| Chang Yang,Chen Yining,Li Yan. 2019. Flow modification associated with mangrove trees in a macro-tidal flat, southern China. Acta Oceanologica Sinica, 38(2):1－10 |
| Flow modification associated with mangrove trees in a macro-tidal flat, southern China |
| 我国南方强潮海岸红树植物对潮流的调制作用 |
| Received:September 17, 2017 |
| DOI：10.1007/s13131-018-1163-y |
| Key words:mangrove trees flow energy dissipation vertical structure |
| 中文关键词: 红树林 流速 能量耗散 垂向结构 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41006047 and 41776096; the Fundamental Research Fund of the Second Institute of Oceanography, State Oceanic Administration of China under contract No. JT1505. |
| Author Name | Affiliation | E-mail | | Chang Yang | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Chen Yining | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
State Key Laboratory of Marine and Environmental Science, Xiamen University, Xiamen 361005, China | yiningchen5410@hotmail.com | | Li Yan | Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
State Key Laboratory of Marine and Environmental Science, Xiamen University, Xiamen 361005, China | |
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| Abstract: |
| Limited studies have investigated the modification of tidal currents by mangrove trees. In particular, the impacts of mangrove trees on a vertical velocity profile remain unclear. An automatic system is developed to observe the vertical velocity profiles within a mangrove forest composed of artificially introduced Kandelia obovata located on the Ximen Island, the southern Zhejiang Province. The results reveal low flow velocities throughout the vertical profile within the mangrove forest. The vertical profile shows an overall decrease of the velocity with an increasing height above the bed. This pattern is due to the vertical increase of the drag force by the trunks and tree canopies. In addition, the turbulent energy density also varies vertically, corresponding to the vertical structure of the mangrove trees. In comparison with the vertical structure of flows within bare mudflats (semi-logarithmic) and salt marshes (nearly J-shape), the mangrove trees are shown to have a considerable impact on the vertical velocity profile in different ways. |
| 中文摘要: |
| 至今，关于红树植物对潮流的调制作用的研究非常有限，尤其是红树植物对垂向流速剖面的影响还不清楚。本研究利用自主研发的自动升降架于大潮期间对浙江南部乐清湾西门岛秋茄种植区的红树林滩进行垂向多点观测。结果表明，在所研究的红树林内，整个垂向剖面的流速普遍较低。树干和冠层引起的拖曳力在垂向上的增加，使得红树林内垂向流速剖面呈现"流速随距底高度增大而减小"的规律。此外，湍流能量密度在垂向上也呈现出与红树植物垂向结构相对应的变化。与光滩（半对数）和盐沼（近"J"形）内流速的垂向结构相比，红树植物以一种不同的方式对垂向流速剖面产生重要影响。 |
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