A Hurricane Boundary Layer and Wind Field Model for Use in Engineering Applications
Tóm tắt
This article examines the radial dependence of the height of the maximum wind speed in a hurricane, which is found to lower with increasing inertial stability (which in turn depends on increasing wind speed and decreasing radius) near the eyewall. The leveling off, or limiting value, of the marine drag coefficient in high winds is also examined. The drag coefficient, given similar wind speeds, is smaller for smaller-radii storms; enhanced sea spray by short or breaking waves is speculated as a cause. A fitting technique of dropsonde wind profiles is used to model the shape of the vertical profile of mean horizontal wind speeds in the hurricane boundary layer, using only the magnitude and radius of the “gradient” wind. The method slightly underestimates the surface winds in small but intense storms, but errors are less than 5% near the surface. The fit is then applied to a slab layer hurricane wind field model, and combined with a boundary layer transition model to estimate surface winds over both marine and land surfaces.
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Tài liệu tham khảo
Bye, 2006, Drag coefficient reduction at very high wind speeds., J. Geophys. Res., 111, C03024, 10.1029/2005JC003114
Chow, S. H. , 1971: A study of wind field in the planetary boundary layer of a moving tropical cyclone. M.S. thesis, School of Engineering and Science, New York University, 59 pp.
Deaves, 1981, Computation of wind flow over changes in surface roughness., J. Wind Eng. Ind. Aerodyn., 7, 65, 10.1016/0167-6105(81)90068-4
Engineering Sciences Data Unit (ESDU), 1982, Strong winds in the atmospheric boundary layer, Part 1: Mean hourly wind speed.
Franklin, 2003, GPS dropwindsonde wind profiles in hurricanes and their operational implications., Wea. Forecasting, 18, 32, 10.1175/1520-0434(2003)018<0032:GDWPIH>2.0.CO;2
Georgiou, Design wind speeds in regions dominated by tropical cyclones., J. Wind. Eng. Ind. Aerodyn., 13, 139, 10.1016/0167-6105(83)90136-8
Gilhousen, 2006, A complete explanation of why moored buoy winds are less than ship winds.
Hock, 1999, The NCAR GPS dropwindsonde., Bull. Amer. Meteor. Soc., 80, 407, 10.1175/1520-0477(1999)080<0407:TNGD>2.0.CO;2
Holland, 1980, An analytical model of wind and pressure profiles in hurricanes., Mon. Wea. Rev., 108, 1212, 10.1175/1520-0493(1980)108<1212:AAMOTW>2.0.CO;2
Kao, 1974, The structure of the two-dimensional internal boundary layer over a sudden change of surface roughness., J. Atmos. Sci., 31, 738, 10.1175/1520-0469(1974)031<0738:TSOTTD>2.0.CO;2
Kepert, 2001, The dynamics of boundary layer jets within the tropical cyclone core. Part I: Linear theory., J. Atmos. Sci., 58, 2469, 10.1175/1520-0469(2001)058<2469:TDOBLJ>2.0.CO;2
Kepert, 2006, Observed boundary layer wind structure and balance in the hurricane core. Part I: Hurricane Georges., J. Atmos. Sci., 63, 2169, 10.1175/JAS3745.1
Kepert, 2006, Observed boundary layer wind structure and balance in the hurricane core. Part II: Hurricane Mitch., J. Atmos. Sci., 63, 2194, 10.1175/JAS3746.1
Kepert, 2001, The dynamics of boundary layer jets within the tropical cyclone core. Part II: Non-linear enhancements., J. Atmos. Sci., 58, 2485, 10.1175/1520-0469(2001)058<2485:TDOBLJ>2.0.CO;2
Large, 1981, Open ocean momentum flux measurements in moderate to strong winds., J. Phys. Oceanogr., 11, 324, 10.1175/1520-0485(1981)011<0324:OOMFMI>2.0.CO;2
Makin, 2005, A note on the drag of the sea surface at hurricane winds., Bound.-Layer Meteor., 115, 169, 10.1007/s10546-004-3647-x
Powell, 1996, Hurricane Andrew’s landfall in south Florida. Part I: Standardizing measurements for documentation of surface wind fields., Wea. Forecasting, 11, 303
Powell, 1998, The HRD real-time hurricane wind analysis system., J. Wind Eng. Ind. Aerodyn., 77, 53, 10.1016/S0167-6105(98)00131-7
Powell, 2003, Reduced drag coefficients for high wind speeds in tropical cyclones., Nature, 422, 279, 10.1038/nature01481
Schwerdt, 1979, Meteorological criteria for standard project hurricane and probable maximum hurricane wind fields, Gulf and East Coasts of the United States.
Simiu, 1996, Wind Effects on Structures.
Thompson, 1996, Practical modeling of hurricane surface wind fields., J. Waterw. Port Coast. Ocean Eng., 122, 195, 10.1061/(ASCE)0733-950X(1996)122:4(195)