Daily Archives: September 7, 2017

APL-UW moored SWIFTs and sea spider deployments complete

Thursday was day two on the water for APL-UW. The dolphins couldn’t quite keep up with us on our easy early morning transit from Port San Luis to Point Sal. We deployed APL’s last two sea spiders south of Point Sal under somewhat clear skies, with a hefty marine layer visible farther offshore. On the way home we ran into several large foamy streaks near the headland.

Tomorrow we’ll run through drifter release and survey protocols to get ready for the beginning of the intensive operations period!

Spoondrift Wave Array Deployed

Yesterday, Wednesday 6th, our team deployed the complete Spoondrift wave array (18 moorings). We used a local charter out of Avila Beach, CA, and had excellent conditions, (practically no waves or wind), which made the work easy and efficient.  The array covers the region from just north of Avila beach (about 1 mile west of Diablo Canyon power plant), to about 10 miles south of Pt Sal. The header picture shows a Spotter in the water, west of Pt Sal.

The main instrumentation on the wave moorings are Spoondrift Spotters, solar-powered wave trackers that measure surface displacements and transmit wave data (see figure above on left, for scale). The Spotters are deployed using a lightweight inverse catenary mooring with two small secondary surface floats and weighted lines to minimize surface signature. We have updated the shared google sheet and map to reflect actual coordinates of the instruments.

Live updates from the Spotter array are available through the Inner Shelf Spotter Dashboard (see above figure). The Dashboard also includes model overlays (see above), bulk time series, and direct comparison between model and data (see figure below).

All model data currently on the site is based on a regional SWAN model with WaveWatch boundary conditions (our ‘FirstGuess’). We are currently porting real-time updates from a back-ray assimilation model to the site. These assimilation model data will also be available through the Dashboard next week (we will update when available).

Operational Forecasts for Pt. Sal — NOW LIVE

The experimental operational forecasts for Pt. Sal are now live on a web portal. 

http://www.oces.us/onr click on the tab “LATEST” to see the movies and bookmark for easy access on smartphones.

From this webpage you will be able to do the following:

  • Watch animations of a 2-day forecast (click on the “LATEST” tab)
  • Watch animations of the archived forecasts (click on the “HISTORY” tab)
  • Download individual 2-day forecasts netcdf file for both the ocean and the atmosphere (click on the “OCEAN” or “ATMOSPHERE” tab). Over the next week, we will post some MATLAB code to facilitate this process for those who want to make in situ comparison with acquired data).
  • A brief description of the experimental forecast setup is provided on the main page. More details will be posted on the DRI Modeling website 

A special thanks to the GT/UCSC/UCSD modeling team for their efforts.

Tech Support (during the operational phase)
Email: onr.operational.forecast@gmail.com
Phone: (404)-698-6060

Reference contacts:
Emanuele Di Lorenzo (GT, edl@gatech.edu)
Kevin Haas (GT, kevin.haas@ce.gatech.edu)
Tongtong Xu (GT, txu68@gatech.edu)
Chris Edwards (UCSC, cedwards@ucsc.edu)
Patrick Drake (UCSC, pdrake@ucsc.edu)
Kevin Haas (GT, kevin.haas@ce.gatech.edu)

APL-UW day 1 on the water: moored SWIFTs and a sea spider deployed

APL-UW got out on the water today after a trucking company delivered both the R/V Sounder (APL-UW) and the R/V Kalipi (OSU) to Port San Luis.

R/V Kalipi and R/V Sounder on the big rig.

Once underway, APL deployed a sea spider in 20 m off Oceano and then moored SWIFTs on either side of Pt Sal.  The Pt Sal positions are along the SIO lines.  The one south of Pt Sal felt close enough to reach out and touch the rocks.

The SWIFT data are available hourly from the following links: SWIFT 24 (south of Pt Sal) , SWIFT 25 (north of Pt Sal)

Or, just view on the SWIFT map and click on the icon for most recent wave height.

Turbulence data also available via telemetry– contact Jim T to learn how to work with the binary files.

SWIFT 25 moored near Pt Sal




A Day of Mooring Deployments Aboard the Oceanus

A full day of mooring deployments from R/V Oceanus! A beautiful day with a little fog in the morning, but lots of sunshine in the afternoon. Lots of sea life out here including seabirds lined up in long rows at the internal wave fronts, pelicans patrolling by, sea lions, a whale slapping its tail, and a BIG mola mola. Nice to see our Scripps friends give us a drive by early this morning. We waved at Falk and company. Below is a photo of our crowded navigation chart. It’s black with mooring marks! The photo of Johannes Becherer is with the new 3D GusT, ready to deploy on a lander. Watch out you turbulent patches! The other photos are all of mooring OC32N-T being deployed. Our Oceanus Martech Brandon D’Andrea is front and center, including guiding GusTs over the side. Undergraduate student Raelynn Heinitz is now a mooring deployment expert and cotter pin bender extraordinaire. Tonight we’ll get our towed,undulating platform wet and do some water column tows with it and the side-mounted ADCP. Tomorrow it’s off to install our part of the Vandenberg array.

–Jack Barth and Jim Lerczak and the Oceanus gang

(all photos by Jack Barth)

scripps oceanography uc san diego