| 椒江河口层化动力特性研究 |
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| 引用本文： | 姚炎明,郑逸群,赵新宇,袁金雄,李莉.椒江河口层化动力特性研究[J].海洋学报,2021,43(10):23-37. |
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| 作者姓名： | 姚炎明 郑逸群 赵新宇 袁金雄 李莉 |
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| 作者单位： | 1.浙江大学 海洋学院，浙江 舟山 316021 |
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| 基金项目： | 国家重点研发计划项目（2020YFD0900803）；国家自然科学基金（41976157）；中央高校基本科研业务费；浙江省基金（2020C03012） |
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| 摘 要： | 基于椒江河口大、小潮期间水位、流速、盐度和悬沙浓度观测数据，研究了椒江河口主潮汐通道的水动力、盐度和悬沙浓度的时空变化特征，解释了高浊度强潮作用下的层化物理机制。椒江河口大潮期悬沙浓度和盐度均大于小潮期，主潮汐通道区域落潮期悬沙浓度大于涨潮期；盐度随潮变化，盐水锋面出现在S2测站，锋面附近出现最大浑浊带；自陆向海，悬沙浓度递减，盐度递增；随水深增加，悬沙浓度与盐度递增。Richardson数与混合参数显示，盐度和悬沙引起的层化现象，是随着潮汐的变化而变化，涨潮时的层化均强于落潮，小潮时的层化持续时间最长，区域更广。混合参数随潮周期变化，大潮期高于临界值1.0，小潮期低于临界值1.0。小潮期水体层化强于大潮期；潮汐应变项是影响势能差异变化率的重要因素；落潮期间层化向混合状态转化，涨潮相反。
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| 关 键 词： | 悬沙浓度 盐度 层化 混合 椒江河口 |
| 收稿时间： | 2020-07-06 |
Characteristics of stratification in the Jiaojiang Estuary |
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| Institution: | 1.Ocean College, Zhejiang University, Zhoushan 316021, China2.Taizhou Port and Shipping Administration Bureau, Taizhou 318001, China |
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| Abstract: | The elevation, current, salinity and suspended sediment concentration (SSC) data were observed during spring and neap tides in the Jiaojiang Estuary. The spatial and temporal characteristics of tides, salinity and SSC in the main tidal channel of the estuary were studied, and the stratification physical mechanism under the action of high turbidity and strong tides was explained, using the field data. SSC and salinity during spring tides were higher than those during neap tides, and SSC during ebb periods was higher than the flood periods along the main channel. Salinity varied with the tidal currents, and the salinity water front appeared around the Station S2. A turbidity maximum zone appeared near the salt water front. SSC decreased and the salinity increased towards the sea. SSC and salinity increased with the water depth. According to the Richardson number and mixing parameters, stratification caused by salinity and SSC changes with tides. Stratification during flood periods was stronger than during ebb periods. Stratification lasted the longest time and was more extensive during neap tides. The mixing parameter varied with the tidal periods, and the value was high/below the critical value of 1.0 during spring/neap tides. The tidal strain term was an important role for the change rate of the potential energy anomaly. The stratified state changed to a mixed state during neap tides, while the opposite change occurred during flood tides. |
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