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Now showing items 41-48 of 48
Wave-, wind-, and tide-driven circulation at a well-mixed ocean inlet
(Massachusetts Institute of Technology, 2017)
The effects of waves, wind, and bathymetry on tidal and subtidal hydrodynamics at unstratified, shallow New River Inlet, NC, are evaluated using field observations and numerical simulations. Tidal flows are ebb-dominated ...
Scattering of the low-mode internal tide at the Line Islands Ridge
(Massachusetts Institute of Technology, 2015)
The scattering of low-mode internal tides by ocean-floor topography is extensively studied through analytical models and field observations at the Line Islands Ridge (LIR). An existing Green function method is utilized to ...
The feasibility of sodar wind profile measurements from an oceanographic buoy
(Massachusetts Institute of Technology, 2006)
This thesis explores the feasibility of making wind speed profile measurements from an oceanographic buoy using a Doppler sodar. In the fall of 2005, we deployed a Scintec SFAS sodar on an ASIS buoy. Roughly one week of ...
Effects of internal waves on low frequency, long range, acoustic propagation in the deep ocean
(Massachusetts Institute of Technology, 2007)
This thesis covers a comprehensive analysis of long-range, deep-ocean, low-frequency, sound propagation experimental results obtained from the North Pacific Ocean. The statistics of acoustic fields after propagation through ...
Laboratory evaluation of laser-induced breakdown spectroscopy (LIBS) as a new in situ chemical sensing technique for the deep ocean
(Massachusetts Institute of Technology, 2007)
Present-day expeditionary oceanography is beginning to shift from a focus on short-term ship and submersible deployments to an ocean observatory mode where long-term temporally-focused studies are feasible. As a result, a ...
Target tracking onboard an autonomous underwater vehicle : determining optimal towed array heading in an anisotropic noise field
(Massachusetts Institute of Technology, 2007)
In order to overcome the challenges that an anisotropic noise field poses for underwater target tracking, we conduct an onboard estimation of the horizontal noise directionality in the real-time processing suite of an ...
Modifiable stability and maneuverability of high speed unmanned underwater vehicles (UUVs) through bioinspired control fins
(Massachusetts Institute of Technology, 2020)
Underwater Vehicles generally have control fins located only near their aft end, for making controllable changes in directions. This design allows for stability of control; however, the turns are typically large in comparison ...
Signal absorption-based range estimator for undersea swarms
(Massachusetts Institute of Technology, 2020)
Robotic swarms are becoming increasingly complex on the surface and in air due to highspeed and reliable communication links, Global Positioning Satellites (GPS), and visual support to relative navigation. However, the ...