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ADCP_s


12m Node ADCP summary data

1200 kHz Workhorse Monitor measuring 25 bins, 50 cm apart, from 3.21 meters above bottom through the surface.

The velocities are used to produce current, depth and wave parameters.

Here is the list of field names:

Field name Description Units
Year The year the data were collected n/a
Yday Decimal year day (start time of sampling) UTC, January 1 at 00:00 is 1.0
MO The month the data was collected UTC
DA The day the data were collected UTC
HH The hour the data were collected UTC
MM The minute the data were collected UTC
SS The second the data were collected UTC
lrec_adcp Total number of records collected during averaging period n/a
yday_adcp Year day from ADCP (drifts) 0.5 = Jan 1 GMT
press_adcp_mean mean pressure above 2.1 mab cm
temp_adcp_mean mean water temperature at 2.1 mab Deg C
press_adcp_m50 median pressure above 2.1 mab cm
temp_adcp_m50 median water temperature at 2.1 mab Deg C
press_adcp_std std dev of detrended pressure cm
temp_adcp_std std dev of detrended water temperature Deg C
press_adcp_length number of records passing filter (9m < p < 12m) with outliers removed n/a
temp_adcp_length number of records passing filter (-25 < t < 35) with outliers removed n/a
nshort_adcp from unpacker - nbadChksum n/a
nmissing_adcp from unpacker - nbadSizeRecs n/a
pbad1 beam1: percent bad in removing outliers (3.5*std from mean) n/a
pbad2 beam2: percent bad in removing outliers (") n/a
pbad3 beam3: percent bad in removing outliers (") n/a
pbad4 beam4: percent bad in removing outliers (") n/a
wave_height_pressure 4*sqrt(sum(Snn).*dF) (f > 0.05) Snn from pressure cm
wave_period_pressure sum(Snn)./sum(Snn.*f) seconds
wave_height_all 4*sqrt(sum(Snn).*dF) (f > 0.05) Snn from surface velocity cm
wave_height_swell 4*sqrt(sum(Snn).*dF) (0.05 < f < 0.15 Hz, 20 -> 6.7 Seconds)
Snn from surface
cm
wave_height_windwave 4*sqrt(sum(Snn).*dF) (f > 0.15, > 6.7 seconds) Snn from surface cm
wave_period_all sum(Snn)./sum(Snn.*f) from surface velocity (f > 0.05) seconds
wave_period_swell sum(Snn)./sum(Snn.*f) from surface velocity (0.05 < f < 0.15Hz)) seconds
wave_period_windwave sum(Snn)./sum(Snn.*f) from surface velocity (0.15 < f < 0.25) seconds
wave_direction_all wve direction from bottom PUV (f > 0.05) degrees from Ntrue
wave_direction_swell wave direction from bottom PUV (0.05 < f < 0.15Hz)) degrees from Ntrue
wave_direction_windwave wave direction from bottom PUV (0.15 < f < 0.25) degrees from Ntrue
Urms_bottom bottom orbital velocity cm/s
pitch pitch degrees
roll roll degrees
heading heading* degrees
z0 height above bottom at first bin cm
dz distance between bins cm
vel_1_East_mean Eastward component of velocity at bin 1 cm/s
vel_1_North_mean Northward component of velocity at bin 1 cm/s
sigstren_1_mean mean signal strength at bin 1 dB
sigstren_1_std std dev of detrended signal strength at bin 1 dB
sigcor_1_mean mean correlation coef (cc*100/255) n/a
vel_2_East_mean
vel_2_North_mean
sigstren_2_mean
sigstren_2_std
sigcor_2_mean
Parameters vel_N_East, vel_N_North, sigstren_N, and sigcor_N repeat through N=25.
Snn_1 estimate of surface spectra (Snn) for each freq bin** cm^2/s^2
Snn_2 Snn estimated from bin 2
Continuing through each frequency bin to Snn_30
Directn_1 Estimate of direction for each frequency bin degrees from Ntrue
Continuing through each frequency bin, N=30
* hard-coded heading in translation to geographic coordinates, ie, recorded heading is not used in processing
** f(1) = 0.03125, df = 1/64, f(30)=0.4844


SN 1654


Cleaned ADCP faces 10/29/04
Cleaned ADCP faces 12/16/04
Cleaned ADCP faces 5/12/05

Turn-around 8/05

Cleaned ADCP faces 11/12/05
Cleaned ADCP faces 3/7/06
Cleaned ADCP faces 4/19/06

Turn-around 8/06

Turn-around 9/07

Cleaned transducer faces in Jan 29,2008

Found ADCP faces heavily fouled and cleaned again: 25 April, 2008

Node recovered: May 2, 2008 - cleaned up and redeployed May 24

ADCP faces cleaned: October 15, 2008

ADCP CorMag algorithm changed Nov, 2008

ADCP faces cleaned: March 21, 2009

ADCP faces cleaned: May 12, 2009

ADCP faces cleaned: July 14, 2009


NEW ADCP: SN 10295 deployed 9/1/09
But WA/WE error velocity and false target thresholds
set too stringently for single ping mode
Fixed problem 9/10/09

ADCP faces cleaned: October 15, 2009


Node turn-around 10/11/2010 - old ADCP (SN 1654) but newly refurbished
new firmware; new transducers; new Serial Number: 14391


Node Turn-around 6/6/2011 - SN 10295

ADCP failed (bad cable) 10/13/2011

New ADCP installed 10/24/11 (SN 1654/14391)


New ADCP installed 08/09/2012 (SN 10295) with Node turn-around with transformer
NOTE: This had troubles but we had replaced the end-cap connector
BUT: We Observed TROUBLEs with orientation and shape of tidal ellipse.

SO: We recovered and replaced SN 10295 with ADCP SN 14391 (Sep 14, 2012) but the cable didn't work. So on October 8, we replaced cable and started collecting data.

NOTE: for SN 14391 11/7/2012 changed WE from 2000 to 5000 (Vertical velocity error for single ping data). on 11/8/2012 changed WA from 50 to 255 (higher false target). This now matches SN 10295 and produces fewer flagged bad records. (See Pbad1-4 in ADCP_s data.)


New ADCP installed 07/17/2013 (SN 10295) with Node turn-around with transformer
NOTE: This has new transducers and processing boards
Until July 30th, the system was configured incorrectly and data were processed into world coordinates, when they were already in world coordinate systems. Could be reprocessed to get good currents - but wave data are not retrievable for those 13 days. Now we are set up correctly, but data are noisey (cable issues?)

NOTE: interference by buoy in beams from another co-located science project led to bad data from 8/1 - 8/6/13

9/4/2014 - node turn-around installed SN 14391


Last updated: November 2014