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Tidal-Scale Hydrodynamics within Mangrove Swamps

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Abstract

Both the drag force and the horizontal eddy viscosity play a dominant role in the tidal-scale hydrodynamics in mangrove wetlands. Using field observations and basic fluid mechanics laws, the drag coefficient and the coefficient of dynamic eddy viscosity are found to be predictable as a function of the Reynolds Number based on the characteristic length scale of the vegetation. The characteristic length scale of the vegetation varies greatly with vegetation species, vegetation density and tidal elevation. Both these coefficients decrease with increasing values of the Reynolds Number. At the low range of the Reynolds Number both these coefficients reach much higher values than those typical of vegetation-poor estuaries and rivers. Consequently, the tidal flow within mangrove areas depends to a large degree upon the submerged vegetation density that varies with the tidal stage. These findings may be applied also in other vegetated tidal wetlands, including salt marshes.

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Author information

Authors and Affiliations

  1. School of Marine Science and Technology, Tokai University, 3-20-1, 424-8610, Shimizu-Orido Shizuoka, Japan

    Yoshihiro Mazda

  2. Coastal Studies Institute and Department of Oceanography and Coastal Sciences, Louisiana State University, 70803, Baton Rouge, LA, USA

    Daijiro Kobashi

  3. Marine Science Department, Nippon Marine Enterprises, Ltd., C/O JAMSTEC, 2-15, Natsushima, 237-0061, Yokohama, Kanagawa, Japan

    Satoshi Okada

Authors
  1. Yoshihiro Mazda
  2. Daijiro Kobashi
  3. Satoshi Okada

Corresponding author

Correspondence toYoshihiro Mazda.

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