威海市东部滨海新城北部海域沉积物分布特征及沉积环境分析

Analysis on Sediment Distribution and Sedimentary Environment in the Northern Coastal New City in Eastern Weihai City

摘要:

为研究威海东部滨海新城北部海域沉积环境，本文通过采集区内50个海底表层样，采用移液管法和筛析法进行沉积物粒度分析，在此基础上划分了沉积物类型；采用矩值法计算了粒度参数，研究了各种类型沉积物的分布规律，阐述了其与物质来源和沉积动力的关系。结果表明，研究区沉积物平均粒径在0.04～3.23 mm之间，平均值为0.18 mm；分选系数在1.30～4.70之间；偏度在1.21~3.42，平均值为1.79；峰度值在1.97~8.82之间，平均值为3.97。通过对粒度参数分布特征及沉积环境的研究分析发现，研究区粒级组分含量的分布与沉积物类型分布特征吻合度好，总体表现出离岸越远，沉积物粒度逐渐变细的趋势；同时，研究区海底表层沉积物的分布特征主要受物源和水动力条件的影响。

Abstract:

In order to study sedimentary environment in the northern coastal new city in eastern Weihai city, through collecting 50 seabed surface samples, by using pipette and sieve analysis methods, sediment particle size has been analyzed. Based on this, sediment types have been classified. The particle size parameters have been calculated by using the moment method, the distribution patterns of various types of sediments have been studied, and the relationship with material sources and sedimentary dynamics has been expunded. It is showed that the average particle size of sediments in the study area is 0.04~3.23mm, the average value is 0.18mm, the sorting coefficient is 1.30~4.70, the skewness ranges from 1.21 to 3.42, with an average value of 1.79. The kurtosis value ranges from 1.97 to 8.82, with an average value of 3.97. Through study and analysis on the distribution characteristics of particle size parameters and sedimentary environments, it is found that the distribution of particle size components in the study area is in good agreement with the distribution characteristics of sediment types. It shows a trend of sediment particle size gradually becoming finer as it moves further offshore. Meanwhile, the distribution characteristics of surface sediments on the seabed in the study area are mainly influenced by the source material and hydrodynamic conditions.