摘要
近岸海域潮流的流速流向对水体物质输送和海岸工程具有重要影响,是海域环境的重要参数之一。本文根据2011年10月在朱家尖岛东部近岸约30km海域的大、小潮实测资料,分析了该区域流速流向的时空变化特征,并对其影响因素进行了初步探讨。结果显示:该海域为不正规半日潮型,实测潮差最小0.75m,最大4.32m,平均2.64m;平均涨落潮历时分别为5小时54分和6小时37分;潮流以旋转流为主,涨落潮主潮流分别呈NNW和SSE向;流速变化显著,最小流速0.01m/s,最大流速(外侧点大潮表层)2.32m/s;大小潮各测点平均的表层余流方向196、流速0.65m/s,底层余流方向328、流速0.07m/s,垂线平均余流方向202、流速0.22m/s,反映了观测期间余流流向受偏北风影响,其变化体现水体内部摩擦和径、潮流异向输运。
Tidal currents operating off the east coast of Zhujianhian Island were measured during spring and neap tides from October 20 to October 28, 2011. These data were analyzed to identify spatial and temporal variations in flow velocity. The results showed that the area is subject to irregular semidiurnal tides. The tidal range varied from 0.75 to 4.32 m, with an average range of 2.64 m. The average duration of the rising tide phase was 5 hours and 54 minutes, compared with 6 hours and 37 minutes for the falling tide phase. As expected, the ebb current was directed SSE and was stronger than the NNW- directed flood current. Current velocity varied significantly in the vertical profile at a single location, within a single tidal cycle, and between neap and spring tides. The minimum velocity recorded was 0.01 m/s, and the maximum velocity was 2.32 m/ s, measured at the surface during a spring tide. The mean residual current at the surface was 0.65 m/s with a direction of 196°. In contrast, the mean residual current at the seabed was 0.07 m/s in the direction of 328°. Over the full vertical profile, the residual current had a velocity of 0.22 m/s and a direction of 202°, reflecting the impact of northerly winds during the observation period.
出处
《上海国土资源》
2013年第1期27-31,59,共6页
Shanghai Land & Resources
基金
国家自然科学基金创新群体项目(41021064)
国家973计划项目(2010C B951202)
上海市科委项目(10dz1210505)
国家重点实验室科研业务课题(SKLEC-2009KYYW02)资助)
关键词
朱家尖岛
潮流
余流
盛行风向
海岸工程
Zhujiajian island
tidal currents
residual currents
wind direction
coastal engineering
作者简介
何海丰（1987-），男，硕士生，主要从事近岸沉积动力过程研究．电子邮箱：hhfsxs@163．com联系电话：021-62233115
通讯作者：杨世伦（教授／博导）：slyang@sklec．ecnu．cn
