. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography T. A. Nelsen, D. A. Mayer, P. G. Hatcher & W. N. Hess Commencing on D-day, a continuous 3-day drogue study was carried out. One drogue each was deployed at depths of 7, 12 and 22 m on D-day. On D+2 a fourth drogue was added at 17 m. In the evening of D+3, a deep 32-m drogue was deployed and was followed for 3 days. The track of general drogue movement is shown in Figure i. Temperature Temperature data were taken at all particle sampling stations
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography T. A. Nelsen, D. A. Mayer, P. G. Hatcher & W. N. Hess Commencing on D-day, a continuous 3-day drogue study was carried out. One drogue each was deployed at depths of 7, 12 and 22 m on D-day. On D+2 a fourth drogue was added at 17 m. In the evening of D+3, a deep 32-m drogue was deployed and was followed for 3 days. The track of general drogue movement is shown in Figure i. Temperature Temperature data were taken at all particle sampling stations and at each sample depth. A laboratory thermometer was immersed into each sample immediately upon its arrival on deck and temperatures read to the nearest o-i °C. Surface. 292 42°25'N 42°I5'N 70M5'W 70-35'W Figure 2. Salinity data (%„) taken on Days ' D + 2' and ' D + 3' in Massachusetts Bay by Manohar-Maharaj and Beardsley (1973). The proposed dredging site is shown by the stippled square. Salinity Salinity data were collected (Manohar-Maharaj & Beardsley, 1973) on days D+2 and D+3 in the same areas as the water samples for bead counts (Figure 2). Experimental results and discussion Drogue and current meter data The track of the 12-m drogue is shown in Figure 3 as well as the locations of all current meters. Figure 3 shows sequences of current vector fields for a selected subset of drogue observations. There are a total of 29 observations for the 12-m drogue as shown in Figure 3(d). Each drogue position and associated vector field shows the drogue position at the observed time in relation to past drogue positions. The current vector fields were constructed from data subjected to a 3-h low pass filter. Thus the raw data were smoothed such that fluctuations with periods of less than 3 h were rejected. The data were then resampled hourly. Raw data time intervals were 5 min for the photogeodynes and 10 min for the Aandaraa meters. 913. Please note that these images are e
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