Flow and Drag in a Seagrass Bed
Flow and Drag in a Seagrass Bed
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海草床中的流动和阻力
DOI:
10.1029/2018jc014862
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Dunbar, Robert B.
中科院分区:
文献类型:
--
作者:
Monismith, Stephen G.;Hirsh, Heidi;Batista, Natasha;Francis, Holly;Egan, Galen;Dunbar, Robert B.
We report direct measurement of drag forces due to tidal flow over a submerged seagrass bed in Ngeseksau Reef, Koror State, Republic of Palau. In our study, drag is computed using an array of high‐resolution pressure measurements, from which values of the drag coefficients,CD, referenced to measured depth‐averaged velocities,V, were inferred. Reflecting the fact that seagrass blades deflect in the presence of flow, we find thatCDis O(1) when flows are weak and tends toward a value of 0.03 at the highest velocities, behavior that is consistent with existing theory for canopy flows with flexible canopy elements. A limited subset of velocity profiles obey the law of the wall, producing values of shear velocity that, while noisy, broadly agree with values inferred from the pressure measurements.
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DOI:
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期刊:
影响因子:
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DOI:
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发表时间:
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期刊:
The Biological Bulletin
影响因子:
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