新西兰旺加普阿河口海草（Zostera muelleri）对边界层流体力学的影响

4区地球科学 Q3 Earth and Planetary Sciences

Journal of Coastal Research Pub Date : 2024-03-29 DOI:10.2112/jcr-si50-126.1

K. Bryan, H. Tay, C. Pilditch, C. J. Lundquist, Heather L. Hunt

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引用次数: 18

摘要

Bryan, K. R. TAY, H. W, Pilditch, C. A., Lundquist, C. J. and H. L. 2007.新西兰 Whangapoua 河口海草（Zostera muelleri）对边界层水动力学的影响。Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 668 - 672.澳大利亚黄金海岸，ISSN 0749.0208 海草床（Zostera muelleri）在新西兰河口形成大面积（> 10 公顷）潮间带，可能会改变沉积物的颗粒和营养通量。在一个暴露于潮汐流（约 20 厘米/秒）和小风浪（显著高度 2-10 厘米）的地点，对海草（叶片长度 5-8 厘米，嫩枝密度约 60/0.01 米 2）对边界层动力学的影响进行了为期四天的研究，提供了各种波流组合。使用两个 ADV 测定了水流特性：一个固定在海床上方 15 厘米处，另一个则在冠层内和冠层上方的不同高度处。在不同的潮汐阶段，测量了补层内和补层边缘以及裸露沉积物上水流的垂直变化。惯性耗散法用于描述不同床面特征和水动力条件对耗散率造成的变化。结果表明，藻华藻改变了水流剖面的形状，使边界层向上延伸。波浪的存在造成了补片内部的巨大差异，似乎增加了床面的粗糙度。斑块外的耗散率随距离床面的远近而增加，而斑块内的耗散率则随距离床面的远近而增加。即使考虑到洪潮和退潮时平均流速的差异，也可以观察到消散率在来潮时更大。尽管藻类冠层边缘的突然过渡造成了更多的边界剖面变化，但在退潮和涨潮时，斑块边缘的海流剖面形状明显不同。

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The Effects of Seagrass (Zostera muelleri) on Boundary-layer Hydrodynamics in Whangapoua Estuary, New Zealand

BRYAN, K. R. TAY, H. W, PILDITCH, C. A., LUNDQUIST, C. J. AND HUNT H. L. 2007. The Effects of Seagrass (Zostera muelleri) on Boundary-Layer Hydrodynamics in Whangapoua Estuary, New Zealand. Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 668 – 672. Gold Coast, Australia, ISSN 0749.0208 Seagrass beds (Zostera muelleri) form extensive (> 10 Ha) intertidal beds in New Zealand estuaries potentially altering particle and nutrient fluxes to sediments. The effects of seagrass (blade length 5-8 cm, shoot density ~60/0.01m 2 ) on boundary layer dynamics were investigated at a site exposed to both tidal currents (~20 cm/s) and small wind waves (significant height 2-10 cm) over four days providing a variety of wave-current combinations. Flow characteristics were determined using two ADVs: one fixed at 15 cm above the bed and the other at varying heights within and above the canopy. The vertical variation of currents in and at the edge of the patch and on bare sediment during different tidal stages was measured. The inertial dissipation method was used to characterise changes to dissipation rate caused by varying bed character and hydrodynamic conditions. Results show that Z. muelleri altered the shape of the current profile by extending the boundary layer upward. The presence of waves caused substantial differences within the patch, appearing to increase the bed roughness. Dissipation rates outside the patch increased with proximity to the bed, whereas within the patch, they increased with distance from the bed. Dissipation rates were also observed to be greater on the incoming tide, even when differences in mean current speeds between flood and ebb tide were accounted for. Although the sudden transition at the edges of the Z. muelleri canopy caused more variable boundary profiles, the shape of the current profiles at the edge of the patch were clearly different on the ebb and the flood tides.

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来源期刊

Journal of Coastal Research 地学-地球科学综合

自引率

0.00%

发文量

审稿时长

3-8 weeks

期刊介绍： The Journal of Coastal Research (JCR) is one of the leading international journals for coastal studies and processes, and is published bi-monthly by the Coastal Education & Research Foundation [CERF]. By covering the entire field of coastal research, the JCR encompasses all subjects relevant to natural and engineered environments (freshwater, brackish, or marine) and the protection/management of their resources in the vicinity of coastlines of the world. Even though the journal broadly focuses on immediate shoreline zones, the JCR also embraces those coastal environments that either reach some indefinite distance inland or that extend seaward beyond the outer margins of the sublittoral (neritic) zone. The JCR disseminates accurate information to both the public and research specialists around the world on all aspects of coastal issues in an effort to maintain or improve the quality of our planet''s shoreline resources.