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:
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
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.
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
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