Agrawal Yogesh C.

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Agrawal
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Yogesh C.
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  • Technical Report
    A study of CTD cables and lowering systems
    (Woods Hole Oceanographic Institution, 1979-12) Berteaux, Henri O. ; Walden, Robert G. ; Moller, Donald A. ; Agrawal, Yogesh C.
    This study first reviews both the electrical and mechanical modes and causes of failure of electromechanical (E/M) cables used to lower deep sea sensors, such as CTD instruments, from oceanographic ships. It then outlines measures or steps that could be taken to correct some of the deficiencies observed and improve the systems presently used. These measures include quality control, tests, operational limits, improved handling and maintenance, improved machinery. The study then surveys alternative cables for lowering the sensors and convey the information from the sensors back to the ship. These alternatives include strength members other than steel (Kevlar)and signal carriers other than conventional copper conductors (fiber optics). The final section - Conclusions - summarizes the recommendations, based on this study, for improving the reliability of present and future CTD lowering systems.
  • Technical Report
    Observations of near-bottom flow in a wave-dominated nearshore environment
    (Woods Hole Oceanographic Institution, 1994-02) Fredericks, Janet J. ; Trowbridge, John H. ; Agrawal, Yogesh C.
    To provide observational data for analysis of near-bottom, wave-induced flows, a downward-looking laser Doppler velocimeter (LDV) was deployed to profile the near-bed velocity structure of a six meter water column at a site just outside the surfzone off the coast of North Carolina. 90 second "snap-shots" of the velocity at six elevations below 20 cm above bottom were measured at 25 Hz, while pressure was concurrently measured at 126 cm above bottom. The near-bottom data were supplemented with a benthic acoustic stress sensor (BASS) at approximately 20 cm above bottom which concurrently measured velocity components at 10 Hz. The purposes of this report are to document the collection, processing and archival of these data and to present the profiles for evaluation.