Page 47: of Marine Technology Magazine (October 2019)

Ocean Observation: Gliders, Buoys & Sub-Surface Networks

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• Weed: The sensor was mounted on the bottom of the hull able to monitor the data live proved important: at one point, and caught weed. For the production model, a new moon pool one of the YSI wipers got stuck, and by re-running the wiper has been introduced, allowing the sensor to be mounted ver- routine on the ? y, the sensor cleared itself.

tically, with just the sensor cage and probes below the hull. • Graphical Results: Ben Wetherill with ACASAK Tech-

A copper mesh around the probe cage will slow fouling and nologies performed analysis on the data saved from the mis- prevent weed from entering the cage. sions, with some results included below. The following two • Communications: The cell coverage in DKP is excellent, maps show chlorophyll as captured in the ? rst two voyages. and the cellular network was an ideal solution. For the scien- The data showed consistently higher chlorophyll values in the tists, the mission was a ? rst step at using a moving sensor on shallower areas of the bays. Higher values are darker.

an unmanned vessel in a large, complicated embayment. The images above show chlorophyll and turbidity. Turbid- • Data: The YSI sensor and the SeaTrac ASV provided a ity correlates quite closely with chlorophyll, implying that the successful combination to collect water quality data. Being turbidity is probably caused by algae and not sediment. Also,

Eelgrass population (acres) in 1951, 2012 and 2014: note the drop from 3,440 to 987 acres.

The SeaTrac route around the DKP em- bayment, approximately 20 miles long.

Screenshot by SeaTrac

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