4.7 Article

Flow and Drag in a Seagrass Bed

Journal

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume 124, Issue 3, Pages 2153-2163

Publisher

AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JC014862

Keywords

nearshore processes; surface waves and tides; turbulence; diffusion; and mixing processes; coastal processes; physical and biogeochemical interactions

Categories

Funding

  1. NSF [OCE-1536502, OCE-1737096]
  2. Stanford University through the Bing Overseas Study Program
  3. Stanford University
  4. NSF

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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, C-D, referenced to measured depth-averaged velocities, V, were inferred. Reflecting the fact that seagrass blades deflect in the presence of flow, we find that C-D is 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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