Accession Number:

AD0734701

Title:

Migration of Tidal Sand Waves in Chesapeake Bay Entrance.

Descriptive Note:

Technical rept.,

Corporate Author:

OLD DOMINION UNIV NORFOLK VA INST OF OCEANOGRAPHY

Personal Author(s):

Report Date:

1971-11-15

Pagination or Media Count:

74.0

Abstract:

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

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE