Dataset: ADV_field

Name: Current velocity measurements taken from the collection sites at the surface using a Vectrino Acoustic Doppler Velocimeter from the Friday Harbor dock and laboratory in 2012 (Jellyfish predation in turbulence project)
Published: 2016-07-06
Keywords: oceans

Cite This Dataset

Project:

Influence of organism-scale turbulence on the predatory impacts of a suite of cnidarian medusae (jellyfish predation in turbulence)

Principal Investigator:

Kelly Rakow Sutherland (University of Oregon, OIMB)

Guest:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version Date:

2016-07-06

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Current velocity measurements taken from the collection sites at the surface using a Vectrino Acoustic Doppler Velocimeter from the Friday Harbor dock and laboratory in 2012 (Jellyfish predation in turbulence project)

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Description

Related Dataset:
Tank and field turbulence

Methods & Sampling

Current velocity measurements were taken from the collection site at the surface using a Vectrino Acoustic Doppler Velocimeter (ADV; Nortek, Oslo, Norway), at depth between 0.5 and 5 m using in situ PIV (Katija and Dabiri, 2008). The ADV measurements were collected at a sampling rate of 100 Hz over 1-5 min intervals.

Data Processing Description

The TKE dissipation rate at the surface was calculated from the ADV-produced velocities in the horizontal, x, direction, u, following (Sanford, 1997) Epsilon(ADV)=(urms)3/ZK where Z is the total water column depth (14 m) and κ is von Karman’s constant (0.4).

BCO-DMO Processing:

- added conventional header with dataset name, PI name, version date
- renamed parameters to BCO-DMO and BODC standards
- replaced blanks with 'nd', no data
- replaced '# to #' with '#-#'
- split date and time into separate columns
- added 'sampling rate' column
- reduced digits to right of decimal from 13 to 2

Data Files

File
ADV_field.csv (Comma Separated Values (.csv), 3.77 KB) MD5:5acd113e299312489ab4711cb164a3e3 Primary data file for dataset ID 649913

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1155084

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
FHL_Sutherland		2012-06-01	Friday_Harbor		data info

Instruments

Acoustic Doppler Velocimeter

Supplied Name:

Supplied Description:

ADV; Nortek, Oslo, Norway

Instrument Type

Generic Name: Acoustic Doppler Velocimeter

Acronym: ADV

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/384/

Generic Description:

ADV is the acronym for acoustic doppler velocimeter. The ADV is a remote-sensing, three-dimensional velocity sensor. Its operation is based on the Doppler shift effect. The sensor can be deployed either as a moored instrument or attached to a still structure near the seabed.

Reference:
G. Voulgaris and J. H. Trowbridge, 1998. Evaluation of the Acoustic Doppler Velocimeter (ADV) for Turbulence Measurements. J. Atmos. Oceanic Technol., 15, 272–289. doi: http://dx.doi.org/10.1175/1520-0426(1998)015<0272:EOTADV>2.0.CO;2

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
year	year	unitless	year
filename	file name	unitless	no_bcodmo_term
date	date of measurements in field; formatted as yyyy-mm-dd	unitless	date
time_start	time of first measurement; formatted as HH:MM	unitless	time_start
time_end	time of last measurement; formatted as HH:MM	unitless	time_end
sample_rate	sampling rate	Hz	no_bcodmo_term
totl_measure	total number of measurements	unitless	count
time_tot_sec	total time in seconds	seconds	time_elapsed
time_tot_min	total time in minutes	minutes	time_elapsed
time_increment_min	time increments	minutes	no_bcodmo_term
meas_interval	observation interval range	measurements	no_bcodmo_term
flow	Flow speed estimated as speed = sqrt(rmsU^2 + rmsV^2 + rmsW^2); (Finelli et al. 2009 p 463 used (sqrt (u2 + v2 + w2 )	cm/sec	flow
mean_u	mean horizontal velocity 1	cm/sec	curr_east
mean_v	mean horizontal velocity 2	cm/sec	curr_north
mean_w	mean vertical velocity	cm/sec	no_bcodmo_term
u_rms	root mean square of u	cm/sec	curr_east
v_rms	root mean square of v	cm/sec	curr_north
w_rms	root mean square of w	cm/sec	no_bcodmo_term
current_avg	average current	cm/sec	no_bcodmo_term
TKE	turbulent kinetic energy: 0.5(ave_u_prime_sq+% ....) ; where u_prime is instantaneous deviations from the mean velocity (e.g. Finelli et al 2009) and the instantaneous values are averaged over time.	m^2/s^2	no_bcodmo_term
dissip_rate	dissipation rate of the surface field: E = rmsV^3/depth*0.4 (Sanford 1997 p. 273; 0.4 is von Karman's constant); used V because it is usually the largest rms component.	m^2/s^3	no_bcodmo_term
L_k_cm	kinematic viscosity at 11.5 deg C and 35 ppt is 1.3 x 10-6 m2 s-1	cm	no_bcodmo_term
Taylor_microscale_cm	turbulence length scale is a length scale used to characterize a turbulent fluid flow: λ= sqrt(15vurms2/ε)	cm	no_bcodmo_term
Re	Reynolds number	unitless	no_bcodmo_term

Status message

Database

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Dataset: ADV_field