GUIDE WAVE ANALYSIS AND FORECASTING - WMO
GUIDE WAVE ANALYSIS AND FORECASTING - WMO
GUIDE WAVE ANALYSIS AND FORECASTING - WMO
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120<br />
Abbreviation/ Definition<br />
Symbol<br />
ANNEX I<br />
hb Breaking depth; water depth at which a wave of given height breaks — m<br />
hPa hectoPascal — unit of pressure<br />
H High pressure centre<br />
H<br />
–<br />
H<br />
Wave height — m (ft)<br />
Average wave height in a record — m (ft)<br />
Hb Breaker wave height — m (ft)<br />
Hc Characteristic wave height (average height of the larger well-formed waves, observed<br />
visually) — m (ft)<br />
Hcombined Wave height for total wave field — m (ft)<br />
Hmax, Hm, Hmax,3h Hm0 Maximum wave height for specified period of time — m (ft)<br />
Wave height derived from energy spectrum, approximately equal to – H1/3; Hm0 = 4 m 1/2<br />
0 —<br />
m (ft)<br />
Hrms Root-mean-square wave height = (8 E/ρwg) 1/2 Hs — m (ft)<br />
Significant wave height = Hm0 or – H1/3, according to specification — m (ft)<br />
HsN, Hs50 N-year, 50-year return value of Hs — m (ft)<br />
Hsea Wind wave height — m (ft)<br />
Hswell Swell height — m (ft)<br />
Hz Zero-crossing wave height (the vertical distance between the highest and lowest value of the<br />
–<br />
H1/n –<br />
H1/3 wave record between two zero-downcrossings or upcrossings)<br />
The average height of the 1/n highest waves — m (ft)<br />
Significant wave height: average of the 1/3 highest waves in a record (approximates to the<br />
characteristic wave height) — m (ft)<br />
Hz Hertz, measure of frequency = 1 cycle per second — s –1<br />
HF High Frequency<br />
HMSO Her Majesty's Stationary Office (UK)<br />
I, (ui, vi) Isallobaric wind vector<br />
IAHR International Association for Hydraulic Research (Delft, Netherlands)<br />
J Wave power — kW/m (of wavefront)<br />
JMA Japan Meteorological Agency<br />
JONSWAP Joint North Sea Wave Proj ect<br />
k; k Wavenumber (2π/λ); vector wavenumber — m –1<br />
km Unit of length, kilometre<br />
kn Unit of speed, knot (1.94 kn = 1 m/s)<br />
kW Unit of power, kilowatt<br />
K Mixing coefficient<br />
Kr Refraction factor<br />
Ks Shoaling factor<br />
KNMI Royal Netherlands Meteorological Institute<br />
L Low pressure centre<br />
L Monin-Obukhov mixing length — m<br />
m Unit of length, metre<br />
mks Metric system of units based on the metre, kilogram and second as the units of length, mass<br />
and time; it forms the basis of the International System of Units (SI)<br />
mn The n-th order moment of the wave spectrum<br />
m0 Moment of zero order; represents the integral of a wave spectrum<br />
m/s Unit of speed, metre per second<br />
ME Mean error