福建福宁湾表层沉积物粒度特征及沉积动力环境分区  

Grain size characteristics of surface sediments and subdivisions of dynamic sediment environment in Funing Bay,Fujian Province

作　　者：郭俊杰 胡日军[1,2] 陈娟娟 李毅 陈晓磁 朱龙海[1,2] 孟令鹏 GUO Junjie;HU Rijun;CHEN Juanjuan;LI Yi;CHEN Xiaoci;ZHU Longhai;MENG Lingpeng(College of Marine Geosciences,Ocean University of China,Qingdao»266100;Key Laboratory of Submarine Geosciences and Prospecting Technique,Ministry of Education,Qingdao 266100;Huaneng Xiapu Nuclear Power Co.,Ltd.,Ningde,352000)

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352000

出　　处：《海洋湖沼通报》2021年第5期50-59,共10页Transactions of Oceanology and Limnology

基　　金：霞浦核电海岛厂址开发利用研究(HNKJ20-H18)。

摘　　要：根据福宁湾73个表层沉积物粒度资料,分析其粒度特征和沉积物类型,结合粒度参数和水动力参数,利用聚类分析方法探讨了其沉积动力环境特征。结果表明,研究区表层沉积物类型以泥和砂质泥为主,中值粒径Φ变化范围较小(6.19~8.33),均值为7.55,分选较差,负偏到近对称。研究区大潮和小潮期间近底部流速(BCS)变化范围分别为0.6~89.3 cm/s和0.4~39.8 cm/s,均值为31.1 cm/s和14.9 cm/s,标准偏差为10.5 cm/s和5.4 cm/s。根据中值粒径、分选系数、近底部流速和水深4个参数将研究区沉积动力环境分为三类:第Ⅰ类沉积区,粒度相对较粗,粉砂含量超过50%的区域分布范围最广,波浪作用较强;第Ⅱ类沉积区,粒度最细(中值粒径为7.96),黏土含量最高,水动力环境最弱;第Ⅲ类沉积区,粒度相对较粗,砂含量偏高,水动力较强;总体而言,研究区沉积动力环境呈现为两侧较强而中间较弱的特征。Grain size characteristic and sediment types are studied based on 73 surface sediments in the Funing Bay.With grain size and hydrodynamic parameters,the characteristic of dynamic sediment environment in the Funing Bay is analyzed applying cluster analysis.The result shows that the surface sediments in the Funing Bay are characterized by sandy mud and mud.Median size varies in a narrow range(Φ=6.19~8.33),with an average of 7.55,poorly sorted,skewness changes from negative to nearly symmetric.The bottom current speed(BCS)during spring and neap tide varies from 0.6~89.3 cm/s and 0.4~39.8 cm/s,the averages are 31.1 cm/s and 14.9 cm/s,and the standard deviations are 10.5 cm/s and 5.4 cm/s,respectively.According to median size,sorting coefficient,water depth and BCS,dynamic sediment environment in the study area can be classified into 3 different zones:Ⅰ)the grain size is relatively coarse,the distribution of the area in which silt account for over 50%is the largest,and the wave condition is strong;Ⅱ)the grain size is the finest(median size is 7.96),the clay content is the highest,the hydrodynamic environment is the most weakest;Ⅲ)the grain size is relatively coarse,the sand content is relatively high,and the hydrodynamic condition is strong.Hence,the dynamic sediment environment in the study area is strong in both ends areas and weak in the middle area.

关 键 词：福宁湾 表层沉积物 粒度特征 聚类分析 沉积动力环境 

分 类 号：P736.2[天文地球—海洋地质]