Gobat Jason I.

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Gobat
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Jason I.
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Start date: 1997 × End date: 1999 ×

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  • Technical Report
    The horizontal mooring : a two-dimensional array, description of the array, components, instrumentation, deployment and recovery operations
    (Woods Hole Oceanographic Institution, 1999-09) Trask, Richard P. ; Anderson, Steven P. ; Way, Bryan S. ; Ostrom, William M. ; Paul, Walter ; Grosenbaugh, Mark A. ; Gobat, Jason I. ; Weller, Robert A.
    A moored two-dimensional array with instrumentation distributed both horizontally and vertically was deployed for 27 days in August 1998 at an 85 meter deep site in Massachusetts Bay near Stellwagon basin. The horizontal mooring consisted of a 160- meter long horizontal element positioned at a depth of 20 meters between two subsurface moorings. Suspended below the horizontal member were five 25-meter long vertical strings. The vertical strings had a horizontal separation of 30 meters and each had instruments at depths of 20, 25, 30, 35, 40 and 45 meters. Instrumentation deployed on the two-dimensional array included acoustic current meters, temperature sensors, conductivity measuring instruments, pressure sensors and motion monitoring packages. This report includes a detailed description of the two-dimensional array, the anchoring system and the instrumentation that were deployed. Also included is a description of the deployment and recovery techniques that were employed as well as an assessment of the performance of the array.
  • Technical Report
    WHOI cable : time domain numerical simulation of moored and towed oceanographic systems
    (Woods Hole Oceanographic Institution, 1997-11) Gobat, Jason I. ; Grosenbaugh, Mark A. ; Triantafyllou, Michael S.
    This report presents a numerical framework for analyzing the statics and dynamics of cable strctures commonly encountered in oceanographic engineering practice. The numerical program, WHOI Cable, features a nonlinear solver that includes the effects of geometric and material nonlinearties, bending stiffness for seamless modeling of slack cables, and a model for the interaction of cable segments with the seafoor. The program solves both surface and subsurface single-point mooring problems, systems with both ends anchored on the bottom, and towing and drifter problems. Forcing includes waves, current, ship speed, and pay-out of cable. The programs that make-up WHOI Cable run under Unix, DOS, and Windows. There is a familiar Windows-style interface available for Windows 95 and Windows NT platforms. In the report, the mathematical and numerical framework for WHOI Cable is described, followed by detailed instructions for formulating problem input files and running the codes. Examples are included in an appendix to highlight the range of problems that WHOI Cable can solve.