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The waver package was developed to provide R code for
the calculation of fetch length - the open water distance over which
wind can blow along a given direction - and predict wave energy based on
the calculated fetch and user-supplied wind and wave monitoring
data.
The fetch_len and fetch_len_multi functions
serve to calculate fetch at single or multiple locations, respectively.
These functions accept vector spatial datasets (points, lines and
polygons), either in the sf or sp format, and in either projected or
unprojected (long/lat) coordinates. Users can specify the bearings for
which fetch should be calculated, the number of radii to draw at each
bearing (and their angular separation), as well as the maximum fetch
length to consider.
These functions are based on existing algorithms published by the USGS[1] and Natural Capital Project[2]. Those tools are implemented in ArcGIS with Python code and use raster land layers instead of vector spatial data.
The wave_energy function calculates the wave energy flux
from either (a) the significant wave height and peak period, as provided
by wave models such as NOAA’s WAVEWATCH III;
or (b) the wind speed, fetch and water depth. The latter calculation is
based on the method presented in the US Army Corps of Engineers Coastal
Engineering Manual[3].
[1] J. Rohweder et al. (2008) “Application of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects.” USGS report. http://www.umesc.usgs.gov/management/dss/wind_fetch_wave_models.html
[2] InVEST Coastal Vulnerability Model. http://data.naturalcapitalproject.org/invest-releases/documentation/2_2_0/coastal_vulnerability.html
[3] Resio, D.T., Bratos, S.M., and Thompson, E.F. (2003). Meteorology and Wave Climate, Chapter II-2. Coastal Engineering Manual. US Army Corps of Engineers, Washington DC, 72pp.
This work was supported by the National Socio-Environmental Synthesis Center (SESYNC) under funding received from the National Science Foundation DBI-1052875.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.