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NOAA Wave Watch III (NWW3) Ocean Wave Model

NOAA

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SUMMARY

Publisher
NOAA
Source
Forecast
Abstract
WAVEWATCH III® (Tolman 1997, 1999a, 2009) is a third generation wave model developed at NOAA/NCEP in the spirit of the WAM model (WAMDIG 1988, Komen et al. 1994). It is a further development of the model WAVEWATCH, as developed at Delft University of Technology (Tolman 1989, 1991a) and WAVEWATCH II, developed at NASA, Goddard Space Flight Center (e.g., Tolman 1992). WAVEWATCH III®, however, differs from its predecessors in many important points such as the governing equations, the model structure, the numerical methods and the physical parameterizations.
Furthermore, with model version 3.14, WAVEWATCH III® is evolving from a wave model into a wave modeling framework, which allows for easy development of additional physical and numerical approaches to wave modeling.
WAVEWATCH III® solves the random phase spectral action density balance equation for wavenumber-direction spectra. The implicit assumption of this equation is that properties of medium (water depth and current) as well as the wave field itself vary on time and space scales that are much larger than the variation scales of a single wave. With version 3.14 some source term options for extremely shallow water (surf zone) have been included, as well as wetting and drying of grid points. Whereas the surf-zone physics implemented so far are still fairly rudimentary, it does imply that the wave model can now be applied to arbitrary shallow water.
The latest version of WAVEWATCH III® is 4.18, released on 19 March 2014. Source code access can be requested under the Source Code Distribution tab on this page. The manual (pdf) can be viewed here.
We are also releasing a new version of our grid generating software gridgenv2.0. This updated software can now generate bathymetry, mask and obstruction grids for rectilinear as well as curvilinear grids. To make the functions generic significant changes have been made to the function calls.
A portable package of scripts and Fortran code are provided to perform genetic optimization of the free parameters of the Generalized Multiple DIA in WAVEWATCH III. The package has been designed to work with v4.18 [More...]
Description
We have made an example, where we use ww3 data from our Datahub to compare it with different model datasets we have, go and get it from our GitHub: https://github.com/planet-os/notebooks/blob/master/api-examples/model-comparisons.ipynb/n We also have an example where we compare NOAA Wave Watch 3 and NDBC Buoy data https://github.com/planet-os/notebooks/blob/master/api-examples/ndbc-wavewatch-iii.ipynb /n and here is the example of plotting ww3 data: https://github.com/planet-os/notebooks/blob/master/api-examples/wavewatch-iii-global-api.ipynb
Refreshed
Mar 21, 2019 at 20:03 UTC 2 hours ago
Update Frequency
6 hours
Product Type
Forecast
Feature Type
GRID
Spatial Reference System
WGS84
Temporal Resolution
3 hours
Spatial Resolution
1 degree

EXTENT

Vertical
Ocean surface
Start Date
Dec 21, 2018 at 12:00 UTC
End Date
Mar 29, 2019 at 00:00 UTC

DISTRIBUTION

Distribution Format(s)
NetCDF4
Online Resource(s)
ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/wave/prod/

VARIABLES (15)

Vocabulary (version) CF 28.0
Variable
Long name
Unit
API Query
Wind_speed_surface
Wind speed @ Ground or water surface
m/s

JSON

CSV

Direction_of_wind_waves_surface
Direction of wind waves @ Ground or water surface
degree_true

JSON

CSV

Significant_height_of_wind_waves_surface
Significant height of wind waves @ Ground or water surface
m

JSON

CSV

Mean_period_of_wind_waves_surface
Mean period of wind waves @ Ground or water surface
s

JSON

CSV

u-component_of_wind_surface
u-component of wind @ Ground or water surface
m/s

JSON

CSV

Primary_wave_direction_surface
Primary wave direction @ Ground or water surface
degree_true

JSON

CSV

Significant_height_of_swell_waves_ordered_sequence_of_data
Significant height of swell waves
m

JSON

CSV

Wind_direction_from_which_blowing_surface
Wind direction (from which blowing) @ Ground or water surface
degree_true

JSON

CSV

Secondary_wave_direction_surface
Secondary wave direction @ Ground or water surface
degree_true

JSON

CSV

Direction_of_swell_waves_ordered_sequence_of_data
Direction of swell waves
degree_true

JSON

CSV

v-component_of_wind_surface
v-component of wind @ Ground or water surface
m/s

JSON

CSV

Primary_wave_mean_period_surface
Primary wave mean period @ Ground or water surface
s

JSON

CSV

Mean_period_of_swell_waves_ordered_sequence_of_data
Mean period of swell waves @ Ordered Sequence of Data
s

JSON

CSV

Secondary_wave_mean_period_surface
Secondary wave mean period @ Ground or water surface
s

JSON

CSV

Significant_height_of_combined_wind_waves_and_swell_surface
Significant height of combined wind waves and swell @ Ground or water surface
m

JSON

CSV

More...

DIMENSIONS (5)

Vocabulary (version) CF 28.0
Dimension
Long name
Unit
ordered_sequence_of_data
Primary or secondary swell
count
lon
degrees_east
time
GRIB forecast or observation time
Hour since 2019-03-21T12:00:00Z
reftime
GRIB reference time
Hour since 2019-03-21T12:00:00Z
lat
latitude
degrees_north

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