We’ve been busy processing up the RIVET I data from the New River Inlet, which we will be posting to our ftp site soon. We’ve also been working up the airborne observations (in collaboration with Luc Lenain & the Melville lab). The video below shows a visualization of the May 7th dye release. Animation of repeated airborne passes of the … Read More
Sonar Imagery of bedform movies
Here are the movies from the sonars on our quadpods. I added two new ones with 2-axis pencil beam rotary sonar imagery overlaid on top of the sidescan data to show some actual elevations of the bedforms in a limited region under the frame. https://vimeo.com/album/1988223 And here are the locations of the frames and some boat mounted sidescan:
The waves at New River Inlet are supposed to be below 50 cm later this week. I looked at the waves at the buoy every morning since February. They were bigger the 4 weeks the RIVET sensors were in the water than at any time since February! There were two pre-June tropical storms. When a few of us came to … Read More
SWIFT runs complete
Yesterday we completed the final set of SWIFT runs, measuring surface turbulence, waves, winds, and currents through the inlet. Below is the composite of all tracks from 26 Apr to 21 May, color scaled by turbulent dissipation rate. Across all conditions, there is consistent enhanced dissipation at the channel outlets (old and new), as well as over the shoals. Other, … Read More
Dye release Sat May 19th: Balancing Dye Flux
The dye release on Sat 19 May was interesting. 30 gallons of dye were released for 5 hours starting at 0430 (AM!) in approximately 10 m water depth a few meters (3-4 m) above the bed between buoy #6 and #8 in the channel Dye went up the inlet towards the ICW on the flood. Dye that had reached … Read More
Bedforms in deeper water / channels
Since there has been a bit of discussion about bedforms recently I thought would post a kmz of sidescan imagery from May 5th. This survey started at the end of flood tide and the bedforms in the dredged channel were asymmetrical in flood oriented direction, by the end of the survey, 2 hrs later at the beginning off ebb tide flow, they had reversed asymmetry to … Read More
re: Dye Release on May 11th – bomb release near Inter-Coastal Waterway
Here is another aerial image to complement those posted earlier by Falk. This photograph shows some very cool eddies, and it is also a great illustration of how thin the surface layer of dye was to the SW of inlet. The dye-free streak on the right side of the photograph was left in the path of our dye sampling WaveRunner.
REMUS-100 Ebb Tide ADCP Survey, May 4th
Posting on behalf of Rocky Geyer: These are near-surface velocity vectors from the WHOI REMUS at max ebb on May 4th in the north channel. Maximum ebb currents are well over 1 m/s. Lots of bathymetric steering, but some interesting free lateral shear zones as well.
Traykovski WHOI Quadpod deployment
Yesterday (May 2nd) we deployed two quadpods in the old and new channel (near the outer most red can channel marker #4) at the locations in the linked kml These are 7′ tall frames that have the upper ~2 exposed at low tide and are submerged by ~2′ at high tide. They have various downward aimed sensors to measure flow, … Read More
Sidescan Imagery
In preparation for our quadpod deployement I conducted a quick sidescan survey of the old channel out my pod1 site and the new channel out to my pod2 site. Here is one spot in the newly dredged channel near WHOI (Elgar&Raubenhiemer’s) site 07. KMZ’s with the complete data set can be downloaded here: https://docs.google.com/open?id=0B-O7NMkrpqL6MS1mYy1xY0lGRU0 Follow the links to pre-deployement survey. … Read More
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