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Florent Le Courtois

Florent Le Courtois
DGA TN

PhD

About

34
Publications
5,189
Reads
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165
Citations
Introduction
Florent Le Courtois currently works at Shom. Florent does research in Underwater Acoustics, Bioacoustics and Signal processing. He has been dealing with inverse problem applied to underwater acoustics. The current project is 'MSFD national technical coordination of descriptor 11 (underwater noise).' It aims at defining the good ecological status regarding underwater noise pollution impacts on the ecosystem.
Additional affiliations
December 2008 - December 2011
SNCF
Position
  • Research Assistant

Publications

Publications (34)
Book
Full-text available
Chapter 1.1: Purpose and scope The purpose of this Document is to guide Member States in the review and update of the assessment of their marine waters in respect of each marine region or subregion, according to Article 17(2)(a) in conjunction with Articles 8(1) and 9(1) MSFD, which is due for reporting by 15 October 2024 and in subsequent reportin...
Article
Full-text available
Underwater noise pollution from impulsive sources (e.g. explosions, seismic airguns, percussive pile driving) can affect marine fauna through mortality, physical injury, auditory damage, physiological stress, acoustic masking, and behavioural responses. Given the potential for large-scale impact on marine ecosystems, some countries are now monitori...
Poster
Full-text available
Nowadays shipping has been identified as the major contributor to ocean noise (NRC, 2003; Hildebrand, 2009). The anthropogenic sound sources constitute a pressure on marine mammals (Southall, 2007). Mysticetes, such as the fin whale Balaenoptera physalus, are mammals that emit at low frequencies, are presumably more likely to be disturbed by low fr...
Presentation
Noise from shipping activities is considered as an anthropogenic pressure that could impact ecosystems. Noise maps provide relevant tool to assess the anthropogenic pressure and infer risk on animal populations. To answer the Marine Strategy Framework Directive regarding underwater noise pollution requirements, QuietMED Project aims to initiate cap...
Conference Paper
Full-text available
Sound propagation in a fluctuating medium can be impacted by local space and time variation of the celerity. In the ocean, this environmental variability is mainly due to internal waves, tides or gyres and is well studied by oceanographers. More specifically, major research tackles the issue of characterizing the impact of these internal waves on a...
Article
Shipping noise has been identified as a threat on underwater ecosystems. In particular, several impacts have been documented on cetaceans, e.g., communication’s masking and stress increasing. To assess the risk related to such anthropogenic noise requires both quantifying the noise levels and estimating the distribution of the cetaceans’ population...
Article
Underwater soundscape may be seen as an intrinsic feature of the environment in which it is recorded. In fact, underwater soundscape is a complex combination of sounds from a variety of acoustic sources, whether from natural or from human origin. When the distances between the sources and the receivers are sufficiently large, the received signals a...
Article
The management of underwater noise within the European Union's waters is a significant component (Descriptor 11) of the Marine Strategy Framework Directive (MSFD). The indicator related to continuous noise, is the noise levels in two one-third octave bands centered at 63 Hz and 125 Hz. This paper presents an analysis of underwater noise in the Celt...
Data
The shipping noise is a major component of the underwater soundscape at low frequency. The increase of the fleet size at world scale for several decades have arisen the potential impacts of noise pollution on marine ecosystems.Modeling the shipping noise levels at large scale became an important task of marine environmental policies. However, becau...
Data
The management of underwater anthropogenic noise is becoming a significant component of marine policies. Rules to limit noise exposure in a way that marine animals are not adversely affected are expected to be set up in the future. However, modeling or measuring underwaternoise levels (orother suitable metrics) can still be subject to a lot of unce...
Article
The management of underwater anthropogenic noise is becoming a significant component of marine policies. Rules to limit noise exposure in a way that marine animals are not adversely affected are expected to be set up in the future. However, modeling or measuring underwaternoise levels (orother suitable metrics) can still be subject to a lot of unce...
Article
The shipping noise is a major component of the underwater soundscape at low frequency. The increase of the fleet size at world scale for several decades have arisen the potential impacts of noise pollution on marine ecosystems.Modeling the shipping noise levels at large scale became an important task of marine environmental policies. However, becau...
Presentation
Full-text available
Presentation of the workshop ”Fostering inter-regional cooperation in underwater noise monitoring and impact assessment in waters around Europe, within the context of the European Marine Strategy Framework Directive” organized by ACCOBAMS during ECS 2017
Article
In underwater acoustics, shallow-water environments act as modal dispersive waveguides when considering low-frequency sources, and propagation can be described by modal theory. In this context, propagated signals are composed of few modal components, each of them propagating according to its own wavenumber. Frequency-wavenumber $(f-k)$ representati...
Presentation
Full-text available
The increase of the world fleet size for several decades may lead to a global increase of the traffic ambient noise levels in the oceans. The threat of an impact on biodiversity is high enough to promote the idea that potential harmful noise levels should be avoided, or at least controlled and regulated. For this purpose, it is necessary to estimat...
Conference Paper
Full-text available
The increase of the world fleet size for several decades may lead to a global increase of the traffic ambient noise levels in the oceans. The threat of an impact on biodiversity is high enough to promote the idea that potential harmful noise levels should be avoided, or at least controlled and regulated. For this purpose, it is necessary to estimat...
Presentation
Full-text available
Depuis 2008, la Directive Cadre Stratégique pour le Milieu Marin s’intéresse à définir le bon état écologique (BEE) dans les eaux européennes à travers onze descripteurs de pressions anthropiques, d’impacts et d’état du milieu. Le descripteur 11 (D 11) définit les pressions des sources d’énergie introduites par l’homme ; la pollution sonore y est r...
Article
In shallow water, low-frequency acoustic propagation is described by modal theory. In this context, the environment acts as a dispersive waveguide, and the geoacoustic properties of the seabed can be inferred from the modal wavenumbers. When considering horizontal aperture (using a horizontal array or a towed source), wavenumber estimation is a wel...
Article
Full-text available
Thanks to its easy implementation and robust performance, beamforming is applied for source localisation in several fields. Its effectiveness depends greatly on the array sensor configuration. This paper introduces a criterion to improve the array beampattern and increase the accuracy of sound source localisation. The beamwidth and the maximum side...
Article
Estimation of the acoustic wave numbers presents great interests in shallow environments. They provide relevant material to infer the sediment parameters. Using a horizontal array,the wavenumbers are obtained with usual spectral estimation methods in the spatial dimension. The computation of the wavenumber spectra at several frequencies leads to a...
Article
In shallow water zones and at low frequency, seabed and water column properties can be estimated from the acoustic wavenumbers using inversion algorithms. When considering horizontal line arrays (HLA) and narrowband sources, the wavenumbers can be evaluated with classic spectral analysis methods. In this paper, a compressed sensing (CS) method for...
Article
In underwater acoustics, shallow water environments (d <; 200 m) act as dispersive waveguide when considering low-frequency sources (f <; 250 Hz), and propagation is described by modal theory. Propagated signals are usually multicomponent, and the group delay of each mode (each component) is dispersive and varies with mode number. The waveguide dis...
Conference Paper
Full-text available
Afin de réduire la pollution sonore dans le domaine des transports, il est nécessaire d'avoir une connaissance précise des propriétés des sources de bruit en mouvement. Un moyen d'atteindre cet objectif est d'utiliser une antenne de microphones couplé à un traitement de formation de voies. Il repose sur l'hypothèse de sources ponctuelles et harmoni...
Article
In a shallow water environment, wavenumbers can be estimated by computing time and spatial Fourier transforms of horizontal array measurements. The frequency-wavenumber representation allows wide band estimation but a sufficient number of hydrophones are required for accurate wavenumber resolution. This paper presents the application of an autoregr...
Article
Full-text available
The reduction of the noise pollution due to transportation is a major environmental concern. VAMPPASS is a program for simulating the by-pass noise~; several reduction solutions are investigated and compared. Source characteristics are used as VAMPPASS inputs. They are defined by their positions, spectra and acoustic levels. Beamforming is an array...
Conference Paper
Environmental noise is a major concern for the railway transportation. The characterization of the main noise sources of a train during its pass-by is needed to develop the most relevant noise reduction solutions. Microphone antenna measurement and beamforming signal processing have been used by SNCF to provide source positions, spectra and levels...
Conference Paper
Full-text available
La caractérisation des sources sonores par traitement d'antenne, en niveau, en spectre et en localisation sur le matériel ferroviaire en mouvement demande de plus en plus de précision et de justesse. En anten-nerie, la position des capteurs définit les propriétés de l'antenne et ainsi les performances de la mesure. L'objectif du travail est de disp...

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Projects

Projects (2)
Project
implementation of the Maritime STrategy Framework directive including - GES definition and assessment - monitoring program corrdination - coordination with nation competent authorities & international experts groups (TG Noise, ICG Ospar, ....)