution ranges of two main sensitive grain size are 2.8~3.4μm and 21.1~25.1μm.The seasonal variation in grain size is mainly affected by sediment resuspension and source supply.Correlation between median grain size and concentration in winter is not obvious,but there is a significant linear relationship between them in summer.With the increase of concentration,the grainsize becomes finer.This seasonal variation may be related to the sources and mixing of suspended sediment.The coarsening of grain size in summer may be related to the flocculation settling of fine particles.

关 键 词：悬沙粒度 时空变化 季节差异 影响因素 福宁湾 

分 类 号：P736[天文地球—海洋地质]