The multibeam echo sounder system can not only obtain high-precision seabed bathymetry data, but also high-resolution seabed backscatter strength data. A number of studies have applied acoustic remote sensing method to classify seabed sediment type with multibeam backscatter strength data (unsupervised), and to obtain a rapid, areal and therefore better classification results than the traditional sediment sampling method (supervised). Through data integration and the use of seabed-mapping technologies it is possible to obtain a high-resolution (HR) study of seabed morphology and nature, discriminating specific targets, benthic features and habitats at different spatial scales in various water depth and bottom types (morphology and materials) such the deep coral banks in the Levante Canyon (Ligurian Sea), the volcanic complex of Panarea (Eolian Islands, Tyrrhenian Sea) case studies or highlighting the environmental dynamics trough time and space using hydrographic monitoring like the evolution of the Magra River and its adjacent Ligurian coast. This specific goal was achieved processing the historical data series stored in the archive of the Italian Hydrographic Institute and more recent surveys. Data are completely comparable because they follow the same hydrographic standards during time. In fact, the data available were collected in the last 135 years with different equipment (from lead line to acoustic multibeam system), scale and processing. The method used for this hydrographic research is based upon data integration and multiple focusing approaches to identify areas to be investigated with different resolution systems in order to perform data exploitation and multiple usages of available resources.
Gli ecoscandagli multibeam non sono solo in grado di acquisire dati batimetrici ad alta precisione ma anche di registrare l’intensità del backscatter del fondale ad alta risoluzione. Molti studi sono stati effettuati sul “remote sensing” acustico con lo scopo di classificare il fondale tramite il dato di basckscatter (approccio unsupervised) ed ottenere una rapida, aerea e possibilmente migliore classificazione rispetto il tradizionale campionamento diretto (approccio supervised). Tramite l’integrazione di dati e l’impiego di tecnologie che consentono il seabed mapping è possibile ottenere uno studio ad alta risoluzione della morfologia del fondale, discriminando feature di fondo e habitat a differenti scale spaziali, a varie profondità e con differenti tipologie di fondale (morfologia e materiali) come i banchi di corallo profondi nel Canyon di Levante (Mar Ligure), il complesso vulcanico di Panarea (Isole Eolie, Mar Tirreno) o evidenziare le dinamiche ambientali nel tempo e nello spazio tramite il monitoraggio idrografico dell’evoluzione del fiume Magra e della costa adiacente. Questo specifico obiettivo è stato raggiunto grazie all’analisi delle serie storiche di dati dell’Istituto Idrografico della Marina e rilievi più recenti resi comparabili poiché conformi al medesimo standard idrografico. Infatti i dati analizzati sono stati raccolti negli ultimi 135 anni con differenti strumenti (dal filo a piombo al multibeam), scale e elaborazione. Il metodo impiegato per questa ricerca idrografica è basato sulla integrazione di dati ed un approccio iterativo a diverse scale al fine di individuare le aree da investigare ulteriormente con sistemi a differente risoluzione e massimizzare così l’impiego delle risorse e dei dati a disposizione.
SEABED NATURE AND MORPHODYNAMICS: HIGH RESOLUTION INTEGRATED ACOUSTIC DATA ANALYSIS
PRATELLESI, Marta
2017
Abstract
The multibeam echo sounder system can not only obtain high-precision seabed bathymetry data, but also high-resolution seabed backscatter strength data. A number of studies have applied acoustic remote sensing method to classify seabed sediment type with multibeam backscatter strength data (unsupervised), and to obtain a rapid, areal and therefore better classification results than the traditional sediment sampling method (supervised). Through data integration and the use of seabed-mapping technologies it is possible to obtain a high-resolution (HR) study of seabed morphology and nature, discriminating specific targets, benthic features and habitats at different spatial scales in various water depth and bottom types (morphology and materials) such the deep coral banks in the Levante Canyon (Ligurian Sea), the volcanic complex of Panarea (Eolian Islands, Tyrrhenian Sea) case studies or highlighting the environmental dynamics trough time and space using hydrographic monitoring like the evolution of the Magra River and its adjacent Ligurian coast. This specific goal was achieved processing the historical data series stored in the archive of the Italian Hydrographic Institute and more recent surveys. Data are completely comparable because they follow the same hydrographic standards during time. In fact, the data available were collected in the last 135 years with different equipment (from lead line to acoustic multibeam system), scale and processing. The method used for this hydrographic research is based upon data integration and multiple focusing approaches to identify areas to be investigated with different resolution systems in order to perform data exploitation and multiple usages of available resources.File | Dimensione | Formato | |
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