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Production acoustique d'une flottille côtière : Application au suivi environnemental et à l'identification automatisée de sources sonores anthropiques

Caroline Magnier 1
1 GIPSA-SIGMAPHY - GIPSA - Signal Images Physique
GIPSA-DIS - Département Images et Signal
Abstract : Marine traffic is the main contributor to anthropogenic underwater noise: since the 1970s, the increase in deep-sea shipping has increased the ambient noise by more than 10 dB in some areas. In response to this concern, the Marine Strategy Framework Directive (MSFD) recommends acoustic monitoring. Few studies are concerned with coastal activity and the noises radiated by small craft while these coastal environments are the purveyors of 41.7% of the ecosystem services produced by the oceans.Between the academic and the industrial world, this PhD was to answer the different scientific and industrial questions on the topic of the coastal traffic in terms of the influence in the soundscape and the detection and classification of the coastal craft.Without information on the coastal maritime traffic, a visual identification protocol is proposed using GoPro® images processing and produced the same data as the AIS (position, speed, size and type of craft); It allows to create maritime traffic maps on a disk of 1.6km radius. The traffic is characterized by two acoustic descriptors: the SPL linked to the distance of the nearest boat and the ANL linked to the number of boats present in a 500 m radius disc. The spatiotemporal monitoring of these descriptors allows to identify the impact on the maritime traffic on the coastal acoustic landscape. The acoustic detection and the classification are performed after individual characterization of the noise by a set of acoustic parameters and using of supervised machine learning algorithm. A specific protocol for the creation of the classification tree is proposed by comparing the acoustic data with the physical and contextual characteristics of each boat.The methods are applied on the flotilla of coastal boats present in the Bay of Calvi (Corsica) during summer.
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https://tel.archives-ouvertes.fr/tel-02017556
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Submitted on : Wednesday, February 13, 2019 - 11:24:09 AM
Last modification on : Wednesday, August 25, 2021 - 4:07:54 PM
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  • HAL Id : tel-02017556, version 1

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Caroline Magnier. Production acoustique d'une flottille côtière : Application au suivi environnemental et à l'identification automatisée de sources sonores anthropiques. Acoustique [physics.class-ph]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAU040⟩. ⟨tel-02017556⟩

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