Baltic Sea Information about the Acoustic Soundscape (BIAS)

Transcription

1 Underwater noise workshop, ECS 6 April 2014 Baltic Sea Information about the Acoustic Soundscape (BIAS) Standards for measurements and signal processing

2 Participants in standards and signal processing work Peter Sigray, FOI, Sweden Leif Persson, FOI, Sweden Matthias Andersson, FOI, Sweden Jukka Pajala, SYKE, Finland Jaroslaw Tegowski, Gdansk Technical University Rainer Mantuchek, ITAP, Germany Klaus Betke, ITAP, Germany Jakob Tougaard, Aarhus University, Denmark Magnus Wahlberg, University of Southern Denmark Thomas Follegot, Quiet Oceans, France Ursula Verfuss, SMRU Limited

3 Project location: Baltic Sea Coordinator: Sweden Total Amount: EC Co-funding: 49,78 % Time-period: 1 September August 2016 Co-ordinator: Swedish Defence Research Agency (FOI) AB:s Denmark, Germany, Poland, Estonia, Lithuania and Finland

4 Regional implementation of the Marine Strategy Framework Directive Establish baseline for UW noise Develop analysis tools Regional data platform Uniform implementation of descriptor 11 in the Baltic

5 Requirements of the directive Indicator : Trends in the ambient noise level within the 1/3 octave bands 63 and 125 Hz (centre frequency) (re 1uΡa RMS; average noise level in these octave bands over a year) measured by observation stations and/or with the use of models if appropriate. Minimum: 2 numbers per year: average noise level in 63 Hz and 125 Hz 1/3 octave bands. Key questions on interpretation: Ambient noise, trends, average noise level and models More practical questions: Specifications of datalogger Deployment locations and methods Recording bandwidth, duty cycle etc. Signal processing Usefulness for other purposes TSG11 BIAS

6 Datalogger requirements in BIAS Hydrophone bandwidth 10Hz-12 khz (min) Clip level ~165 db re. 1 upa (16 bit system) Channels: 1 (minimum) Resolution 16 bit (minimum) Sampling rate 24 khz minimum. Min. 4 times oversampling, filtering and digital decimation. Recording format. Raw (pcm) or non-lossy compression of it Memory and battery capacity for 3 months recording at min. 33% duty cycle Affordable price!!

7 Two fulfilled criteria when project started SM2M Wildlife Acoustics DSG-OCEAN LoggerheadInstruments

8 Calibration/test Pistonphone sound source Microphone Coupler

9 Rig design Hydrophone 3 m above sea floor No surface marker Retrieval by acoustic release Sonardyne Teledyne Disposable anchor (>20 kg) Concrete tile Gravel bag Secondary uplift (total kg without anchor) DSG-Ocean SM2M

10 The complete rig SM2M-logger Secondary uplift Sonardyne acoustic release C-POD Disposable anchor

11 Rig design for trawl exposed sites Developed by FRUG, Poland Heavy, able to survive otter trawls Recovered by acoustic release of float

12 Positions 2 types of positions: Close to shipping lanes obtain source information Far from shipping lanes estimate propagation loss About 40 stations Deployment entire 2014 Service every 3 months

13 Analysis 63 Hz, 125 Hz + X Hz 1/3 octave levels SPL Modelling Frequency statistics Amplitude statistics Other measures

14 Attenuation (db) FFT-filter bank Frequency (Hz) Very close to ANSI/ISO standard for 1/3-octave band Much faster than time-domain filtering

15 10k 1k

16 time (min) s 20 s 5 min s 20 s 5 min

17 Modelling 63 Hz 1/3 octave band levels Based on AIS-data. No actual recordings yet. Performed by Quiet Oceans/Thomas Follegot

18 Modelling 125 Hz 1/3 octave band levels Based on AIS-data. No actual recordings yet. Performed by Quiet Oceans/Thomas Follegot

19 Underwater noise workshop, ECS 6 April 2014 Questions and comments?