福建平海湾外湾表层沉积物粒度特征及冲淤变化

发布时间：2018-03-09 09:01

本文选题：海洋地质学　切入点：平海湾外湾　出处：《应用海洋学学报》2017年02期 　论文类型：期刊论文

【摘要】：通过对平海湾外湾106个表层沉积物样品的粒度分析,阐述了平海湾外湾表层沉积物的物质组成和粒度参数分布特征.利用沉积物粒径趋势模型初步探讨了平海湾外湾的沉积物输运趋势,结合新老海图对比,分析了该海域的冲淤变化特征,并结合平海湾发展规划选取代表站位来分析计算潮流和波浪对海底沉积物的冲刷.结果表明,研究海域表层沉积物可分为5种类型,主要为粘土质粉砂,随着水深的增加,沉积物呈逐渐变细的趋势.沉积物的平均粒径(Mz)、分选系数(σi)、偏态(S_(ki))及峰态(K_g)的分布与研究区海域沉积环境和水动力条件等相对应.粒径趋势分析显示研究区表层沉积物的输运趋势主要为NW向和SE向.对比不同年代海图及观测资料表明,研究海域呈弱淤积状态;经过分析计算,研究区海底沉积物不是受到潮流而是波浪的冲刷.
[Abstract]:Based on the particle size analysis of 106 surface sediment samples from the outer bay of Pinghai Bay, The characteristics of material composition and particle size parameter distribution of surface sediments in the outer bay of Pinghai Bay are described. The sediment transport trend in the outer bay of Pinghai Bay is preliminarily discussed by using the sediment particle size trend model, and combined with the comparison of new and old charts. The characteristics of scour and siltation in the sea area are analyzed, and the representative stations are selected in the development plan of Pinghai Bay to analyze and calculate the erosion of sea bottom sediments by tidal currents and waves. The results show that the surface sediments in the study area can be divided into five types. Mainly clay silty sand, with the increase of water depth, The distribution of the average grain size of sediment (蟽 _ I _ (I)), the sorting coefficient (蟽 _ I _ (I)) and the peak _ state _ K _ g correspond to the sedimentary environment and hydrodynamic conditions in the study area. The analysis of particle size trend shows that the surface layer of the study area is characterized by the distribution of grain size trend. The transport trends of sediments are mainly NW and SE. The sediment in the study area is not subject to tidal current but washed by waves.
【作者单位】：国家海洋局第三海洋研究所;
【基金】：国家自然科学基金资助项目(1401129) 海洋公益性行业科研专项经费资助项目(201405025)
【分类号】：P736.21

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