NOAA Protocols for Fisheries Acoustics Surveys and Related ...

More documents

Recommendations

Info

An electronic ‘event log’ can be developed based on the SCS system. The event log is a data management tool for relating echo sounder data with scientific operations. When operational, the event log is routinely completed throughout each cruise to document chronological events of the acoustic sampling, deployments, and other operational details that are important for data processing and management. The event log can be used to register the start and stop of transects, gear deployments, sites and transect series and associated data such as date-time stamps, geographic location, EK500 vessel logs, and comments during survey operations. Techniques Event Log SCS data Error Uncertainty in temperature and salinity affect sound speed calculations, which affect all acoustical measurements. Temperature and salinity sensors must be calibrated to ensure high quality oceanographic measurements. Errors in logging and recording events will reduce the accuracy of survey estimates because acoustical data will be improperly related to transects or deployments. While the information is redundantly entered on a hard copy version of the event log, every effort must be insured to accurately enter information in the electronic event log. Considerations Remediation If temperature and salinity measurements are found to be in error, corrections to the oceanographic data should be implemented and new sound speeds calculated. If a significant change in sound speed is found, acoustical data should be reanalyzed. If errors in the event logging software or SCS data are observed during the survey, contact the electronics technician on board to rectify the problem. Improvements Acoustical data are continuous in two dimensions (vertical and along the ship track). CTD profiles provide vertical measurements at a single point along the cruise track and surface sensors provide one-dimensional measurements along the cruise track. Interpolation and extrapolation of these data are necessary to match the physical environment to the acoustical data. An improvement would be having the ability to collect two-dimensional temperature and salinity measurements. Data Management Data, post-processed data, and associated meta-data should be routinely archived during the survey. These data are downloaded to shore-based computers and permanently archived for each survey. In addition to data, post-processing and other software should be archived. 44
Modifications to Protocols Changes to operational protocols will be at the discretion of the appropriate Science Director who may approve such changes directly or specify a peer review process to further evaluate the justification and impacts of the proposed changes. We recommend that a national standing working group be established to coordinate development of national and regional protocols, to share information among the centers, and to improve the techniques of acoustical surveys. 45
Page 1: NOAA Protocols for Fisheries Acoust
Page 4 and 5: Echo Sounder Parameters ...........
Page 6 and 7: Trawls ............................
Page 9: Introduction In response to Vice Ad
Page 12 and 13: Advanced Survey Technologies Progra
Page 14 and 15: Techniques Before conducting a cali
Page 16 and 17: Considerations Remediation Echo sou
Page 18 and 19: transmission loss. To correct for s
Page 20 and 21: unavoidably discarded, just as some
Page 22 and 23: factors such as orientation are not
Page 24 and 25: A schedule for calibration and main
Page 26 and 27: Techniques Noise Acoustical A commo
Page 28 and 29: ⎛ I ⎞ r TS ≡ 10 log10 ⎜ ⎟
Page 30 and 31: Considerations Remediation If a TS-
Page 32 and 33: Techniques Beam Pattern Transducers
Page 34 and 35: during vertical migration, will cau
Page 36 and 37: A schedule for calibration and main
Page 38 and 39: degradation are external to the ech
Page 40 and 41: permanently archived for each surve
Page 42 and 43: Numerical Density to Biomass Densit
Page 46 and 47: References Demer, D.A., M.A. Soule,
Page 48 and 49: Regional Protocols Because of the d
Page 51 and 52: Table of Contents Introduction.....
Page 53: Electrical ........................
Page 56 and 57: Center Background NEFSC The Northea
Page 58 and 59: S v Calibrations The NEFSC acoustic
Page 60 and 61: Operation Menu/Transmit Power Norma
Page 62 and 63: Software The echo sounder firmware
Page 64 and 65: ii. Minimum Sv for good pick: -50.0
Page 66 and 67: Net mensuration sensors are attache
Page 68 and 69: We remove backscattering by surface
Page 70 and 71: GPS The primary Global Positioning
Page 72 and 73: Electrical Electrical noise protoco
Page 74 and 75: Scientific Computer System (SCS) Fi
Page 77: Appendix 2 March 11, 2005 NOAA Prot
Page 80 and 81: Techniques ........................
Page 82 and 83: Center Background AFSC The Alaska F
Page 84 and 85: On-axis sensitivity and S v calibra
Page 86 and 87: Volume Backscattering Measurements
Page 88 and 89: Mid-water juvenile pollock (max sa=
Page 90 and 91: Biological Sampling Mid-water and n
Page 92 and 93: Bubble Attenuation Vessel speed is
Page 94 and 95:
Data Collection Since 1990 to the p
Page 96 and 97:
sampling resolution of scattering l
Page 98 and 99:
A decision must be made as to wheth
Page 100 and 101:
design. If fish abundance in this a
Page 102 and 103:
Simrad. 2001. Simrad EK60 scientifi
Page 104 and 105:
104
Page 106 and 107:
Acoustic Data......................
Page 108 and 109:
ackscattering cross-section (σ i )
Page 110 and 111:
o For the 38 kHz transducer operati
Page 112 and 113:
• Two-way integrated beam pattern
Page 114 and 115:
Classification Techniques Single Fr
Page 116 and 117:
Performance Degradation Definition
Page 118 and 119:
Biological Data Data from catch pro
Page 120 and 121:
elation also assumes that backscatt
Page 122 and 123:
finer than the 13.5-18.9 nmi (25-35
Page 124 and 125:
Improvements - The annual hake migr
Page 126 and 127:
Techniques The primary source of th
Page 128 and 129:
Hamano, A., Sasakura, T., Kieser, R
show all

NOAA Protocols for Fisheries Acoustics Surveys and Related ...

Create successful ePaper yourself

Delete template?

Save as template?