岬湾海滩沉积物粒度粒形分布及其输运趋势的指示  

Grain Size and Shape Analysis as Indications of Sediment Transport in a Headland Bay Beach

作　　者：程武风 陈沈良[1] 钟小菁 郭俊丽 李鹏[1] 胡进[1] CHENG WuFeng;CHEN ShenLiang;ZHONG XiaoJing;GUO JunLi;LI Peng;HU Jin(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China;College of Harbor and Coastal Engineering,Jimei University,Xiamen,Fujian 361021,China)

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200241 [2]集美大学港口与海岸工程学院,福建厦门361021

出　　处：《沉积学报》2024年第5期1541-1552,共12页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(41906184);海洋公益性行业科研专项经费项目(201405037)。

摘　　要：【目的与方法】粒度和粒形作为沉积物的基本属性,蕴含着输运历史、运动方式和沉积环境等丰富的信息。通过利用动态图像法对海南岛保定湾岬湾海滩52个剖面253组表层沉积物样品的粒度粒形测试,分析探讨了粒度粒形沿岸和横向的空间分布特征,结合粒度趋势分析结果建立了粒形趋势分析模型。【结果】研究表明,保定湾开敞段、过渡段和遮蔽段相同岸段内的球形度在沿岸方向差异不大,横向方向有从陆向海逐渐减小的趋势。不同岸段间沉积物在粒度小于2.5Φ时的球形度,在沿岸方向从开敞段至遮蔽段有逐渐减小的趋势。球形度的增大方向可指示沉积物输运趋势,建立的粒形趋势分析模型具有较高的准确性和优势,可计算任意粒度区间的输运趋势,可与粒度分析方法相结合以达到不同的研究目的。【结论】研究成果可为岬湾海滩的演变机制和稳定性研究提供理论支持。[Objective and Methods]The basic properties of sediment particles(grain size and shape)provide information about their transport history,mode,and sedimentary environment.The grain size and shape of 253 sediments from 52 beach profiles in Baoding Bay were analyzed using the dynamic image method.The cross-shore and longshore distribution characteristics of the grain size and grain shape are analyzed and discussed.A trend analysis model was established for grain size and shape.[Results]The grain shape in exposed,intermediate and sheltered parts of the Baoding Bay beach show little difference longshore,but there is a trend of gradually decreasing size from land to sea cross-shore.When the size of the grains in different parts of the beach is less than 2.5Φ,their shape gradually shows a downward trend longshore from the exposed section to the sheltered section.The grain-shape increase direction indicates the transport trend of the sediment.The grain-shape trend analysis model is highly accurate and useful for calculating the transport trend of any grain size range,and works well in combination with other grain-size analysis methods for different research purposes.[Conclusions]The results of the study provide theoretical support for beach evolution mechanism analysis and beach stability research.

关 键 词：岬湾海滩 沉积物粒度粒形 输运趋势 

分 类 号：P736.21[天文地球—海洋地质]