| HE Zhiguo,HUANGFU Kailong,YUAN Yeping,SONG Dan,LI Li. 2016. Variations of temperature, salinity and current in the southern tidal passage of the Hangzhou Bay, China. Acta Oceanologica Sinica, 35(3):30－37 |
| Variations of temperature, salinity and current in the southern tidal passage of the Hangzhou Bay, China |
| 杭州湾南部主水道内温度、盐度、潮流的变化特征 |
| Received:October 31, 2014 Revised:June 29, 2015 |
| DOI：10.1007/s13131-016-0819-8 |
| Key words:macro-tidal estuary mooring observations temperature and salinity variations tidal current curved channel |
| 中文关键词: 强潮河口 锚定观测 温盐变化 潮流 弯曲航道 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | HE Zhiguo | Ocean College, Zhejiang University, Hangzhou 310058, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | HUANGFU Kailong | Ocean College, Zhejiang University, Hangzhou 310058, China | | | YUAN Yeping | Ocean College, Zhejiang University, Hangzhou 310058, China | | | SONG Dan | Ocean College, Zhejiang University, Hangzhou 310058, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | dsong@zju.edu.cn | | LI Li | Ocean College, Zhejiang University, Hangzhou 310058, China | |
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| Abstract: |
| Field surveys covering a spring-neap tidal period were conducted to investigate the characteristics of tidal dynamics within a curved channel in the southern Hangzhou Bay, China. The channel has a maximum depth of more than 100 m with an average tidal range of 2.5 m, serving as the main tidal passage in the southern part of the Hangzhou Bay. Water salinity, temperature and velocity data were collected from the ship-based transects and mooring measurements. During flood tide, the tidal current intrudes into the Hangzhou Bay through the northern side of the channel with a maximum velocity of about 2 m/s, while retreats through the southern side during ebb tide with a maximum velocity of 1.8 m/s. Due to the pressure, density gradients, the Coriolis force and centrifugal effect, a lateral exchange flow is generated as the tidal current relaxes from flood to ebb. Salinity and temperature data show that the water in the channel is weakly stratified during both spring and neap tides in summer time. However, mixing in the middle region will be enhanced by the lateral circulation. Mooring data indicate that the temperature and salinity are varying at a frequency similar to tidal current but higher than sea level oscillation. Our results support the hypothesis that the high frequency salinity and temperature variations could be generated by combination of the tidal current and the lateral exchanging flow. |
| 中文摘要: |
| 本文基于船载及锚定ADCP、CTD观测,获得了大、小潮时的温度、盐度、浊度、潮位、流速等观测数据,研究杭州湾南部的一个主要弯曲航道——螺头水道内的潮流动力学特性。螺头水道水深超过100 m、最大潮差大于2.5 m。涨潮时,强潮流速出现在水道北岸,落潮时,强潮流速出现在水道南岸,最大流速值分别为约2 m/s和1.8 m/s。受压强梯度、密度梯度、科氏力和离心力影响,涨落潮过渡时在水道的横断面产生较为明显的环流。夏季存在较弱的层化现象,深水处受环流的影响,盐度、温度的混合较强。锚定观测数据表明,温度、盐度的变化频率与潮流的变化频率相似,但存在高于M2分潮频率的谱峰值。因此,笔者认为潮流与横向环流的相互作用,可能导致更高频率的盐度和温度变化。 |
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