| This site contains links to data sets from the SandyDuck nearshore two-dimensional array of Sonar altimeters (S), Pressure gages (P), bi-directional current meters (UV), and Thermistors (T, colocated with pressure sensors) deployed from near the shoreline to 5-m water depth along about 200 m of the coast during August-December 1997. |
The schematic below shows the sensor locations (and approximate water depths) in the Field Research Facility (FRF) coordinate system. |
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| A SPUVT frame near the shoreline at low tide. Mounted on the horizontal cross bars (from left to right) are an electronics package (yellow ring, 4 cables), a sonar altimeter, a Marsh McBirney electomagnetic current meter, and under water on the right hand side is a pressure gage. The cross bars are adjustable vertically to maintain the current meter about 50 cm over the evolving seafloor. Thirty-six frames were deployed in a two-dimensional array (see above). | A close up view (above, center) of a
SPUVT frame under water a few days after being deployed. The bio-fouled
cylindrical instrument on the left (with white cap on top and yellow ring) is a
pressure gage. The clean sensor to the right (also has a bright yellow ring,
with black 2 cm diamter sphere below) is an electromagnetic current meter.
Biofouling results in slow degradation of data from electromagnetic current
meters, requiring weekly cleaning and recalibration of offsets (shown on the
right). Scripps engineer Brian Woodward (above, right) has cleaned the electromagnetic current meter and is rotating it 180-degrees as part of the in-field recalibration process. All 40 current meters were cleaned and recalibrated approximately every 7-10 days to obtain mean currents with +/- 5 cm/s accuracy. (Photographs courtesy of W. Birkemeier, FRF.) |
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