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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: RDI Workhorse 300 KHz

QA/QC Protocol:
- reject ensembles during deployment or retrieval operations
- reject ensembles contaminated by surface reflection
- reject ensembles with average correlation counts < 60
Bad data are designated by "NaN".

Change Log:
- 6/3/09 (BLP) Initial release
- 7/17/09 (BLP) Updated to include QA/QC data
- 11/18/09 (BLP) Defined structure containing presssure information
- 12/18/09 (BLP) Update to reflect recent modifications to data structure

Data are stored in MATLAB structures:
- time: time (GMT - 8:00)
- data: bins and velocity information
- anc: ancillary information about instrument and signal quality
- 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.error_vel: velocity error as computed by ADCP from beam information
data.mag_signed_vel: signed (ebb/flood) velocity magnitude (m/s) *note: alogirithm produces garbage in sparse surface bins*

anc.heading: ADCP heading (deg true)
anc.pitch: ADCP pitch (deg)
anc.roll: ADCP roll (deg)
anc.intens: backscatter amplitude (count) of beams 1-4
anc.intens_avg: average backscatter amplitude (count)
anc.corr: beam correlation (count) of beams 1-4
anc.corr_avg: average beam correlation (count)
anc.PG1: percentage of good three beam ensembles
anc.PG2: percentage of ensembles rejected due to high velocity errors
anc.PG3: percentage of ensembles rejected for having fewer than three good beams
anc.PG4: percentage of good four beam ensembles
anc.bins: midpoint of each bin relative to the seabed (m) - ancillary bins includes all bins in ADCP range

config.SecPerPing: time between pings (seconds)
config.PingsPerEnsemble: number of pings per ensemble
config.BinSize: vertical bin size (m)
config.EnsInterval: interval between ensembles (seconds)
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
	- DST: StarOddi MicroDST
	- CTDO: SeaBird SeaBird 16+
	- HOBO: HOBO pressure logger
	- internal: internal ADCP pressure sensor
	- none: no free surface data appended

pres.surf: free surface elevation relative to seabed (interpolated to same time index as velocity measurements)
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