Re: [ferret_users] Along-shore and cross-shore windstress calculation

[vivek shilimkar <vivek.shilimkar@xxxxxxxxx>]

Dear Dr. Ryo and William,

Thank you so much for your reply.

I understand the Dr. William's method very quickly and prefer to use that.

Regards!

Vivek

On Wed, Jun 27, 2018 at 11:40 PM Ryo Furue <furue@xxxxxxxxxx> wrote:

Vivek and Billy,

On Wed, Jun 27, 2018 at 9:31 PM William Kessler <william.s.kessler@xxxxxxxx> wrote:

Attached is a scan of some old notes, not code. It's pretty straightforward to code once you do the trigonometry (that's what's in these notes).

My method (../fu_2013/msg00345.html) just calculates cos θ and sin θ in Billy's notes.  My idea is based on the fact that the "coastline" is the isobath of z = 0.  So, if you have an elevation/bathymetry data like ETOPO5, you can calculate the direction (θ) of the isobath from the gradient of the elevation.

All Billy's caveats apply to my method, too.

 

The trickiest part of a calculation like this is deciding what you mean by "coast": Is it the wind at the beach? Or 25, 50, 100km offshore? 

That has implications for how complicated your "coastline"