首页|万宁日月湾近岸海域悬浮泥沙输运特征及沉积动力环境分析

万宁日月湾近岸海域悬浮泥沙输运特征及沉积动力环境分析

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依据实测悬浮泥沙和同步观测的海流数据,利用悬沙通量机制分解法计算各站潮平均单宽输沙量,分析研究区海域的悬沙输运机制及主要的力学控制因素.依据表层沉积物的粒度数据,分析了研究区表层沉积物的分布特征,并利用Flemming三角图示法对研究区进行沉积动力环境分区.结果表明,研究区悬浮泥沙输移主要受拉格朗日平流输运控制,垂向净环流影响次之;潮平均单宽净输沙量输运方向为SW向,与研究区余流方向基本一致;外侧站位潮平均单宽输沙量呈现自东北向西南方向递减趋势,而内侧站位却相反,潮平均单宽输沙量呈现自东北向西南方向递增趋势,表明近岸有沙源供给,近岸侵蚀或河流输沙;研究区整体被砂覆盖,局部区域为粉砂质砂、砾质砂、砂质砾,存在少量贝壳或珊瑚礁;水动力环境可划分为S区、A区和B区,表层沉积物由推移、跃移、悬移三类运动方式的物质组成,其中以跃移物质为主,随着水动力环境变弱,表层沉积物的跃移组分含量降低,悬移组分含量升高.
Characteristics of suspended sediment transport and analysis of sedimentary dynamic environment in the coastal waters of Wanning Riyue bay
Based on the synchronized data of suspended sediment and sea current,this paper analyzed the suspended sediment transport mechanism and the main mechanical control factors in study areas u-sing sediment flux mechanism decomposition method.The sedimentary dynamic environment was di-vided into different zones using Flemming triangle diagram method on the basis of the distribution char-acteristics of the surface sediments in the study area.The results showed that the Lagrangian advection transport was the main governing factor in transport of suspended sediment and the vertical net circula-tion came second.And the transport direction of the tidal average single-width net sediment transport was in SW,which corresponds to the direction of the remaining flow in the study area.The average single tidal-width sediment transport at the outer station showed a decreasing trend from northeast to southwest,while the inner station showed the opposite,the average single tidal-width sediment trans-port increased from the northeast to the southwest.It was indicated that there was nearshore erosion or river sand transport.Observation showed that the study area was covered largely by sand and the local area was silty sand,gravel sand,and sandy gravel,with a small number of shells or coral reefs.The dynamic environment could be divided into zone S,zone A and zone B.The motion of surface sediments were three types:moving,jumping,and overhanging.The jumping was the main route of the surface sediment.The surface sediments had a lower content of transitional components in sediments and the increase of suspended-transition components with the hydrodynamic environment became weaker.

suspended sedimentsedimentary dynamic environmenttransport mechanismresidual current

林纪江、王平、张卓、唐灵、王蕾、游大伟、聂宇华、牛建伟

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国家海洋局南海信息中心,广东广州510310&南方海洋科学与工程广东省实验室(珠海),广东珠海 519000

自然资源部海洋环境探测技术与应用重点实验室,广东广州 510310

福建省港航管理局勘测中心,福建福州 350009

中国科学院南海海洋研究所,广东广州 510301

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悬浮泥沙 沉积动力环境 输运机制 余流

南方海洋科学与工程广东省实验室(珠海)资助项目国家海洋局南海分局局长基金项目广东省促进经济高质量发展专项资金海洋经济发展项目2020年国家重点研发计划重点专项

SML2021SP102180202GDOE[2019]A552019YFC1408400

2024

10.13984/j.cnki.cn37-1141.2024.03.009

海洋湖沼通报
山东海洋湖沼学会

海洋湖沼通报

CSTPCD北大核心
影响因子：0.464
ISSN：1003-6482
年,卷(期)：2024.46(3)
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