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WinRiver

WinRiver. 1. Average data to a greater interval Use raw data Decreases errors and increases data quality. 2. Convert to ASCII format Files found at: http://users.coastal.ufl.edu/~arnoldo/eoc6934/ponce/adcp /. depth cell length (cm). Bottom track vel (east in cm/s).

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WinRiver

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  1. WinRiver

  2. 1. Average data to a greater interval Use raw data Decreases errors and increases data quality

  3. 2. Convert to ASCII format Files found at: http://users.coastal.ufl.edu/~arnoldo/eoc6934/ponce/adcp/

  4. depth cell length (cm) Bottom track vel (east in cm/s) time per ensemble (hundredths of s) Profiling mode # of depth cells Ensemble # # of ensembles in segment pitch roll ADCP depth blank after transmit (cm) corrected heading temperature Total elapsed time (s) # of pings per ensemble Bottom track vel (vertical in cm/s) Bottom track vel (error in cm/s) Total elapsed distance (m) Distance traveled north (m) Distance traveled east (m) Course made good (m) Bottom track vel (north in cm/s) Ship velocity north (cm/s) Ship velocity east (cm/s) Total distance traveled (m) # of bins to follow and units of measurement Velocity reference (BT, layer, none) and intensity units (dB or COUNTS) Intensity scale factor (dB/count) Sound absorption factor (in dB/m) Date and time Discharge Values Depth Reading (m) Water layer vel Lat & Lon % good Velocity Magnitude Velocity Direction East Component North Component Vertical Error Echo Intensity Discharge Bin depth

  5. 3. Depurate data with the following criteria (for Lily Springs): % good > 20% |error| < 10 cm/s

  6. 3. Depurate data with the following criteria (for other data): % good > 80% |error| < 10 cm/s discharge < 100 m3/s ship speed or bottom track speed > 0.15 m/s

  7. 4. Calibrate Compass Method of Joyce (1989, Journal of Atmospheric and Oceanic Technology, 6, 169-172) and Method of Pollard & Reid (1989) tan  =< ubtvsh - vbtush>/<ubtush + vbtvsh> 1 +  = [<ush2 + vsh2>/<ubt2+ vbt2>]1/2 ucorr = [1 + ][u cos - v sin ] vcorr = [1 + ][u sin  + v cos ] where ubt is the East component of the bottom track velocity ush is the East component of the navigation velocity (from GPS) u is the East component of the current velocity measured by the ADCP ucorr is the corrected East component of velocity < > indicates average throughout one transect repetition Carry out the correction for each transect repetition

  8. 5. Generate a regular matrix for u, v, and t corresponding to each transect repetition Identify each transect repetition according to the time of beginning and end of each repetition

  9. Draw each repetition placing the data (u, v, andt) on a regular grid (distance vs. depth) The origin of the matrix (zero distance) is arbitrary (e.g. a point at the coast) Calculate the distance from that origin to the location of each profile in order to generate the regular grid The end result is a group of Nregular grids, whereNis the number of transect repetitions. Each grid point has a time series ofNvalues foru,v, t, andbackscatter.

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