Increased aerodynamic roughness owing to surfzone foam

Increased aerodynamic roughness owing to surfzone foam AbstractDrag coefficients (Cd) obtained through direct eddy-covariance estimates of the wind stress were observed at four different sandy beaches with dissipative surf zones along the coastline of Monterey Bay, CA, USA. The measured surfzone Cd (~2×10-3) is twice as large as open ocean estimates and consistent with recent estimates of Cd over the surf zone and shoaling region. Owing to the heterogeneous nature of the nearshore consisting of non-breaking shoaling waves and breaking surfzone waves, the surfzone wind stress source region is estimated from the footprint probability distribution derived for stable and unstable atmospheric conditions. An empirical model developed for estimating the Cd for open ocean foam coverage dependent on wind speed, is modified for foam coverage owing to depth-limited wave breaking within the surf zone. A modified empirical Cd model for surf zone foam predicts similar values as the measured Cd and provides an alternative mechanism to describe roughness. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

Increased aerodynamic roughness owing to surfzone foam

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0485
D.O.I.
10.1175/JPO-D-17-0054.1
Publisher site
See Article on Publisher Site

Abstract

AbstractDrag coefficients (Cd) obtained through direct eddy-covariance estimates of the wind stress were observed at four different sandy beaches with dissipative surf zones along the coastline of Monterey Bay, CA, USA. The measured surfzone Cd (~2×10-3) is twice as large as open ocean estimates and consistent with recent estimates of Cd over the surf zone and shoaling region. Owing to the heterogeneous nature of the nearshore consisting of non-breaking shoaling waves and breaking surfzone waves, the surfzone wind stress source region is estimated from the footprint probability distribution derived for stable and unstable atmospheric conditions. An empirical model developed for estimating the Cd for open ocean foam coverage dependent on wind speed, is modified for foam coverage owing to depth-limited wave breaking within the surf zone. A modified empirical Cd model for surf zone foam predicts similar values as the measured Cd and provides an alternative mechanism to describe roughness.

Journal

Journal of Physical OceanographyAmerican Meteorological Society

Published: Jun 20, 2017

References

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