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Rip currents @Guadalupe

Graduate students Alex and Spencer have been capturing drone footage of rip currents along the beach by our radar site and comparing optical versus radar observations. Above left is a snapshot of one. Rip neck and rip head are evident by their entrained sediment. Rip head is particularly interesting  with its intermediate scale wave breaking and smaller scale instabilities along the outer edge. Sped up version of the movie (8x) can be viewed here. Above right, the GEarth radar overlay on the right pins the drone location just off the beach from our radar site. The green dots note the southeastern corner of the OSU Oceano array. The scale of these rips may seem a bit small (200-300 m cross-shore) compared to the cross-shelf distances you all have been covering with your ship ops, but don’t count them out yet!

You can check out a radar movie of the rip here, or on YouTube here. In the movie you can see at least a half dozen rip currents, even cooler, at 1541PDT on Sept. 11 you can clearly see a set of solitons crashing into the surf zone and into the rip currents. Afterwords there are interesting cross-shore dark features that we suspect are slicks of some sort.

  

Fighter pilots at the beach.

Info about live radar feed

Just a little info about the live radar feed, the feed can be found on the ISDRI blog under ObservationalData/Realtime Data or at this link, some instructions are located at the blog RealtimeData as well. This feed can be accessed from your phone, if you download the single image you can even view it in Google Earth on your phone and see the blue dot of where you are located in the image. The files are not large, we were able to use the realtime single image from our phones on the beach. Also, if you click the “KMZ archive link” you can see the last 1hr/3hr/6hr/12hr/24hr/48hr kmz sequences and slide through in time on GEarth. These files are ~15MB (48hr file is 40MB). Any questions, just let us know.

IW observed today (GRP radar)

Long IW observed afternoon June 7 off Guadalupe

This afternoon we observed a fairly long (in the alongshore direction) internal wave packet propagating onshore all afternoon. It can be seen just east of the orangish contour (depth not obvious from kml info). It became visible in our field of view around 230pm, the above image is from 6pm. Note the vertical yellow line for scale (10km). For those interested in watching propagation, this can be seen via archived data on our real-time site (http://research.engr.oregonstate.edu/haller/innershelf/guadalupe-kmz.php).

scripps oceanography uc san diego