| 珠江磨刀门河口环流结构动力特征分析 |
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| 引用本文： | 卢陈,吴尧,杨裕桂,袁菲.珠江磨刀门河口环流结构动力特征分析[J].海洋学报,2022,44(12):9-18. |
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| 作者姓名： | 卢陈 吴尧 杨裕桂 袁菲 |
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| 作者单位： | 1.珠江水利委员会 珠江水利科学研究院，广东 广州 510611 |
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| 基金项目： | 国家自然科学基金青年基金(42006157)；水文水资源与水利工程科学国家重点实验室“一带一路”水与可持续发展科技基金(2020492111) |
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| 摘 要： | 河口环流结构关系到物质输运、泥沙沉积和地貌变化等物理过程。根据2019年磨刀门河口原型观测平台洪枯季连续观测分层潮流资料，统计洪枯季、大小潮河口东、西汊的涨落潮流及历时变化特征，利用理论方法解析河口东西汊平面环流和重力环流结构，进一步引入混合参数研究河口纵向环流中的潮汐应变环流。研究发现枯季东、西汊在转潮时刻存在东涨西落的平面环流结构，洪季平面环流特征较不明显；枯季重力环流强度整体略大于洪季，西汊重力环流强于东汊，表层向海环流流速可达0.2～0.25 m/s，而底层向陆环流流速相对较小。洪季大潮期由潮不对称性驱动的潮汐应变环流相对较大，进而增强了纵向环流的强度。河口垂向余流结构同样表现洪枯季、大小潮的变化规律。洪季余流整体较大，西汊在小潮期表层余流流速超过0.6 m/s，而东汊余流则明显呈现表层向海、底层向陆的分布特征，枯季余流整体较小，表明其对物质输运和河口地形塑造作用较弱。
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| 关 键 词： | 平面环流 重力环流 潮汐应变环流 物质输运 |
| 收稿时间： | 2022-04-16 |
Characterizing the circulation flow structure in the Modaomen Estuary of the Zhujiang River |
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| Affiliation: | 1.Pearl River Hydraulic Research Institute, Pearl River Water Resources Commission, Guangzhou 510611, China2.Key Laboratory of Pearl River Estuary Regulation and Protection, Guangzhou 510611, China3.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China4.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China |
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| Abstract: | The structure of circulation flow is related to physical processes such as material transport, sediment deposition and landform evolution. According to the continuous stratified tidal current data derived by the prototype observation platform of Modaomen Estuary in flood and dry seasons in 2019, the flow characteristic during the spring and neap tide at wet and dry seasons in the east and west branches were analyzed. Theoretical methods were used to explore plane circulation and gravity circulation structure in the east and west branches. Besides, the longitudinal circulation with the tidal strain circulation was explained by the mixed parameter. Plane circulation flow structure with ebb at west branch and rise at east branch during the dry season was found. Moreover, gravitational circulation at dry season was generally larger than that at wet season, and the gravitational circulation at west branch was stronger than the east branch, with 0.2–0.25 m/s surface velocity and much lower bottom velocity. The tidal strain circulation driven by the tidal asymmetry at wet season spring tide was relatively higher, which tends to favor the magnitude of vertical circulation. Additionally, the muti-layer residual current also displays seasonal and tidal variations. The residual current at wet season was relatively larger than the dry season, with the surface residual flow velocity more than 0.6 m/s during the neap tide at west branch. However, the downstream residual current at surface and upstream residual current at bottom was found at east branch. Much lower residual current velocity was found at dry season, indicating that the impact on the substance transport and morphological evolution was lower. |
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