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Correlation between underwater noise level and AIS data in the Gulf of Catania (Sicily) Sara Pulvirenti spulvirenti@lns.infn.it Erice International School.

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Presentation on theme: "Correlation between underwater noise level and AIS data in the Gulf of Catania (Sicily) Sara Pulvirenti spulvirenti@lns.infn.it Erice International School."— Presentation transcript:

1 Correlation between underwater noise level and AIS data in the Gulf of Catania (Sicily)
Sara Pulvirenti Erice International School of Ethology CETACEAN ECOLOCATION – OUTER SPACE NEUTRINOS Erice, Sicily (Italy) – October , 2013

2 INGV geophysical sensors
Titolo Argomento SN1-EMSO and EMSO - SMO The SMO acoustic antenna works in synergy with smaller-size detectors that have been placed in the LNS submarine site offshore Catania, in the framework of the EU project EMSO (see Francesco Simeone and Paolo Favali presentations). Installed at 2100 m depth INGV SN1-EMSO 4 SMID hydrophones (96 kHz/24bit) + INGV geophysical sensors CATANIA 5 km LNS Test Site Laboratory at the port of Catania 20 km 5 km POWER FRAME INFN - LNS EMSO - SMO 4 SMID hydrophones (192 kHz/24 bit) Installed at 2100 m See at Erice, 18/10/2013 1 Sara Pulvirenti

3 Seismic SMID Hydrophone DT-405D(V)1
Sensitivity curves: High Gain Channel + 60 dB Low Gain + 30 dB Sampling frequency of 2 kHz Hydrophone Dimensions 89x150 nm Sara Pulvirenti Erice, 18/10/2013 2

4 Acoustic data – Statistical analysis in 1/3 octave bands
Available data Set: 2012/06 – 2013/05. Analysed data set: 2012/09 – 2013/02 Continuous recordings divided in files of 10 minutes. Average power spectral density (Nfft =2^14) calculated for each file - 1/3 octave bands. PRELIMINARY YIELDS 26050 Recordings (10’) Sara Pulvirenti Erice, 18/10/2013 3

5 Acoustic data – Statistical analysis in 1/3 octave bands
Available data Set: 2012/06 – 2013/05. Analysed data set: 2012/09 – 2013/02 Continuous recordings divided in files of 10 minutes. Average power spectral density (Nfft =2^14) calculated for each file - 1/3 octave bands. PRELIMINARY YIELDS 26050 Recordings (10’) Sara Pulvirenti Erice, 18/10/2013 3

6 Acoustic data – Statistical analysis in 1/3 octave bands
1/3 Octave Bande From 44.7 to 56.2 Hz 1/3 Octave Bande From 56.2 to 70.8 Hz 1/3 Octave Bande From 70.8 to 89.1 Hz 1/3 Octave Bande From 89.1 to 112 Hz 1/3 Octave Bande From 112 to 141 Hz 1/3 Octave Bande From 141 to 178 Hz Sara Pulvirenti Erice, 18/10/2013 4

7 Ambient sound pressure level in 1/3 octave bands
Comparing our dataset to litterature, SN1 measurements have been compared with the Wenz curves related to traffic noise. (Knudsen et al., 1948; Wenz, 1962; reviewed in. Urik, 1983) Legend: 5th percentile 25th percentile Median 75th percentile 95th percentile PRELIMINARY HEAVY SHIPPING TRAFFIC MEDIUM SHIPPING TRAFFIC LOW SHIPPING TRAFFIC WIND SPEED - 5 KNOTS WIND SPEED - 10 KNOTS Sara Pulvirenti Erice, 18/10/2013 5

8 AIS data acquisition at LNS laboratory
The Automatic Identification System (AIS) is an automatic tracking system used by ships for identify and locate vessels. It gives information such as position, mmsi, speed. INFN – LNS CATANIA Displaying data in real time on Google map web page INGV DATABASE LNS STORAGE Off – line analysis Sara Pulvirenti Erice, 18/10/2013 6

9 AIS statistical analysis
MMSI CATANIA HARBOUR Example of daily tracks within 18 km SN1-EMSO coordinates: 29 of November 2012 (using Matlab scripts) Sara Pulvirenti Erice, 18/10/2013 7

10 AIS data correlation with acoustic data
nfft = 2^10 Overlap = 50% Daily spectrogram of 29 th of November 2012 dB re 1 uPa^2/Hz t1 t2 MMSI: MMSI: MMSI: MMSI: MMSI: MMSI: MMSI: MMSI: MMSI: MMSI: MMSI: Distance fromSN1-EMSO [km] Integrated noise from 44.8 Hz to 178 Hz Sara Pulvirenti Erice, 18/10/2013 8

11 AIS data correlation with acoustic data
Spectra from different vessels have been studied: MMSI: (CARGO) 20/26050 records MMSI: (TANKER) 25/26050 records MMSI: (PASSENGER) 25/26050 records within than ~ 6 dB all selected spectra from the same vessel are almost overlapped. Sara Pulvirenti Erice, 18/10/2013 9

12 AIS data correlation with acoustic data
MMSI: (TANKER) SPEED OVER GROUND 15 knots 0,369 km from SN1-EMSO coordinates MMSI: (CARGO) SPEED OVER GROUND 17,7 knots DISTANCE FROM SN1 0,149 km from SN1-EMSO coordinates nfft = 2^13 Overlap = 95% dB re 1 uPa^2/Hz Closest point of approach Sara Pulvirenti Erice, 18/10/2013 10

13 Conclusion We installed SN1-EMSO offshore Catania, a preliminary analysis < 1kHz has been performed. This data will be compared with acoustic data from SMO acoustic antenna in Portopalo (see R.Grasso poster) and SMO-EMSO station in a range < 96 kHz. A correlated study between acoustic data from a calibrated hydrophone (2100 m depth) and AIS information allow to analyse the acoustic noise in the area of the Gulf of Catania. The strength of the system is the possibility to develop predict model in order to predict the ambient noise in places where there are no underwater sensors. Future steps -> This analysis is a preliminary study for CABIRIA and EMSO projects to evaluate the contribution of shipping noise to the marine enviroment. Sara Pulvirenti Erice, 18/10/2013 12

14 0,061 km from SN1-EMSO coordinates
Conclusion PASSENGER MMSI: 0,061 km from SN1-EMSO coordinates nfft = 2^13 Overlap = 95% CASE OF STUDY Closest point of approach Sara Pulvirenti Erice, 18/10/2013 11

15 Grazie Sara Pulvirenti Erice, 18/10/2013

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