洋山深水港海域悬沙浓度时空变化及其动力原因  

Dynamics reasons and temporal-spatial variations of suspended sediment condition in the sea area of Yangshan deep-water harbor

作　　者：左书华[1,2] 张宁川[2] 李蓓[1] 杨华[1] 

机构地区：[1]交通部天津水运工程科学研究所工程泥沙交通行业重点实验室,天津300456 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《华东师范大学学报（自然科学版）》2009年第3期72-82,共11页Journal of East China Normal University(Natural Science)

基　　金：交通部西部科技建设项目“岛群中建港水动力关键技术问题研究”(200632800003-04);2008年河口海岸科学全国博士生学术论坛资助

摘　　要：洋山港海域是多岛屿、多汊道,由大、小洋山两条岛链围成的喇叭口型的海域,是以落潮流为主、含沙量高、潮流强的潮汐水道,泥沙运动主要以悬沙为主.通道内潮流基本为WNW-ESE向往复流,潮流平均流速在1.0m/s,最大流速都在2.0m/s以上,含沙量在1.0kg/m3以上.根据该海域不同时期实测含沙量资料,分析了洋山港海域悬沙浓度的时空分布格局,并讨论了其分布变化的原因,包括长江口和杭州湾泥沙扩散对洋山港海域泥沙环境的影响、潮差的影响以及"峡道效应"对洋山港高含沙量的形成.The Yangshan deep-water harbor locates in the Qiqu Archipelago with many islands and tidal channels. The cyclic tidal flow with strong velocity of 1.0m/s is the major dynamic force for maintaining the stability of the way and the sediment in flow is always under the combining action of waves and tidal currents. The seabed evolution is aroused by suspended sediment transport. The suspended sediment concentration is more 1.0 kg/m^3. Based on the measured da- ta of Oct. 1996, 1999, 2004 and 2006, and the measured surface suspended sediment concentra- tion data from 1998 to 2007, the change characteristic of suspended sediment concentration was analyzed. Moreover, it was discussed to the causes of the variation of suspended sediment con- centration, the effect of suspended sediment diffusion of Changjiang river mouth to Yangshan, and the “channel effect” to high suspended sediment concentration in Yangshan sea areas.

关 键 词：洋山深水港 水动力 悬沙浓度 峡道效应 

分 类 号：P333.4[天文地球—水文科学]