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Now showing items 11-20 of 20
Three-dimensional acoustic propagation through shallow water internal, surface gravity and bottom sediment waves
(Massachusetts Institute of Technology, 2011)
This thesis describes the physics of fully three-dimensional low frequency acoustic interaction with internal waves, bottom sediment waves and surface swell waves that are often observed in shallow waters and on continental ...
Understanding and utilizing waveguide invariant range-frequency striations in ocean acoustic waveguides
(Massachusetts Institute of Technology, 2011)
Much of the recent research in ocean acoustics has focused on developing methods to exploit the effects that the sea surface and seafloor have on acoustic propagation. Many of those methods require detailed knowledge of ...
A computational approach to the quantification of animal camouflage
(Massachusetts Institute of Technology, 2014)
Evolutionary pressures have led to some astonishing camouflage strategies in the animal kingdom. Cephalopods like cuttlefish and octopus mastered a rather unique skill: they can rapidly adapt the way their skin looks in ...
Contributions to automated realtime underwater navigation
(Massachusetts Institute of Technology, 2012)
This dissertation presents three separate-but related-contributions to the art of underwater navigation. These methods may be used in postprocessing with a human in the loop, but the overarching goal is to enhance vehicle ...
Stratification on the Skagit Bay tidal flats
(Massachusetts Institute of Technology, 2012)
Estuarine density stratification may be controlled primarily by cross-shore processes (analogous to longitudinal control in narrow estuaries), or by both cross- and alongshore processes (typical of coastal plumes). Here ...
Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots
(Massachusetts Institute of Technology, 2013)
Autonomous marine vehicles are increasingly used in clusters for an array of oceanographic tasks. The effectiveness of this collaboration is often limited by communications: throughput, latency, and ease of reconfiguration. ...
Hydrodynamics of a multiple tidal inlet system : Katama Bay, Martha's Vineyard, MA
(Massachusetts Institute of Technology, 2015)
Observations, theoretical models, and a numerical model (ADCIRC) are used to investigate the effects of tides, waves, bay bathymetry, and changing inlet geometry on the hydrodynamics of the multiple-inlet Katama system, ...
Performance analysis for lateral-line-inspired sensor arrays
(Massachusetts Institute of Technology, 2011)
The lateral line is a critical component of the fish sensory system, found to affect numerous aspects of behavior including maneuvering in complex fluid environments, schooling, prey tracking, and environment mapping. This ...
Broadband and statistical characterization of echoes from random scatterers : application to acoustic scattering by marine organisms
(Massachusetts Institute of Technology, 2013)
The interpretation of echoes collected by active remote-sensing systems, such as sonar and radar, is often ambiguous due to the complexities in the scattering processes involving the scatterers, the environment, and the ...
Passive wake detection using seal whisker-inspired sensing
(Massachusetts Institute of Technology, 2015)
This thesis is motivated by a series of biological experiments that display the harbor seal's extraordinary ability to track the wake of an object several seconds after it has swum by. They do so despite having auditory ...