From Ad Reneirs & Patrick Rynne: All, We’ve posted the latest model predictions for NRI for the 28th-29th at the link below. Please click on the .zip file link in the center of the page. http://newriverinlet.com/Model_-_Results.html we are driving up today, predictions will be more timely in the days ahead once we get settled. cheers! -Patrick & Ad Below is … Read More
New NRI NEARCOM model results on the Apr 16/17 Bathy (Tom, Julie, & Fengyan)
The UDEL folks have posted new NEARCOM model results on their website. The basic conditions are the same. One M2 tidal cycle, with normally incident Hsig=1 m, and then varying the drag coefficient. It is hard to tell from these simulations how far offshore the tidal jet goes. We will be simulating drifter trajectories on these model currents and posting … Read More
Delft3D simulation on the new FRF bathymetry – first results (w. Rynne & Reniers) – updated
Today we have near gale force winds at New River Inlet. But there are model simulations to work up. As readers will recall, the FRF did a recent (Apr 16/17) bathymetry survey after the dredging of the main channel. The upshot is that the main channel is still very shallow and narrow. We have done two test dye releases (see … Read More
Delft3D dye simulations of New River Inlet (w. Ad Reniers & Patrick Rynne)
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 … Read More
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
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
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