5/19/2012 and 5/20/2012 Final Dye Release REMUS Ops

REMUS operations starting ~1.5 hours before max ebb were conducted during the 5/19 and 5/20 dye releases.  Conditions were rough during the 5/19 mission outside of the inlet and no dye was visible during REMUS ops.  However comparison plots of river Colored Dissolved Organic Matter (CDOM) versus Rhodamine concentrations show that the dye was present, just at low concentrations (~0.5 … Read More

Last SIO drifter releases: May 17

Sorry for the late post, but… Thursday May 17 was the last day of SIO drifter releases. Again weather (rain and potential T-storms) cut the releases short and we only did two releases. Both releases were during ebb tide and were generally similar (thus only the first is examined in detail here) but novel compared to previous releases during ebb … 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

Thermal IR visualized flow

The attached video shows a 17 minute series of 10 second averaged images from the thermal IR cameras on the APLUW/OSU tower.  Brighter shades indicate relatively warmer temperatures.  The high tide was approximately 2 hours prior to the movie.  Note the strong northward flow which bends into the inlet and intersects a cooler front in the main channel.

5/16/2012 and 5/17/2012 River Plume Extent Monitoring Missions

  Here are the results of two AUV missions performed on 5/16 and 5/17 to observe the offshore extent of the river plume during max ebb using elevated CDOM signatures to define the boundaries of  the plume.  The 5/16 mission was performed during strong southerly wind conditions (blowing directly into the inlet) while the 5/17 mission was performed during minimal … Read More

5/8/2012 Hyperspectral Image/REMUS overlay

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