Dataset: Hydroacoustic Survey Data 2020

Name: Echosounder data from goliath grouper aggregations in Jupiter, FL from August 31 until November 30, 2020.
Published: 2023-01-27
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.858599.1

Spatial Extent: N:26.98223177 E:-80.0048 S:26.95842445 W:-80.03035344

Temporal Extent: 2020-08-30 - 2020-11-29

Project:

Collaborative Research: RAPID: Storm and tropical cyclone effects on the spawning activity, larval dispersal, and ecosystem impacts of an endangered marine predator (Storm effect on predator)

Principal Investigator:

Yannis Papastamatiou (Florida International University, FIU)

Contact:

Yannis Papastamatiou (Florida International University, FIU)

BCO-DMO Data Manager:

Karen Soenen (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-01-27

Restricted:

Validated:

Current State:

Final no updates expected

Echosounder data from goliath grouper aggregations in Jupiter, FL from August 31 until November 30, 2020.

Abstract:

Echosounder data from goliath grouper aggregations in Jupiter, FL from August 31 until November 30, 2020.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2023-01-27	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.858599.1	2023-01-27

Description

Data have been published “as is”. Final review by the data submitter was not received after it was imported into the BCO-DMO data system.

Methods & Sampling

Hydroacoustic surveys were conducted at three well known artificial reefs in Jupiter, Florida (approximately: 27N, 80W). Sites include MG111 Barge and Warriors Reef (referred to as “mg” in data files), Sun Mariner Tugboat (referred to as “sun” in data files), and the Wreck Train complex (Zion, Miss Jenny, and Esso Bonaire) (referred to as “wrt” in data files). Surveys consisted of 20 350m long evenly spaced (10m) parallel transects.

Two Simrad split-beam echosounders (ES38-10 and ES 120-7C) were towed at approximately 2.5m s-1 on a custom built towfish, approximately 12m behind the research vessel (7m center console). GPS position is referenced at the center of the research vessel, but the correction has not been applied to these data. The distance between echosounders and antenna is approximately 15.5m.

Data were collected in Continuous Wave (pulse duration: 0.256µs, sampling interval: 10Hz) and Frequency Modulation (pulse duration: 2.048µs, sampling interval: 10Hz) modes at 38kHz (FM: 35-45kHz) and 120kHz (FM: 90-170kHZ) between 31 August and November 29, 2020. Data from 31 August to 15 October were collected in CW, and data from 30 October to 29 November were collected in FM. Echosounders were calibrated using standard techniques described by Demer et al. (2015).

Surveys were conducted biweekly during peak new and full moon periods. Missing surveys are attributed to power supply malfunctions and periods of inclement weather.

Data Processing Description

Data were processed in Echoview 11.1.34 (Echoview Software Pty Ltd). Exported survey data were merged into four master survey files based on frequency (38/120kHZ) and collection mode (CW/FM). Files included are “cw38_2020_repos.csv”, “cw120_2020_repos.csv”, “fm38_2020_repos.csv”, and “fm120_2020_repos.csv”.

CW processing: Bottom and surface exclusion regions were first applied to remove bad data. Impulsive noise and background noise removal algorithms were then used to remove interference produced by the boat and electrical systems based on the techniques presented by Ryan et al. (2015) and De Robertis & Higginbottom (2007). The default Echoview settings were used. Impulse noise was evaluated based using three consecutive pings, and ten samples in the vertical domain. Data were removed if an adjacent region was >10dB greater or less than the reference region. Background noise was evaluated based on 20 consecutive pings, and five samples in the vertical domain. The maximum noise threshold was set to -125dB and the signal-to-noise ratio was set to 10.0. Those samples that did not mee the criteria were excluded. Data were then divided into 5m vertical by 5m horizontal cells and exported as .csv files.

FM processing: Bottom and surface exclusion regions were first applied to remove bad data. Data were then divided into 5m vertical by 5m horizontal cells. No further processing was completed.

Additional dataset description: Each row represents a 5m vertical x 5m horizontal cell along the transect. Individual cells can be identified by interval and layer. “_M” indicates mean for the respective variable. For example, “Time_M” is the mean time within interval “x”, and “Lat_M” is the mean latitude within interval “x”.

BCO-DMO processing notes:

merged all 4 datasets into 1 file
converted data to ISO_DateTime_UTC

Data Files

File
hydroacoustics_all.csv (Comma Separated Values (.csv), 82.13 MB) MD5:1ec495f8d4707806b23707f9a4ddddb8 Primary data file for dataset ID 858599

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-2006293
NSF Division of Ocean Sciences	OCE-2006295

Deployments

None available yet

Instruments

Simrad EK80 echo sounder

Supplied Name: Simrad EK80 Scientific Wideband Transceivers

Supplied Description:

Simrad EK80 Scientific Wideband Transceivers were used with Simrad ES38-10 and ES120-7C Splitbeam echosounders. Echosounders were calibrated using standard techniques described by Demer et al. (2015).

Instrument Type

Generic Name: Simrad EK80 echo sounder

Acronym: EK80

Generic Description:

A high precision scientific echo sounder, designed to simultaneously operate frequencies ranging from 10 to 500 kHz. EK80 is a modular echo sounder system, and can operate with a combination of split and single beam transducers facilitated by a built-in calibration application. This system was built in succession to the EK60 echo sounder.

Split-Beam Echosounder

Supplied Name: Simrad ES38-10 and ES120-7C Splitbeam echosounders

Supplied Description:

Simrad ES38-10 and ES120-7C Splitbeam echosounders. Echosounders were calibrated using standard techniques described by Demer et al. (2015).

Instrument Type

Generic Name: Split-Beam Echosounder

Acronym: Splitbeam Echosounder

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

Generic Description:

"The split-beam echosounder has a transducer which is divided into four quadrants.The target direction is determined by comparing the signals received by each quadrant... The transmission pulse is applied to the whole transducer but the signals received by each quadrant are processed separately...The target strength is estimated from the transducer sensitivity in the relevant direction, namely the beam pattern and the on-axis sensitivity." From "Fisheries Acoustics: Theory and Practice" by E. John Simmonds, D. N. MacLennan, Wiley-Blackwell; 2 edition.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Collection_Mode	Continuous Wave (pulse duration: 0.256µs, sampling interval: 10Hz) and Frequency Modulation (pulse duration: 2.048µs, sampling interval: 10Hz)	unitless	sample_descrip
Frequency	Frequency mode: 38kHz (FM: 35-45kHz) and 120kHz (FM: 90-170kHZ)	kHz	sample_descrip
Interval	Represents a 5m wide column along transect	unitless	sample_descrip
Layer	Represents a 5m high layer in the water column	unitless	sample_descrip
Sv_mean	Mean Volume Back Scattering Strength	dB re 1m-1	Acc_bksctr
NASC	Nautical Area Scattering Coefficient	m2 nmi-2	Acc_bksctr
Depth_mean	Depth of 5m x 5m cel	meters (m)	depth
Date_M	Date of surv Format: %Y%m%d	unitless	date
Time_M	24hr format, UTC Format: %H:%M:%S.%f	unitless	time
Lat_M	Mean latitude within a cell	decimal degrees	lat
Lon_M	Mean longitude within a cell	decimal degrees	lon
Beam_volume_sum	Volume of cell determined by echosounder opening angle and depth	meters (m)	volume
Source	Survey ID provides site code, date, and survey period (day/night)	unitless	sample_descrip
ISO_DateTime_UTC	description Format: %Y-%m-%dT%H:%M:%S.%fZ	units	ISO_DateTime_UTC

Database

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Dataset: Hydroacoustic Survey Data 2020