维普中文期刊产品整合服务

Intratidal and neap-spring variations of suspended sediment concentrations and sediment transport processes in the North Branch of the Changjiang Estuary

查看全文 作　　者：LI [1]Zhanhai;LI Michael [2]Z;DAI [1]Zhijun;ZHAO [1]Fangfang;LI [1]Jiufa 高影响力作者 机构地区：[1]State Key Laboratory of Estuarine and Coastal Research,East China Normal University;[2]Geological Survey of Canada (Atlantic),Bedford Institute of Oceanography,Dartmouth,B2Y 4A2,Canada高影响力机构 出　　处：《Acta Oceanologica Sinica》索引2015年第34卷第1期,共11页高影响力期刊 基　　金：The National Science Foundation of China under contract Nos 50939003 and 41176069;the Foundation of State Key Laboratory of Estuarine and Coastal Research,East China Normal University of China under contract No.SKLEC-2012KYYW06 摘　　要：Profiles of tidal current and suspended sediment concentration(SSC) were measured in the North Branch of the Changjiang Estuary from neap tide to spring tide in April 2010. The measurement data were analyzed to determine the characteristics of intratidal and neap-spring variations of SSC and suspended sediment transport. Modulated by tidal range and current speed, the tidal mean SSC increased from 0.5 kg/m3 in neap tide to 3.5 kg/m3 in spring tide. The intratidal variation of the depth-mean SSC can be summarized into three types: V-shape variation in neap tide, M-shape and mixed M-V shape variation in medium and spring tides. The occurrence of these variation types is controlled by the relative intensity and interaction of resuspension, settling and impact of water exchange from the rise and fall of tide. In neap tide the V-shape variation is mainly due to the dominant effect of the water exchange from the rise and fall of tide. During medium and spring tides, resuspension and settling processes become dominant. The interactions of these processes, together with the sustained high ebb current and shorter duration of low-tide slack, are responsible for the M-shape and M-V shape SSC variation. Weakly consolidated mud and high current speed cause significant resuspension and remarkable flood and ebb SSC peaks. Settling occurs at the slack water periods to cause SSC troughs and formation of a thin fluff layer on the bed. Fluxes of water and suspended sediment averaged over the neap-spring cycle are all seawards, but the magnitude and direction of tidal net sediment flux is highly variable. 关 键 词：悬浮泥沙浓度 长江口北支 弹簧 输运过程 形状变化 深度平均 电流速度 SSC
相关文献

参考文献(41)

引证文献(10)

耦合文献(45)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费