First day of drifter releases. Ebb and Flood

Today was the first day of the SIO (Feddersen/Guza) drifter releases.    We did 3 set of 2hr+ drifter releases with our 35 drifter fleet.    The first release began at about 0830 as the tide began to ebb.      We released the 35 drifters near channel marker 08 but in slightly different cross-channel positions – see the screenshot image below … Read More

RIVET from the air

Airborne operations are underway at RIVET. Below are some photographs of the inlet from the APL-UW test flight on Monday (17:00 – 18:00 local time). Onboard the Cessna 172, we have a dual-beam along-track interferometric synthetic aperture radar, two infrared cameras, and a visible wavelength camera. We will be posting imagery from these sensors as soon as it is available.

Sidescan Imagery

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: Follow the links to pre-deployement survey. … Read More

Example Merged Rectifications

Here are example merged Argus products that we will be putting on the web. If you have suggestions for changes, let us know. For example, we will add instrument locations as we learn them. The first is a large area time exposure showing the shoal configuration. The second in a small area snap that shows fierce crossing wave patterns.

Piling met station link

The met station on the piling at the N. Topsail Beach side of the inlet updates three times per day at , where you can see plots of recent observations and download the raw data.  The anemometer height is 5.4 m above MLLW.

Rapidly sinking.

For those sleeping safely away from the sea, here is the view from our deck.  Each high tide is a new adventure.

Initial Timex Images

Attached (with luck) are initial time exposure images from today at 1700 EST (1800 EDT??). We surveyed this evening and will be doing image geometries tomorrow then will run routine rectification maps thereafter. But we thought people might be interested in the shoal geometries.

Summary of RIVET target deployment locations

I was talking to Jesse McNinch this morning about compiling deployment locations for all the instruments that have been deployed.    Many deployed instruments don’t have yet an accurate processed GPS location.   However, target deployment locations have been put together by various PIs in coordination.   Jesse thought it would be useful to see the target locations.     So I’ve put together the  … Read More

Day 1 of SIO (Feddersen/Guza) deployments

Today was the first day of the SIO Feddersen/Guza deployments.   We installed all the pipes to mount Nortek Vectors, EcoTripplets, and marker poles at five locations denoted V1, V2, V3, V7, & V8.    For reference see the deployment map below.   The vector locations are labeled.     The idea is to be able to measure the dye dilution as dye is carried … Read More

Tidal elevation and currents: progressive or standing?

Inlet goons: We deployed a current meter for 24 hours near the mouth of the inlet, just offshore of the access road (where UW is building a condo complex out of pipes). The currents  are close to in-phase with the tides. High tide=strong  flood, low tide=strong ebb. Slack is 90-degrees out of phase relative to a sinusoid, and thus slack … Read More