海南昌化江入海口底表沉积物粒度特征及输运趋势  

Grain Size Characteristics and Its Response to Sediment Transport Trend in Changhua River Estuary,Hainan Island

作　　者：王雪木[1,2] 瞿洪宝 熊元凯 吕琳 胡克 WANG Xuemu;QU Hongbao;XIONG Yuankai;Lü Lin;HU Ke(Marine Geological Survey Institute of Hainan Province,Haikou,Hainan 570206,China;Hainan Key Laboratory of Marine Geological Resources and Environment,Haikou,Hainan 570206,China;School of Ocean Sciences,China University of Geosciences,Beijing 100083,China)

机构地区：[1]海南省海洋地质调查研究院,海南海口570206 [2]海南省海洋地质资源与环境重点实验室,海南海口570206 [3]中国地质大学(北京)海洋学院,北京100083

出　　处：《现代地质》2022年第1期88-95,共8页Geoscience

基　　金：2019年海南省基础与应用基础研究计划(自然科学领域)高层次人才项目(2019RC349,2019RC350);海南省科技计划三亚崖州湾科技城联合项目(420LH029);海南省国土资源厅项目“海南岛北部海砂资源调查评价”(HZ2015-235);海南省地质局项目“西南浅滩海砂开采试点海砂出让前期工作”(T102972.510)。

摘　　要：对海南岛昌化江入海口110个底表沉积物样品进行了粒度分析,并利用二维沉积物粒径趋势分析模型对沉积物粒度参数开展趋势分析。研究结果表明,按照Folk沉积物分类三角图解法,昌化江入海口外底表沉积物可划分为含砾砂、砂、砾质泥质砂、砂质砾、粉砂、泥、砂质泥、砾质砂、砂质粉砂和粉砂质砂共10种沉积物类型,其中砂和砾组分的分布范围具有一致性,粒度组成以砂、粉砂、泥为主。通过粒度组分和参数分析,研究区可分为两大类沉积环境区,即南部的近岸区域和北部的离岸区域。粒径趋势分析显示,沉积物的输运趋势与水动力条件吻合,并识别出了研究区内南部和北部两处汇聚沉积中心,判明了四更沙角条带状沉积的物质来源。Grain size analysis and parameter calculations have been carried out for 110 surface sediment samples from the Changhua River Estuary,Hainan Island.Based on the Folk sediment classification ternary plot,the surface sediment samples can be divided into 10 sediment types:gravelly sand,sand,gravelly argillaceous sand,sandy gravel,silt-sand,mud,sandy mud,gravelly sand,sandy silt,and silty sand.Distribution range of sediment sand and gravel components is similar,and the particle size composition comprises mainly sand,silt-sand,and mud.Factor and cluster analysis of grain size parameters is used to discriminate different depositional environments.The study area can be further divided into the southern nearshore and northern offshore subareas.Grain size trend analysis suggests that the sediment transport pattern is consistent with the local hydrodynamic conditions.There are two aggregate sedimentation centers in the southern and northern parts of the study area.The material source of the banded sediments at Sigengsha Cape has also been identified.

关 键 词：粒度特征 粒径趋势 底表沉积物 昌化江入海口 

分 类 号：P736.2[天文地球—海洋地质]