| 长江口水下三角洲沉积物粒度组成及其在减沙背景下的响应 |
| |
| 引用本文： | 战庆,王张华,陈勇,赵宝成.长江口水下三角洲沉积物粒度组成及其在减沙背景下的响应[J].地质通报,2016,35(10):1715-1723. |
| |
| 作者姓名： | 战庆 王张华 陈勇 赵宝成 |
| |
| 作者单位： | 1. 上海市地质调查研究院, 上海 200072;2. 华东师范大学河口海岸国家重点实验室, 上海 200062 |
| |
| 基金项目： | 中国地质调查局项目（编号：GZH201200506）、国土资源部项目（编号：201211009） |
| |
| 摘 要： | 近年来长江口水下三角洲对入海泥沙减少的响应问题越来越受到关注。通过分析长江水下三角洲百年沉积速率的分布特征及位于水下三角洲泥质沉积区不同位置4个浅孔的粒度、~(210)Pb和~(137)Cs数据,探讨其对流域入海水沙变化及水动力变化的响应。研究结果显示,1954年后长江口北支萎缩是导致CDZS10孔所在区域沉积物粒度较其他3孔明显粗的主要原因。而CDZS10孔沉积物上粗下细则是由20世纪80年代三峡蓄水后长江入海泥沙显著下降、海洋动力明显增强引起的。另外,北支萎缩及三峡水库调蓄作用导致泥质区南移,并向杭州湾和嵊泗列岛延伸发展。
|
| 关 键 词： | 粒度 减砂 北支 响应 海洋动力 |
| 收稿时间： | 2016/5/19 0:00:00 |
| 修稿时间： | 2016/9/10 0:00:00 |
Grain size of recent sediments in Yangtze River subaqueous delta and its response to sediments supply decline |
| |
| ZHAN Qing,WANG Zhanghu,CHEN Yong and ZHAO Baocheng.Grain size of recent sediments in Yangtze River subaqueous delta and its response to sediments supply decline[J].Geologcal Bulletin OF China,2016,35(10):1715-1723. |
| |
| Authors: | ZHAN Qing WANG Zhanghu CHEN Yong and ZHAO Baocheng |
| |
| Institution: | 1. Shanghai Institute of Geological Survey, Shanghai 200072, China;2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China |
| |
| Abstract: | The response of Yangtze River subaquatic delta to river sediment decline has attracted more and more attention in recent years. In this paper, grain sizes and radiometric 210Pb and 137Cs of the cores in different areas of the subaquatic delta were analyzed to explore the response to river sediment decline and change of hydrodynamic force. The results show that grain sizes of core CDZS10 sediments are much coarser than those of the other three cores which might be closely related to the block of north branch of Yangtze River in the estuary after 1954. In terms of sediment composition the authors found grain size coarsening up from 1.2m (1979) in Core CDZS10 which might be an obvious response to significant sediments supply decline of the Yangtze River after the 1980''s. In addition, the block of north branch and impoundment hasled to the mud region moving southward and extending to Hangzhou Bay and Shengsi Islands. |
| |
| Keywords: | grain size sediment decline north branch response marine dynamics |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
