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Acoustic monitoring of gas emissions from the seafloor. Part I: quantifying the volumetric flow of bubbles ArchiMer
Leblond, Isabelle; Scalabrin, Carla; Berger, Laurent.
Three decades of continuous ocean exploration have led us to identify subsurface fluid related processes as a key phenomenon in marine earth science research. The number of seep areas located on the seafloor has been constantly increasing with the use of multi-scale imagery techniques. Due to recent advances in transducer technology and computer processing, multibeam echosounders are now commonly used to detect submarine gas seeps escaping from the seafloor into the water column. A growing number of en-route surveys shows that sites of gas emissions escaping from the seafloor are much more numerous than previously thought. Estimating the temporal variability of the gas flow rate and volumes escaping from the seafloor has thus become a challenge of relevant...
Tipo: Text Palavras-chave: Seafloor observatory; Water column acoustics; Forward and inverse modeling; Fisheries echosounders; Acoustic backscattering; Gas emissions; Bubbles; Water tank experiments.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00192/30336/29094.pdf
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Caractérisation et dynamique des turbidités en zone côtière : L'exemple de la région marine Bretagne Sud ArchiMer
Tessier, Caroline.
The space and time turbidity variability in Southern Brittany was studied, from the combination of results of hydrological campaigns, long-term instrumented moorings, satellite observations and 3D process-based numerical modelling. Previous observations exhibit a cross-shore concentration gradient with values hardly exceeding 30 mg/l beyond the littoral zone. Acoustic profilers (ADCP) were moored to measure currents, waves and the associated dynamics of fine particles. Time series of mass concentration in the whole water column were estimated from the analysis of the backscattered signal. During wave episodes, values can reach 100 mg/l at 1.50 m above bottom, just outside the Bay of Vilaine. The empirical calibration of the signal with independent...
Tipo: Text Palavras-chave: Southern Brittany; MARS 3D numerical model; Acoustic backscattering; Acoustic current profiler; Waves; Circulations; Turbidity; Bretagne Sud; Modèle numérique MARS 3D; Rétrodiffusion acoustique; Profileur acoustique de courant; Vagues; Circulations; Turbidité.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-2325.pdf
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