海南博鳌海域的沉积物输运趋势与沉积速率  

Sediment transport and deposition rate along the Boao coast, Hainan Island

作　　者：张亮[1] 贾建军[2] 高建华[1] 龚文平[3] 汪亚平[1] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,地理与海洋科学学院,江苏南京210093 [2]国家海洋局海底科学重点实验室,国家海洋局第二海洋研究所,浙江杭州310012 [3]中山大学海洋学院,广东广州510275

出　　处：《热带海洋学报》2011年第2期123-130,共8页Journal of Tropical Oceanography

基　　金：国家自然科学基金项目(40776049);国家“908”项目(HN908-02-05、908-02-01-08)

摘　　要：2001年与2009年分别在博鳌海域进行表层沉积物和柱状沉积物取样,通过粒度分析和计算获取沉积物粒度参数,借助放射性同位素测年估算沉积速率。结果表明,与2001年相比,目前万泉河口、沙美内海有细化趋势(由粗砂变为细砂),玉带滩北部沉积物变粗,而玉带滩南部变化不大。此外,目前沙美内海北部沉积物输运趋势和2001年正好相反,南部则基本一致。万泉河口北侧沙嘴由淤积变为侵蚀,与实地调查一致。玉带滩北部沉积物沿岸向南、向外海输运,原处于侵蚀状态的南部岸段现已处于稳定阶段,这与2001年和2009年两个时段的岸线对比结果吻合。210Pb测年结果发现,潟湖内的沉积速率约为2mm.a?1,和2001年的测年结果基本一致。Surface and core sediment samples were collected at the Boao Estuary in 2001 and 2009.On the basis of grain size analysis and 210Pb dating,grain size parameters and sediment transport pathway were acquired;sedimentation rates were es-timated by a radioisotope method.The results show that the sediments in the estuary of the Wanquan River,Shameineihai Lagoon,and the northern Yudai sand barrier indicate a trend of becoming finer（from coarse sand to finer sand） from 2001 to 2009,while in the southern Yudai sand barrier keeps the sand condition almost unchanged.In addition,the sediment transport trend of the northern Shameineihai Lagoon was reversed to what was in 2001,while in the southern part the condition was almost unchanged.The northern bank of the Wanquan River changed from siltation into erosion,which was identified by the fieldwork survey in 2009.The sediment in the northern Yudai sand barrier currently transported southward along the shore,and then moved offshore to the open sea.The southern beaches are becoming stable from previous erosion,which is consistent to the coastline comparison of 2001 and 2009.The deposition rate at the Shameineihai Lagoon was 2 mm/yr on average,which was similar to the results in 2001.

关 键 词：沉积物粒度参数 粒径趋势分析 沉积速率 博鳌 

分 类 号：P737[天文地球—海洋地质]