Article Type:
Research Article

Impact of the Reduced Drag Coefficient on Ocean Wave Modeling under Hurricane Conditions

Il-Ju Moon College of Ocean Science, Cheju National University, Jejusi, South Korea

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Isaac Ginis Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island

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Tetsu Hara Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island

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Print Publication:
01 Mar 2008
DOI:
https://doi.org/10.1175/2007MWR2131.1
Page(s):
1217–1223
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Abstract

Effects of new drag coefficient (Cd) parameterizations on WAVEWATCH III (WW3) model surface wave simulations are investigated. The new parameterizations are based on a coupled wind–wave model (CWW) and a wave tank experiment, and yields reduced Cd at high wind speeds. Numerical experiments for uniform winds and Hurricane Katrina (2005) indicate that the original Cd parameterization used in WW3 overestimates drag at high wind speeds compared to recent observational, theoretical, and numerical modeling results. Comparisons with buoy measurements during Hurricane Katrina demonstrate that WW3 simulations with the new Cd parameterizations yield more accurate significant wave heights compared to simulations with the original Cd parameterization, provided that accurate high-resolution wind forcing fields are used.

Corresponding author address: Il-Ju Moon, College of Ocean Science, Cheju National University, Aradong, Jejusi, Jejudo 690-756, South Korea. Email: ijmoon@cheju.ac.kr

Abstract

Effects of new drag coefficient (Cd) parameterizations on WAVEWATCH III (WW3) model surface wave simulations are investigated. The new parameterizations are based on a coupled wind–wave model (CWW) and a wave tank experiment, and yields reduced Cd at high wind speeds. Numerical experiments for uniform winds and Hurricane Katrina (2005) indicate that the original Cd parameterization used in WW3 overestimates drag at high wind speeds compared to recent observational, theoretical, and numerical modeling results. Comparisons with buoy measurements during Hurricane Katrina demonstrate that WW3 simulations with the new Cd parameterizations yield more accurate significant wave heights compared to simulations with the original Cd parameterization, provided that accurate high-resolution wind forcing fields are used.

Corresponding author address: Il-Ju Moon, College of Ocean Science, Cheju National University, Aradong, Jejusi, Jejudo 690-756, South Korea. Email: ijmoon@cheju.ac.kr

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  • Chao, Y. Y., J. H. G. M. Alves, and H. L. Tolman, 2005: An operational system for predicting hurricane-generated wind waves in the North Atlantic Ocean. Wea. Forecasting, 20 , 652–671.

    • Search Google Scholar
    • Export Citation

  • Donelan, M. A., 1990: Air–sea interaction. The Sea, B. Le Mehaute and D. M. Hanes, Eds., Ocean Engineering Science, Vol. 9B, Wiley and Sons, 239–292.

    • Search Google Scholar
    • Export Citation

  • Donelan, M. A., B. K. Haus, N. Reul, W. J. Plant, M. Stiassnie, H. C. Graber, O. B. Brown, and E. S. Saltzman, 2004: On the limiting aerodynamic roughness of the ocean in very strong winds. Geophys. Res. Lett., 31 .L18306, doi:10.1029/2004GL019460.

    • Search Google Scholar
    • Export Citation

  • Drennan, W. M., H. C. Graber, D. Hauser, and C. Quentin, 2003: On the wave age dependence of wind stress over pure wind seas. J. Geophys. Res., 108 .8062, doi:10.1029/2000JC000715.

    • Search Google Scholar
    • Export Citation

  • Emanuel, K. A., 2003: A similarity hypothesis for air–sea exchange at extreme wind speeds. J. Atmos. Sci., 60 , 1420–1428.

  • Hara, T., and S. E. Belcher, 2002: Wind forcing in the equilibrium range of wind-wave spectra. J. Fluid Mech., 470 , 223–245.

  • Hara, T., and S. E. Belcher, 2004: Wind profile and drag coefficient over mature ocean surface wave spectra. J. Phys. Oceanogr., 34 , 2345–2358.

    • Search Google Scholar
    • Export Citation

  • Moon, I-J., I. Ginis, T. Hara, H. Tolman, C. W. Wright, and E. J. Walsh, 2003: Numerical simulation of sea surface directional wave spectra under hurricane wind forcing. J. Phys. Oceanogr., 33 , 1680–1706.

    • Search Google Scholar
    • Export Citation

  • Moon, I-J., T. Hara, I. Ginis, S. E. Belcher, and H. Tolman, 2004a: Effect of surface waves on air–sea momentum exchange. Part I: Effect of mature and growing seas. J. Atmos. Sci., 61 , 2321–2333.

    • Search Google Scholar
    • Export Citation

  • Moon, I-J., I. Ginis, and T. Hara, 2004b: Effect of surface waves on air–sea momentum exchange. Part II: Behavior of drag coefficient under tropical cyclones. J. Atmos. Sci., 61 , 2334–2348.

    • Search Google Scholar
    • Export Citation

  • Moon, I-J., I. Ginis, and T. Hara, 2004c: Effect of surface waves on Charnock coefficient under tropical cyclones. Geophys. Res. Lett., 31 .L20302, doi:10.1029/2004GL020988.

    • Search Google Scholar
    • Export Citation

  • Moon, I-J., I. Ginis, T. Hara, and B. Thomas, 2007: A physics-based parameterization of air–sea momentum flux at high wind speeds and its impact on hurricane intensity predictions. Mon. Wea. Rev., 135 , 2869–2878.

    • Search Google Scholar
    • Export Citation

  • Powell, M. D., S. H. Houston, L. R. Amat, and N. Morisseau-Leroy, 1998: The HRD real-time hurricane wind analysis system. J. Wind Eng. Ind. Aerodyn., 77–78 , 53–64.

    • Search Google Scholar
    • Export Citation

  • Powell, M. D., P. J. Vickery, and T. A. Reinhold, 2003: Reduced drag coefficient for high wind speeds in tropical cyclones. Nature, 422 , 279–283.

    • Search Google Scholar
    • Export Citation

  • Tolman, H. L., 2002: Validation of WAVEWATCH III version 1.15 for a global domain. NOAA/NWS/NCEP/OMB Tech. Note 213, 33 pp.

  • Tolman, H. L., and D. Chalikov, 1996: Source terms in a third-generation wind wave model. J. Phys. Oceanogr., 26 , 2497–2518.

  • Tolman, H. L., and J. H. G. M. Alves, 2005: Numerical modeling of wind waves generated by tropical cyclones using moving grids. Ocean Modell., 9 , 305–323.

    • Search Google Scholar
    • Export Citation

  • Tolman, H. L., J. H. G. M. Alves, and Y. Y. Chao, 2005: Operational forecasting of wind-generated waves by hurricane Isabel at NCEP. Wea. Forecasting, 20 , 544–557.

    • Search Google Scholar
    • Export Citation

  • WAMDI Group, 1988: The WAM model—A third generation ocean wave prediction model. J. Phys. Oceanogr., 18 , 1775–1810.

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