NEARCOM tidal analysis – delta t from high tide to water ebb (w. Matt Spydell)

In the previous post on Delft3d model output,  we showed in one of the panels, the time it takes from high tide until the water starts to ebb.    Notationally this could be written as t_{high tide} – t_{Uebb},  where t_{Uebb} is the time when the alongchannel tidal velocity switches to ebb (out of the inlet).     This time lag is related … Read More

Delft3D model tidal analysis (w. Ad Reniers & Patrick Rynne)

In order to understand how to time drifter and dye releases, I’ve become preoccupied with the New River Inlet tidal currents and the phase lag relative to the tide level (call this eta).   As is well known a standing wave has a 90 deg (pi/2) phase lag between eta and velocity and a progressive wave has a 0 deg lag.    … Read More

Boat Races

If you have spent time in southern California, you may know what it means to “race for pink slips.” One fine day in May, the Falk-Guza (FG) and Britt-Steve (BS) groups will race boats for pink slips.  The FG boat, the “Pink Storm” already is pink (see photo below) and has a cool, but scary masthead. The BS boat, the … Read More

NEARCOM model analysis of Tides by Tom Hsu et al.

by Tom Hsu, Fengyan Shi, and Julie Chen (UDEL):  I just like to follow up with Falk’s comments on time series and phase lag between surface elevation and flow velocity magnitude. More information from the model run is attached. In this document, you will find time series at four different locations. Please also notice that in these figures, we show … Read More

Schedule for Dye and Drifter Releases

The schedule for RIVET dye and drifter releases have been tentatively schedule for: May 1, 2, 3, 4:  Drifter Release Experiments May 5 : Turnaround Instrument Day May 6,7,8 : Dye Release Experiments with Airborne Dye Observations May 9th:  Turnaround May 10,11, 12:   Dye Release Experiments with Airborne Dye Observations May 13th : Turnaround May 14, 15, 16, 17:  Drifter … Read More

WHOI (Raubenheimer/Elgar) & SIO (Feddersen/Guza) instrument plan (draft)

Below is a google earth image of the WHOI (Raubenheimer/Elgar) & SIO (Feddersen/Guza) sensor deployment plan.  We coordinated last week to get the best coverage from all of our sensors.   Steve Elgar made the nice map below.  It will change once we get the new survey after the dredging,  but this gives an idea of # of instruments and … Read More

drifters on NEARCOM model currents

In order to get an idea of the offshore extent of the tidal jet, exchange, and overall dispersion, Matt Spydell has taken the NEARCOM (tide+waves) model output provided by Tom Hsu, Fengyan Shi, and Jia-Lin Chen @ UDEL and released numerical drifters inside the inlet at the start of the ebb tide.  These drifters are advected by the currents and … Read More

NEARCOM tidal simulation results

In order to plan drifter and dye deployments as part of RIVET at new river inlet, we’ve been looking at model simulations from UDEL (Hsu et al. – NEARCOM),  U Miami (Reniers et al. – Delft3D) as part of the DRI, and also UNC (Leuttich et al. – ADCIRC) who have graciously given us some model simulation data.    We’ll be … Read More

RIVET Blog Site and RIVET coordinate system

The idea of this blog site is to have a place to put all the pre and post experiment ideas and analysis for the entire RIVET teams to share.   This should serve as a supplement to the dri-nr mailing list. WE’ll be posting pre experiment model simulation results soon. Also: don’t forget the RIVET coordinate system information can be found … Read More