Subseafloor geoacoustic characterization in the kilohertz regime with a broadband source and a 4-element receiver array

摘要: Maritime Rapid Environmental Assessment experiments (MREA/BP'07) were carried out southeast of the island Elba in Mediterranean Sea spring 2007 with aim to produce an integrated 4D (3-dimensional space and time) picture that shallow water environment. Several standard advanced techniques environmental characterization covering fields underwater acoustics, physical oceanography geophysics combined within a coherent scheme data acquisition, processing assimilation. This paper focuses on technique developed for rapid 3D geoacoustic subseafloor via ldquorange-independent inversionrdquo runs subareas predetermined basis geological ground truth initial hydrographic geophysical survey. The uses broadband source 1.2-kHz center frequency, drifting vertical array four 5-m spaced, model-based matched filter (MBMF) Bayesian inversion. Experimental results are excellent agreement earlier Yellow Shark sparse-array same area demonstrating feasibility using fully-coherent MBMF at higher frequencies (0.85-1.55 kHz) shorter ranges (1-2 km), therefore lighter instrumentation is easily deployed by hand from small high-speed boat or mounted remotely operated autonomous vehicles.