Hello everyone, just wanted to pass along some of the work the SIO CORDC group has been performing offshore with the REMUS AUV. On 5/8/2012 we ran a REMUS mission supporting the Guza dye release. We’ve overlaid the Rhodamine signature observed by our AUV on the hyperspectral image taken at 17:39UTC (courtesy of Luc Lenain and Nick Statom). The REMUS … Read More
6th day of drifter releases
May 15 was the 6th day of drifter releases. We did 2 releases in the morning during the ebb tide, 1 during ebb to slack tide, and 1 afternoon release during flood tide. The releases today were shorter in length so that we could collect all 35 drifters more quickly if thunderstorms arrived, which thankfully they didn’t. Below are images … 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
West side bed forms
Below is a movie made by Cassia Pianca showing changes in low-tide morphology during the experiment. Focus on the short-scale features right along the shoreline – you will see them steadily move toward the inlet at a rate of about 50 m in 8 days (6 m/day). Hmm. If this doesn’t show up in the blog, I’ll email it. movieSmallLowTide … 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.
Inlet Currents??
Today I tried initial analyses on “vBar” pixel instruments to measure tidal currents in the inlet. These are based on Chris Chickadel’s work and seemed potentially applicable to this situation of co-aligned waves and currents in the inlet. Below shows the locations of estimates. The figure below shows ebb current estimates for each of the three lines. Locations of zero … Read More
Dye Release on May 11th – bomb release near Inter-Coastal Waterway
Today (Sunday May 13th) is instrument turnaround day and general catching up. We also have a report on the dye-bomb release we did on May 11th. In short, it was an amazing dye of observing the ocean. The RIVET community had many assets in the water measuring dye, currents, temperature, and salinity. Here we’ll focus on a … Read More
from the “Maple” group BIO/Dalhousie/UMaine
The ‘Maple’ group from BIO, Dalhousie and UMaine arrived Tuesday. Our objective is to characterize suspended particles (size distribution and composition) and relate it to ocean color. We have already scouted the river, taken grab samples and water samples for grain size, and have completed a drift station with a LISST and Digital Floc Camera through the mouth of the inlet. In the … Read More
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.
SWIFT drifter results to date
Here is a composite image from 12 days of SWIFT drifter runs through the inlet spanning many different tide/wind/wave conditions. The color scale is the surface turbulence dissipation rate, which is generally correlated with strong wave-current interactions in the two channels. Preliminary turbulence metrics and bulk wind, wave, and current values are posted for each day at http://herschel.apl.washington.edu/darla/SWIFT/, along with an … Read More