摘要
对2002年采自苏鲁交界海域的466个表层沉积物样品作了粒度分析和粒度参数计算,并进行了沉积物分类和分布特征的研究,结果表明：（1）研究海域的表层沉积物类型主要为砂、粉砂质砂、砂质粉砂、粘土质粉砂和砂-粉砂-粘土5种.（2）研究海域的表层沉积物主体是砂,随着离岸距离的增大,砂含量将逐渐增加然后又逐渐减少.砂含量的经、纬向分带性不明显.粉砂与砂的平面分布特征正好相反,粘土含量的平面分布特征与粉砂相似.（3）研究海域表层沉积物的平均粒径为0.34～7.30 φ,平均为4.09 φ,沉积物颗粒的直径总体上为细砂粒径;分选系数为0.34～4.26 φ,平均为2.10 φ,分选差;偏态为-0.41～0.75,平均为0.29;峰态为0.66～3.69,平均为1.34.（4）根据沉积物中各组分含量、粒度参数、水深、沉积物类型的平面变化特征等,由西向东将研究区分成西部、中部和东部3个分区.由岸向海,西部分区沉积物由粗到细地变化,平均粒径等值线呈NE向与岸线平行分布;东部和中部分区,沉积物粒度变化的规律不明显.
Grain-size analysis and parameter calculation have been carried out based on 466 surface sediments collected from the sea area between Shandong and Jiangsu Provinces. The result shows that the surface sediments of the research area can be divided into 5 types： sand, silty sand, sandy silt, clayey silt, sand-silt-clay. The main composition of sediments in research area is sand, and the content of sand, which does not change with longitude and latitude distinctly, gradually increases and then decreases with the distance away from the coastline. The distribution characteristics of silt in this area, which is similar to clay, is opposite to sand. The mean grain-size （Mz） of sediments in this area is 0. 34 -7.30 Ф, and the average is 4.09 Ф, the grain diameter of the sediments generally belong to fine silt. The coefficient of sorting is 0. 34-4.26 Ф and the average is 2.10 Ф, which shows bad sorting. Skewness is -0. 41-0. 75, and the average is 0. 29. Kurtosis is 0.66 -3.69 and the average is 1.34. The research area can be divided into 3 divisions which are western, middle and eastern area from west to east, based on the contents of sand, silt, and clay, grain-size parameter, water depth and the various characteristics of sediments types. In the western area, the grain-size of sediments transforms from coarse to fine, and the isoline of mean grain-size （Mz） nearly parallels the coastline in the NE orientation..In the eastern and middle area, the variation rule of the sediments grain-size is not obvious.
出处
《海洋学研究》
北大核心
2006年第3期41-52,共12页
Journal of Marine Sciences
基金
科学技术部资助项目(2004DIB3J086)
908专项资助项目(908-02-05-03)
关键词
苏鲁交界海域
表层沉积物
粒度分析
沉积物类型
sea area between Shandong and Jiangsu Provinces
surface sediments
grainsize analysis
types of sediment
