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辽东湾西岸典型岬湾海滩表层沉积物粒度分布特征及水动力条件浅析
引用本文:刘世昊,丰爱平,夏东兴,杜军,胡维芬,李平,张志卫.辽东湾西岸典型岬湾海滩表层沉积物粒度分布特征及水动力条件浅析[J].沉积学报,2014,32(4):700-709.
作者姓名:刘世昊  丰爱平  夏东兴  杜军  胡维芬  李平  张志卫
作者单位:国家海洋局第一海洋研究所;中国科学院南海海洋研究所;中国海洋大学环境科学与工程学院;
基金项目:海洋公益性行业科研专项“辽宁省、山东省砂质海岸质量调查及养护技术研究”(编号:200905008);国家海洋局第一海洋研究所基本科研业务项目(编号:2012G19,2013G13)联合资助
摘    要:海滩形态、沉积物组分和粒度参数能反映海滩沉积环境。自2010年7月到2011年12月在辽东湾西岸葫芦岛市龙湾滨海沙滩和兴城第一海水浴场沙滩进行冬夏重复海滩剖面测量和表层沉积物粒度分析,结果表明:①两海滩以85黄海高程-0.6 m和-4.7 m为界划分为海滩、水下岸坡和陆架平原三个地貌单元。②龙湾沙滩海滩形态较稳定,兴城一浴海滩和水下岸坡淤积,均与海滩养护相关。③根据沉积物组分和粒径参数的差异,两海滩可横向划分为I、II、III、IV四个沉积区。各沉积区内中值粒径并没有出现横向递减的趋势,分选系数、偏态和峰态变化复杂。各沉积区间水力条件截然不同。④与兴城一浴相比,龙湾沙滩I沉积区沉积物颗粒较细、分选较好,水下岸坡存在综合动力条件弱的沉积区段,陆架平原缺少潮流作用强烈的区段。

关 键 词:岬湾沙滩    粒度参数    海岸动力地貌    水动力条件    辽东湾

Grain-Size Distribution of Surface Sediments of Two Typical Headland Bay Beaches on Western Liaodong Bay,Bohai Sea and Simply Analysis of Hydrodynamic Conditions
Abstract:Morphology, sediment components and grain-size parameters revealed the depositional environment of coastal zone, especially the beach unit. Measurements had carried out in Longwan Beach and the First Beach of Xingcheng City, Huludao City, Liaoning Province from July 2010 to December 2011. That is to say, four researches had been taken in every summer and winter, which included the observations and analysis of both beach elevations and sedimentary grain size characteristics. It was shown that ①by using 1985 Yellow Sea Elevation -0.6m and -4.7 m as boundaries, the two beaches in the study area might be, respectively, divided into three geomorphic units named beach unit, underwater slope unit and continental shelf unit. ②The sedimentary settings of Longwan Beach were stable, while the beach unit and underwater slope unit in the First Beach of Xingcheng City were alluvial, which might be caused by the engineering of beach nourishment. ③The two beaches might be divided into four sedimentary zones through the transverse variations of sediment components and grain size parameters. The changing trends of median diameter didn’t show transverse decreasing trend, while the variation rules of other gain size parameters were complicated in different sedimentary areas, indicating that the hydrodynamic conditions of each sedimentary zone were different. ④Compared to the First Beach of Xingcheng City, the sediments sampled in the sedimentary area I on Longwan Beach were thicker and worse sorted. the underwater slope unit of Longwan Beach was formed in a weak dynamic condition while the continental shelf unit of the First Beach of Xingcheng City was dominated by strong tidal currents.
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