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Seabed mounted acoustic doppler current profiler (ADCP) data

PRELIMINARY - SUBJECT TO REVISION

Northwest National Marine Renewable Energy Center
University of Washington Branch
Seattle, WA 98195

Contact: nnmrec@u.washington.edu
Website: http://depts.washington.edu/nnmrec

Survey Location: Admiralty Inlet, Puget Sound, WA

Equipment: Nortek AWAC 1000 KHz

QA/QC Protocol:
- reject ensembles during deployment or retrieval operations
- reject ensembles contaminated by surface reflection
Bad data are designated by "NaN".

Change Log:
- 6/27/10 (BLP) Initial release

Data are stored in MATLAB structures:
- time: time (GMT - 8:00)
- data: bins and velocity information
- anc: ancillary information about instrument and ba
- config: instrument configuration
- pres: free surface information
- QA: quality control notes

time.mtime: matlab serial time
time.vec: [year, month, day, hour, minute, second]

data.bins: midpoint of each bin relative to the seabed (m) - includes ADCP blanking distance and platform height
data.east_vel: eastward velocity (m/s)
data.north_vel: northward velocity (m/s)
data.vert_vel: vertical velocity (m/s)
data.mag_vel: velocity magnitude (vector sum of data.east_vel and data.north_vel) (m/s)
data.dir_vel: direction of velocity (deg true)
data.mag_signed_vel: signed (ebb/flood) velocity magnitude (m/s) 
*note: signed speed alogirithm produces garbage in sparse surface bins or if direction of ebb or flood is erratic*

anc.heading: ADCP heading (deg true)
anc.pitch: ADCP pitch (deg)
anc.roll: ADCP roll (deg)
anc.intens: backscatter amplitude (count) of beams 1-3
anc.intens_avg: average backscatter amplitude (count)
anc.bins: midpoint of each bin relative to the seabed (m) - ancillary bins includes all bins in ADCP range

config.BinSize: vertical bin size (m)
config.EnsInterval: interval between ensembles (seconds)
config.AvgInterval: interval over which ensemble is taken within config.EnsInterval
config.PerecntLoad: percentage load as a proportion of maximum ping rate for instrument
config.System: ADCP frequency and type
config.Latitude: latitude of deployment (decimal degrees)
config.Longitude: longitude of deployment (decimal degrees)
config.first_record: date and time of first ping
config.last_record: date and time of last ping
config.Uncertainty: Doppler uncertainty in each ensemble (m/s)

QA.operator: researcher performing QA on data
QA.date: date QA/QC performed (matlab serial time)
QA.corr_min: minimum correlation count for good data
QA.surface: source of free-surface elevation data

pres.surf: free surface elevation relative to seabed (internal sensor)
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