The youtube movie below shows Log10 dye concentration (no units) at New River Inlet released just up the inlet over t=2-4 hr. This simulation is forced by the M2 tide and has no stratification, no wind, and no waves. Top: time series of tidal elevation at (x,y)=(0,0) m. The red dashed line represents the current time location. Bottom: plan view of Log10 surface dye concentration. Only a subset of the model domain is shown. Land values are white and dashed lines represent bathymetry contours (2, 4, 6, 8, 10, 12 m depth). The colorbar gives log10 concentration: Check the video below:
I also looked at the bottom dye concentration. Although there are subtle differences the movies look pretty much the same. For these purposes this unstratified simulation is pretty well-mixed.
At first release, the dye jets about 2 km offshore of the inlet mouth. There is a significant amount of dye flux back into the inlet. However, this may be a result of no wind, no waves, no alongshore tidal propagation, and no other shelf-scale forcing mechanisms that drive shelf-scale alongshore currents.
If folks are interested in the .mp4 video file (better resolution) it can be downloaded via NRI_dye_surface_delft3d
Please feel free to leave comments and suggestions. -falk