Antartic blue whale localization with ocean bottom seismometers in southern indian ocean
While visual survey of whales requires substantial means for limited areas, passive acoustic monitoring (PAM) offers larger scale coverage for long periods and less costs. It usually provides information about species behavior, e.g. seasonal movements, but tools are needed to detail the individuals&...
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/76727 2023-05-15T13:46:02+02:00 Antartic blue whale localization with ocean bottom seismometers in southern indian ocean DREO, Richard BOUFFAUT, Léa GUILLON, Laurent LABAT, Valérie BARRUOL, Guilhem BOUDRAA, Abdel-Ouahab 2017 https://oskar-bordeaux.fr/handle/20.500.12278/76727 en eng https://oskar-bordeaux.fr/handle/20.500.12278/76727 UACE2017 - 4th Underwater Acoustics Conference and Exhibition Sciences de l'ingénieur [physics]/Acoustique [physics.class-ph] Sciences de l'ingénieur [physics]/Traitement du signal et de l'image Communication dans un congrès avec actes 2017 ftoskarbordeaux 2021-05-18T22:31:02Z While visual survey of whales requires substantial means for limited areas, passive acoustic monitoring (PAM) offers larger scale coverage for long periods and less costs. It usually provides information about species behavior, e.g. seasonal movements, but tools are needed to detail the individuals' behavior. From October 2012 to November 2013 as part of the German-French "RHUM-RUM" (Réunion Hotspot and Upper Mantle - Réunion Unterer Mantel) seismic experiment, a 70km by 40km array of 8 Ocean Bottom Seismometers (OBS) was deployed in Southern Indian Ocean in a mountainous area, with depths from 2500 to 5500 meters. The [0-50] Hz-frequency band covered by the OBS's hydrophone provides observations about whales. Each source-OBS path has its own acoustic propagation. Indeed, closest OBS can be reached by direct rays, while remote OBS can only be reached by multi-reflected rays. Therefore, the localization problem cannot be solved directly using a classical Time Difference Of Arrival (TDOA) algorithm. In this work, the TDOA problem is solved in the case of long range detection, even with mountainous relief, enabling localization and tracking of whales. For each point of the spatial matrix representing the area, Times Of Arrival (TOA) of signal on the OBS are computed with a ray tracing algorithm (BELLHOP), taking into account the bottom profile. The theoretical corresponding TDOA are then compared to measured ones using a loss function. The obtained results, using L1, L2, cross-correlation cost functions, show the effectiveness of the proposed strategy to track whales on their calls. For example, an Antarctic blue whale is tracked during 10 hours from 40 kilometers south of the array center to 40 kilometers north where the mean speed is close to 10 km/h on a straight trajectory. Other/Unknown Material Antarc* Antarctic antartic* Blue whale OSKAR Bordeaux (Open Science Knowledge ARchive) Antarctic Indian |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Sciences de l'ingénieur [physics]/Acoustique [physics.class-ph] Sciences de l'ingénieur [physics]/Traitement du signal et de l'image |
spellingShingle |
Sciences de l'ingénieur [physics]/Acoustique [physics.class-ph] Sciences de l'ingénieur [physics]/Traitement du signal et de l'image DREO, Richard BOUFFAUT, Léa GUILLON, Laurent LABAT, Valérie BARRUOL, Guilhem BOUDRAA, Abdel-Ouahab Antartic blue whale localization with ocean bottom seismometers in southern indian ocean |
topic_facet |
Sciences de l'ingénieur [physics]/Acoustique [physics.class-ph] Sciences de l'ingénieur [physics]/Traitement du signal et de l'image |
description |
While visual survey of whales requires substantial means for limited areas, passive acoustic monitoring (PAM) offers larger scale coverage for long periods and less costs. It usually provides information about species behavior, e.g. seasonal movements, but tools are needed to detail the individuals' behavior. From October 2012 to November 2013 as part of the German-French "RHUM-RUM" (Réunion Hotspot and Upper Mantle - Réunion Unterer Mantel) seismic experiment, a 70km by 40km array of 8 Ocean Bottom Seismometers (OBS) was deployed in Southern Indian Ocean in a mountainous area, with depths from 2500 to 5500 meters. The [0-50] Hz-frequency band covered by the OBS's hydrophone provides observations about whales. Each source-OBS path has its own acoustic propagation. Indeed, closest OBS can be reached by direct rays, while remote OBS can only be reached by multi-reflected rays. Therefore, the localization problem cannot be solved directly using a classical Time Difference Of Arrival (TDOA) algorithm. In this work, the TDOA problem is solved in the case of long range detection, even with mountainous relief, enabling localization and tracking of whales. For each point of the spatial matrix representing the area, Times Of Arrival (TOA) of signal on the OBS are computed with a ray tracing algorithm (BELLHOP), taking into account the bottom profile. The theoretical corresponding TDOA are then compared to measured ones using a loss function. The obtained results, using L1, L2, cross-correlation cost functions, show the effectiveness of the proposed strategy to track whales on their calls. For example, an Antarctic blue whale is tracked during 10 hours from 40 kilometers south of the array center to 40 kilometers north where the mean speed is close to 10 km/h on a straight trajectory. |
format |
Other/Unknown Material |
author |
DREO, Richard BOUFFAUT, Léa GUILLON, Laurent LABAT, Valérie BARRUOL, Guilhem BOUDRAA, Abdel-Ouahab |
author_facet |
DREO, Richard BOUFFAUT, Léa GUILLON, Laurent LABAT, Valérie BARRUOL, Guilhem BOUDRAA, Abdel-Ouahab |
author_sort |
DREO, Richard |
title |
Antartic blue whale localization with ocean bottom seismometers in southern indian ocean |
title_short |
Antartic blue whale localization with ocean bottom seismometers in southern indian ocean |
title_full |
Antartic blue whale localization with ocean bottom seismometers in southern indian ocean |
title_fullStr |
Antartic blue whale localization with ocean bottom seismometers in southern indian ocean |
title_full_unstemmed |
Antartic blue whale localization with ocean bottom seismometers in southern indian ocean |
title_sort |
antartic blue whale localization with ocean bottom seismometers in southern indian ocean |
publishDate |
2017 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/76727 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic antartic* Blue whale |
genre_facet |
Antarc* Antarctic antartic* Blue whale |
op_source |
UACE2017 - 4th Underwater Acoustics Conference and Exhibition |
op_relation |
https://oskar-bordeaux.fr/handle/20.500.12278/76727 |
_version_ |
1766235300565090304 |