| 摘要: |
| 2020年黄河丰水期入海径流量是往年平均值的2倍以上,必然会引起河口水动力和盐度分布的动态变化。本作者基于有限体积海岸海洋模型(Finite Volume Community Ocean Model,FVCOM),模拟2020年黄河冲淡水在丰水期和枯水期的扩散情况,研究黄河口以及莱州湾海域的盐度分布状况变化,以及径流量变化和口门变迁对黄河冲淡水扩散的影响,模型结果与观测结果吻合较好。模拟结果表明,黄河口西北侧潮流沿岸线方向,随着涨落潮呈西北-东南向往复;黄河口以南包括莱州湾的潮流均随着涨落潮呈东北-西南方向往复。高流速区域主要集中在黄河口和莱州湾北部,在0.5 m/s以上。在余流作用下,大量的黄河冲淡水会涌入莱州湾,丰水期时27psu等盐线包络面积占到整个莱州湾的1/4左右。径流量和风的变化主要影响羽流的扩散面积,而口门的变迁会改变其扩散方向。黄河冲淡水经北向口门入海主要影响莱州湾区域,经东向口门入海更多地会向北扩散。通过对2020年黄河口及莱州湾海域盐度分布的分析,为黄河入海径流管理及莱州湾渔业资源保护提供科学参考。 |
| 关键词: 盐度扩散 黄河羽流 莱州湾 有限体积海岸海洋模型 |
| DOI：10.11759/hykx20211124001 |
| 分类号:TV149 |
| 基金项目:NSFC-山东联合重点基金资助项目(U1806227,U1706220);国家自然科学基金资助项目(51909114) |
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| The effects of gate and runoff changes on salinity distribution around Laizhou Bay |
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QIAO Shou-wen1,2, LI Fan3, QIN Hua-wei3, SHI Hong-yuan2
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1.The Ocean University of China, College of Oceanography and Atmosphere, Qingdao 266100, China;2.Ludong University College of Hydraulic Engineering, Yantai 264025, China;3.Shandong Marine Resources and Environment Research Institute, Shandong Key Laboratory of Marine Ecological Restoration, Yantai 265500, China
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| Abstract: |
| The runoff into the sea in the Yellow River during the wet season in 2020 is more than twice the average value of previous years, which will definitely lead to dynamic changes in estuarine dynamics and salinity distribution. Based on Finite Volume Community Ocean Model, this study simulates the diffusion of fresh water from the Yellow River during the wet and dry seasons in 2020, as well as investigates the changes in the salinity distribution of the Yellow River Estuary and Laizhou Bay and the effects of runoff modifications and gate changes on the aforementioned diffusion. The model results are in good agreement with the observation results. The simulation demonstrates that the direction of the tidal current in the northwest of the Yellow River estuary is along the shoreline, reciprocating in the northwest to southeast direction with the ebb and flow of the tide. Furthermore, the direction of the tidal current in the southern part of the Yellow River estuary, including Laizhou Bay, reverses from northeast to southwest. The high velocity area is primarily focused around the Yellow River Estuary and the north of Laizhou Bay, with speeds exceeding 0.5 m/s. A huge volume of fresh water from the Yellow River will flow into Laizhou Bay due to the effect of residual current, and the area with a salinity of <27 psu accounts for ~1/4 of the entire Laizhou Bay during the wet season. The change in runoff primarily influences the diffusion area of a plume, while the change in the gate will change its diffusion direction. |
| Key words: salinity diffusion Yellow River plume Laizhou bay FVCOM |
