Identify Wave Group Vortices

Todays goal is to take yet another step back and ignore the aspect of vorticity timescales (relating to sediment transport & perturbations). Instead Im trying to look at differences in vorticity signals to see if wave group vortices can be separated from other low frequency motions.

Model Runs:
1. Recreated Fowler & Dalrymple 1990 (two intersecting wave trains with slightly different frequencies and opposite angles) to look at the signal of 'migrating' rip currents.

2. Create an unstable current and re-evaluate shear wave signals.

3. Use an offshore wave height generated from a very narrow banded (f and theta) spectrum.

4. Continue to broaden the spectrum.

5. Make the peak directio oblique and look at any changes.

Other things to check:
1. Calculate the 'Groupiness Factor (GF)' used in List 1991, and Haller et al. 1999 to see if the time series I've made have groupiness comparable to field conditions (~0.75 ??)

2. Low pass the velocity time series using 1000s instead of 250s since thats what expect necessary to carve a significant perturbation?

3. Shear waves always have a an alongshore propagation speed (V) as do migrating rip currents. In cases of normally incident 'groupy' waves the vorticity generated would not have that...can we distinguish by speed?