Page 17 - Performance Verification Statement for the Chelsea UV Aquatracka Fluorometer

Ref. No. [UMCES]CBL 2013-014
ACT VS12-01
RESULTS of WAVE TANK TEST
Tests were conducted at Bedford Institute of Oceanography’s (BIO) Center for Offshore
Oil, Gas and Energy Research (COOGER) in their 32 m wave tank facility. This wave tank was
constructed at the BIO in collaboration between Fisheries and Oceans Canada (DFO) and the
U.S. Environmental Protection Agency (EPA) for controlled oil dispersion studies (Photo 3).
The wave tank is able to continually produce breaking waves at precise locations in the tank
(Photo 4) and is fully equipped to enable measurements of dispersed oil in the water column. The
tank is equipped with a flap-type wave maker that generates waves with periods varying from
about 0.5 to 1.5 seconds. On the opposite end of the tank, a series of inclined screens is in place
to absorb wave energy and minimize reflection.
Photo 3. Bedford Institute of Oceanography’s Wave Tank
Oil additions were performed by BIO research staff using established protocols. In brief,
oil was first added to two liters of the ambient bay water and mixed on a shaker plate for
approximately 15 minutes, with or without dispersant depending on the test. The oil slurry was
then poured slowly into the wave generating end of the tank (Photo 5 and 6) and allowed to be
mixed by wave motion. Oil concentrations become uniformly distributed throughout the tank
after approximately 30 minutes of mixing.
A summary of the test conditions and background water quality concentrations of the
seawater used during oil additions are provided in Table 2. Temperature and salinity conditions
were consistent over the test period and chlorophyll and CDOM levels were relatively low.
Table 2. Comparison of ancillary physical and water quality conditions for hydrocarbon sensor
verification tests conducted in the wave test tank at the Bedford Institute of Oceanography, Halifax, Nova
Scotia.
Site Temperature
(oC)
Salinity Chlorophyll
(µg/L)
CDOM Turbidity
(NTU)
BIO Wave
Tank
Min 8.3 14.5 0.1 0.61 0.3
Max 9.5 15.8 0.9 1.33 5.0
Mean 8.9 15.6 0.5 0.95 1.5
17