Current velocity data from a continuous survey using a towed ADCP in Altamaha Sound, Georgia, USA

Title:  Current velocity data from a continuous survey using a towed ADCP in Altamaha Sound, Georgia, USA

Author/Data Collector: Chunyan Li

Point of Contact, PI, Originator:  Chunyan Li (cli@lsu.edu)

Description:

These are velocity profile data from vessel towed ADCP obtained in the Sapelo Sound during a survey conducted on Sep. 13-15, 2000, which includes 16-hour stationary mooring measurements, a 16-hour continuous survey along a triangle (14 Sep, 06:21 14 Sep, 22:01 UTC), and overnight mooring for ~ 13 hours. The instrument was an RDI 600 KHz Workhorse ADCP.

The ADCP was mounted on a sled towed by the boat. The vertical bins were 0.5 m. The surveys were conducted at an average cruise speed of about 2.5–3 m/s except at the turns when the vessel had to slow down and during CTD casts when the vessel had to stop for a few minutes. A Seabird Electronic SBE 19 plus CTD was used. Note that only ADCP data are included in this dataset.

The data are averaged at about 30-second intervals, excluding bad data. The data presented here are in ASCII with the generic format provided by the RDI’s software WinRiver II output. There are three data files:

ALT00T.000

ALT00T.001

ALT00T.002

Here is an example of the data –

50     50     25     40      4      0      4

0 9 13 12 25 46 90     1     18    3.560   -2.580  304.440   26.860

-369.50  -131.20    -0.80    -0.10  -32768   -32768   -32768   -32768      9.22     9.08     9.19     9.09

121.98        31.10        41.03       114.87       121.98

   31.9893333   -81.0330833  -314.40  -146.20         91.8

69.8           1.8           7.3           0.0           0.0           0.0           0.0    0.0    0.0

28 cm BT counts 0.43  0.034

  1.48     23.08    254.157  -22.2   -6.3   13.3    2.5  161.0  170.0  167.0  169.0  100       0.04

  1.98     26.23    267.378  -26.2   -1.2   13.0    2.2  166.0  175.0  172.0  173.0  100       0.28

  2.48     28.51    271.809  -28.5    0.9   12.9    4.9  163.0  171.0  170.0  170.0  100       0.36

  2.98     32.63    279.347  -32.2    5.3   11.6    2.1  160.0  168.0  167.0  167.0  100       0.54

  3.48     32.65    266.840  -32.6   -1.8    9.7    1.7  157.0  166.0  164.0  164.0  100       0.35

  3.98     32.11    271.249  -32.1    0.7    7.7    0.3  155.0  164.0  162.0  162.0  100       0.39

  4.48     32.10    269.286  -32.1   -0.4    6.6    1.3  154.0  162.0  161.0  161.0  100       0.35

  4.98     30.31    268.299  -30.3   -0.9    5.2    2.4  152.0  160.0  158.0  159.0  100       0.31

  5.48     30.32    264.891  -30.2   -2.7    3.9    5.3  150.0  158.0  157.0  157.0  100       0.28

  5.98     30.73    255.873  -29.8   -7.5    3.4    0.1  148.0  155.0  155.0  155.0  100       0.10

  6.48     28.87    263.835  -28.7   -3.1    2.2    1.5  147.0  157.0  154.0  156.0  100       0.30

  6.98     25.12    264.289  -25.0   -2.5    1.5   -1.6  154.0  165.0  160.0  164.0   89       0.23

  7.48     27.16    260.676  -26.8   -4.4    1.8   -0.1  156.0  166.0  163.0  164.0   94       0.26

  7.98     28.57    265.986  -28.5   -2.0    1.0   -1.5  147.0  161.0  157.0  155.0   83       0.31

  8.48     25.42    257.276  -24.8   -5.6    1.2   -0.5  149.0  162.0  155.0  158.0   72       0.30

  8.98     19.80    278.130  -19.6    2.8    0.3    0.7  154.0  169.0  160.0  164.0   61       0.63

  9.48     14.44    257.600  -14.1   -3.1   -0.4    6.9  154.0  172.0  162.0  164.0   44 2147483647

  9.98     11.79    320.505   -7.5    9.1   -1.3   -2.2  146.0  163.0  153.0  154.0   33 2147483647

 10.48      8.79    348.179   -1.8    8.6   -0.2    8.0  130.0  142.0  135.0  137.0   22 2147483647

 10.98    -32768     -32768 -32768 -32768 -32768 -32768  110.0  125.0  116.0  121.0    0 2147483647

The ADCP data were used in Li (2013).

Acknowledgements

The data were collected on R/V Bluefin funded by NSF-LTER.

References

Li, C. (2013). Subtidal Water Flux through a Multi-inlet System: Observations Before and During a Cold Front Event and Numerical Experiments, Journal of Geophysical Research: Oceans, Vol. 118, 1–16, doi:10.1029/2012JC008109, 2013.