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Summary Information for Field Activity 2007-031-FA

Area of Operations: Middle Ground, Vineyard Sound, Massachusetts, United States, North America, North Atlantic

Dates: August 10, 2007 to August 10, 2007

Chief scientist: Rich Signell

Objectives: Shipboard ADCP survey of ebb tidal currents over Middle Ground. We will attempt to document both the cross-bank structure of the tidal currents over 800 m long across-bank transects. We will also attempt to measure the detailed vertical current structure between two large sand waves (amplitude 2-4 m) over two wavelengths (~150 m).

Type of Activity: Shipboard ADCP survey;Shipboard ADCP survey

Information to be derived: Vertical structure of currents and backscatter intensity along shiptrack
Surface water temperature along shiptrack

Summary: We collected shipboard ADCP tidal currents over the ebb tidal cycle (flowing toward SW) on Middle Ground. We observed strong lateral shear in the tidal currents caused by Middle Ground and headlands along Martha's Vineyard. We used Teladyne/RDI WinRiver II software to collect the data, and this software produced two types of files for each of the 6 transects we conducted: (1) a binary file *.PD0 that contains raw information in beam/ship coordinates; (2) an ASCII file *_GPS.TXT which contains the DGPS navigation data. Barry Irwin also provided a RTK GPS navigation file at 1 s intervals after the cruise. RTK GPS data was not included in the data stream to the RDI WinRiver II software. Next time this should be included.

Contact: Rich Signell (

InfoBank: uses the identifier R-1-07-MA. Visit this site for more information.

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