Migration of Tidal Sand Waves in Chesapeake Bay Entrance.
OLD DOMINION UNIV NORFOLK VA INST OF OCEANOGRAPHY
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Subtidal sand waves occur atop shoals and on shoal margins in the northern part of the tidal entrance to Chesapeake Bay, Virginia. Wavelength ranges from 200-800 ft height ranges from 5-11 ft. All major slopes are 2-3 degrees, far less than the angle of repose of the constituent sediment. In flood-dominated tidal channels, sand waves are asymmetrical and face landwards in ebb-dominated tidal channels and atop most banks, sand waves face seawards. Where near-bottom flood and ebb tidal currents are equal in time-velocity impulse, sand waves of symmetrical trochoidal profile are developed. Data from 21 successive echo-sounding profiles taken over a 17-month period show that the seaward-facing asymmetrical sand waves range from 115 to 492 ftyear. Author
- Physical and Dynamic Oceanography