This function adds an inflow angle to the angle of the wind direction.
It calculates an inflow angle as a function of the distance from the
storm center to a location (Phadke et al. 2003), and then adds 20 degrees to
this inflow angle to account for the location being over land rather than
over water.
Usage
add_inflow(gwd, cdist, Rmax)
Arguments
gwd
A numeric vector giving direction of gradient wind at a location,
in degrees. Due east is 0 degrees, due north 90 degrees, etc.
cdist
A numeric vector giving radius (in kilometers) from the storm
center to the location being modeled.
Rmax
A numeric vector giving the radius to maximum winds (in kilometers)
for the tropical storm.
Value
Numeric vector with the gradient wind direction (in degrees),
adjusted with an inflow angle appropriate for being over land and for the
location's distance from the storm's center.
Details
This function uses equations 11a-c from Phadke et al. (2003).
References
Phadke AC, Martino CD, Cheung KF, and Houston SH. 2003. Modeling of
tropical cyclone winds and waves for emergency management. Ocean
Engineering 30(4):553-578.