Geoacoustic inversions using Combustive Sound Source data from Shallow Water-2006 experiment

Potty, Gopu R.; Miller, James H.

doi:10.1109/sympol.2009.5664154

2009 International Symposium on Ocean Electronics (SYMPOL 2009) 2009

DOI: 10.1109/sympol.2009.5664154

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Geoacoustic inversions using Combustive Sound Source data from Shallow Water-2006 experiment

Gopu R. Potty

James H. Miller

Abstract: Combustive Sound Source (CSS) data collected on Single Hydrophone Receiving Units (SHRU), in water depths ranging from 65 m to 110 m, during the Shallow Water 2006 experiment clearly show modal dispersion effects and are suitable for modal geoacoustic inversions. CSS shots were set off at 26 m depth in 100 m of water. The inversions performed are based on an iterative scheme using dispersion-based short time Fourier transform in which each time-frequency tiling is adaptively rotated in the time-frequency plane… Show more

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Cited by 2 publications

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Seafloor Shear Measurement Using Interface Waves

Miller

Potty²

2011

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The long term goal of our research is to improve the estimation of bottom properties by understanding and incorporating the effects produced by shear. OBJECTIVESThe objectives of this proposal are to:• Develop an acoustic/seismic receive system for the estimation of sediment compressional wave speed, compressional wave attenuation and shear wave speed.• Develop new inversion techniques for shear properties: A new inversion scheme is being developed to estimate shear properties of the sediment using interface wave dispersion. Figure 1 shows the conceptual schematic of the system.This shear measurement system consists of the following components: APPROACH1. Sled: The sled houses the data acquisition system. The sled will be connected to a tow cable with appropriate chain and floatation to isolate the wave motion from the geophone/ hydrophone receive array. The termination of the tow cable at the surface will consist of a float and appropriate mechanical connectors to deploy, move, leave, and recover the system.2. Acquisition System: Two Several Hydrophone Receive Systems (SHRUs) serve as the data collection system.3. Receive array: The receive array consists of gimbaled geophones and hydrophones. There will be a float connected to the geophone end of the system as a backup in case the other float is lost. The geophone end will be properly weighed down to filter out the surface wave motions by a chain and/or weight.

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Seafloor Shear Measurement Using Interface Waves

Miller

Potty²

2011

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Estimation of Ocean and Seabed Parameters and Processes Using Low Frequency Acoustic Signals

Miller

Potty²

2012

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The long term goals of our research are to: • Understand, model and exploit the acoustic propagation physics in shallow water in the presence of ocean fronts and internal waves. This goal conforms to the major theme of the Shallow Water 06 experiment i.e. 3-D acoustic effects. The effects of oceanographic variability such as frontal meander, and internal solitary waves on 3-D acoustic reflection and refraction will be investigated. • Improve inversion schemes for the estimation of sediment geoacoustic properties using low frequency broadband acoustic signals. The existing inversion method has been shown to successfully map compressional wave speed. The new work will focus on understanding the frequency and depth dependence of compressional wave attenuation and develop new inversion schemes for shear wave properties. We hypothesize that water-borne acoustic arrival properties such as their Airy Phase are sensitive to sediment shear properties. OBJECTIVES We are proposing to address our goals with a series of objectives: A. Characterize 3-D acoustic variability due to internal waves and fronts. The tasks associated with this objective are: 1. Data analysis: Acoustic signals transmitted from the R/V Sharp in the Shallow Water 06 Experiment at various ranges and angles to the WHOI Shark Array and Single Hydrophone Receive Units (SHRU) will be analyzed. 2. Calculate various intensity metrics: Different intensity metrics will be calculated, including scintillation Index (SI), integrated energy over the depth of the array and over the duration of the acoustic signal, temporally integrated energy over the duration of the acoustic signal on a single hydrophone, single hydrophone intensity observations.

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Geoacoustic inversions using Combustive Sound Source data from Shallow Water-2006 experiment

Cited by 2 publications

References 12 publications

Seafloor Shear Measurement Using Interface Waves

Seafloor Shear Measurement Using Interface Waves

Estimation of Ocean and Seabed Parameters and Processes Using Low Frequency Acoustic Signals

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