Pade Bert H.-G.

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Pade
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Bert H.-G.
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  • Technical Report
    Water velocity measurement from near surface to 110 m depth at deepwater dumpsite #106 using acoustically tracked drogues and conventional current meters
    (Woods Hole Oceanographic Institution, 1981-02) Churchill, James H. ; Pade, Bert H.-G. ; Peal, Kenneth R.
    A system has been developed recently at W.H.O.I. for tracking nearsurface drogues equipped with sonobuoys using an acoustic navigation system. Surface and submerged drogues of mean depths ranging from 0.15 m to 4.88 m were tracked in the vicinity of deepwater dumpsite #106 . A least squares linear regression technique was used to determine drogue velocities over 2 hour periods. Water velocities at depths from 8 - 110 m were measured using a ship-deployed current meter coupled with acoustic tracking of the ship. The results indicated very little velocity shear in the surface mixed layer. There were two regions of _strong shear at greater depths, one associated with the main thermocline and the other presumably associated with a halocline .
  • Technical Report
    Acoustically and visually tracked drogue measurements of nearsurface water velocities in Lake Huron, plus observations of a coastal upwelling
    (Woods Hole Oceanographic Institution, 1981-10) Churchill, James H. ; Pade, Bert H.-G.
    During July and August of 1980 our research group measured nearsurface water velocities near the eastern coast of Lake Huron by tracking drogues using acoustic travel time and compass sighting techniques. The velocity fields appeared to consist of two components. These have been termed: a sub-current, which varied slowly with depth (compared to the deepest drogue depth of 5.2 m) and, in most cases, was apparently in geostrophic balance with the cross shore pressure gradient; and, a surface layer-current (defined by the relative velocity from deeper to shallower drogues) which decayed rapidly with depth and was directed nearly parallel with the wind and waves. There was no discernable relationship between wind speed and relative velocity. There was, however, a direct dependence of relative velocity with estimated surface roughness, suggesting that Stokes drift may have been primarily responsible for the shear. The magnitudes of the observed relative velocities were approximately equal to Stokes drift magnitudes calculated from representative wave energy spectra. Also reported are measurements of current and temperature structure made prior to and following a coastal upwelling.
  • Technical Report
    Measurement of nearsurface current in Cape Cod Bay using sighted drogues
    (Woods Hole Oceanographic Institution, 1980-01) Churchill, James H. ; Pade, Bert H.-G.
    During July 16-19, 1979 currents in Cape Cod Bay from the very near surface to 1.8 m were measured by taking simultaneous bearings on submerged drogues from two anchored vessels. The error in drogue position as a function of location with respect to the two vessels was examined in detail and was used for rejecting or accepting velocities from particular sightings. From the final results well defined velocity shears, nearly parallel with the wind, were evident. From these velocity fields surface stress coefficients, equivalent sand-grain roughness coefficients, and the near surface gradients of relative (to the surface velocity) velocity were calculated.