海州湾潮滩岩芯沉积物粒度特征及其环境意义

发布时间：2018-06-21 13:15

本文选题：沉积物 + 粒度　；参考：《海洋湖沼通报》2016年01期

【摘要】：通过对海州湾的野外考察、4根潮滩沉积物钻孔岩芯(HZ01、HZ02、HZ03和HZ04)的获取和室内岩芯沉积物粒度分析,探讨海州湾潮滩岩芯沉积物粒度变化特征,并指示其环境意义。结果表明:海州湾潮间带上、中部岩芯沉积物以粉砂为主,粉砂含量高于80%,而潮间带下部岩芯沉积物以粉砂和砂质粉砂为主,粉砂含量均值在65%左右,砂含量均值在10%左右。垂向变化上,潮间带上部岩芯HZ01沉积物粒径表现为从下往上,呈现由细变粗的趋势,潮间带下部岩芯HZ03和HZ04由下往上整体上表现为由粗变细的过程。空间分布上表现为由潮间带下部-潮间带中上部-潮间带上部呈现为由粗-细的空间变化特征。岩芯HZ01沉积物从下往上由细变粗的变化规律可能与1950's临洪河北侧大规模的围垦改变潮滩动力过程有关。潮间带下部岩芯HZ03和HZ04由下往上由粗变细的变化规律可能与临洪河输运泥沙在河口附近不断淤积并向海推进导致潮滩海拔高程逐渐增加、水动力逐渐减弱有关。潮滩沉积物在潮滩面上的空间分布规律反映了潮流是主要的动力条件,表现由海向陆的逐渐减弱过程。同时,粒度的空间分布也指示了外海、岚山头运移物质、废黄河沉积物和临洪河泥沙是重要的泥沙来源。
[Abstract]:Based on the field investigation of HZ01HZ02HZ03 and HZ04 in Haizhou Bay, the characteristics of grain size variation of core sediments in Haizhou Bay are discussed, and their environmental significance is indicated. The results show that the core sediments in the middle of Haizhou Bay are mainly silt, and the silt content is higher than 80%, while the core sediment in the lower intertidal zone is silt and sandy silt, the average silt content is about 65% and the average sand content is about 10%. Vertically, the grain size of core HZ01 in the upper intertidal zone shows a trend from fine to coarse from bottom to top, and the core HZ03 and HZ04 in the lower intertidal zone show a process from coarse to thin on the whole from bottom to top. The spatial distribution is characterized by coarse-fine spatial variation from the lower intertidal zone to the middle and upper intertidal zone. The change of core HZ01 sediment from fine to coarse from bottom to top may be related to the large scale reclamation and changing tidal flat dynamic process in the north side of the 1950s Linhong River. The variation of core HZ03 and HZ04 from bottom to top in the intertidal zone may be related to the deposition of sediment transported by the Linhong River near the estuary and its advance to the sea, which leads to the gradual increase of the elevation of the tidal flat and the weakening of the hydrodynamic force. The spatial distribution of tidal flat sediments on the tidal flat surface reflects that tidal current is the main dynamic condition, which shows the gradual weakening process from sea to land. At the same time, the spatial distribution of grain size also indicates that the transport of material in the outer sea and the Lanshan Mountains, the sediment of the abandoned Yellow River and the sediment of the Linhong River are important sources of sediment.
【作者单位】：南京信息工程大学海洋科学学院;淮海工学院测绘工程学院;连云港市海洋与渔业局;
【基金】：国家自然科学基金项目(41271228) 江苏省大学生创新创业训练计划项目江苏高校优势学科建设工程项目资助
【分类号】：P736.21

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