【摘 要】
：
对汕头近岸海域70个站位表层沉积物作了粒度分析和粒度参数计算,以探讨沉积物粒度分布特征.分析结果显示,研究区表层沉积物可划分为9种底质类型,以黏土质粉砂(YT)、砂质粉砂(ST)和砂-粉砂-黏土(S-T-Y)为主;砾、砂、粉砂和黏土的平均含量分别为1.4％,29.2％,51.0％,18.4％.平均粒径在0.12～7.30Ф之间变化,平均值为5.53Ф;分选系数、偏态和峰态值的变化范围分别为0.50
【机 构】
：
中国科学院南海海洋研究所 边缘海地质重点实验室,广东 广州 510301;国家海洋局海岛研究中心,福建 平潭 350400;中国科学院大学,北京 100049
【出 处】
：
福建省海洋学会2014年学术年会暨福建省科协第十四届学术年会分会场
论文部分内容阅读
对汕头近岸海域70个站位表层沉积物作了粒度分析和粒度参数计算,以探讨沉积物粒度分布特征.分析结果显示,研究区表层沉积物可划分为9种底质类型,以黏土质粉砂(YT)、砂质粉砂(ST)和砂-粉砂-黏土(S-T-Y)为主;砾、砂、粉砂和黏土的平均含量分别为1.4％,29.2％,51.0％,18.4％.平均粒径在0.12～7.30Ф之间变化,平均值为5.53Ф;分选系数、偏态和峰态值的变化范围分别为0.50～2.94,-0.65～0.30和0.63～2.67,对应的平均值为1.82,-0.02和1.11.根据粒度分析结果,结合系统聚类方法和因子分析方法将研究区分为四类沉积区,分别代表不同的沉积环境,并应用GSTA模型分析了沉积物净输运趋势.结果显示,在汕头港水深＜10m的海区,径流来沙和海域来沙有在榕江入海口和近岸汇聚的趋势;水深＞10m的海区,沉积物呈现出明显的沿海岸线东北向输运的特征;在柘林湾,沉积物主要表现为弱的由海岸/海岛向海湾输运的特征.粒径趋势模型所揭示的这种沉积物输运格局与研究区的物源和水动力状况较好吻合,可为研究区港口建设和航道管理的决策提供参考资料.
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