Accession Number : AD0755735

Title :   Tidal Currents and Zig-Zag Sand Shoals in a Wide Estuary Entrance.

Descriptive Note : Technical rept.,

Corporate Author : OLD DOMINION UNIV NORFOLK VA INST OF OCEANOGRAPHY

Personal Author(s) : Ludwick,John C.

Report Date : 15 JAN 1973

Pagination or Media Count : 112

Abstract : Fourteen 27-hour tidal current stations were occupied in the entrance to Chesapeake Bay in a 40-square mile area of subtidal sand banks and channels where the average water depth is 21 feet. Near the bottom at most stations, flood flow dominates over ebb flow in both peak speed and duration. Velocity profiles from bottom to surface are fitted by a parabolic-shaped velocity defect law from which shear stress at the bed was estimated. With two exceptions, net transport of bed sediment is ebb-directed. Decrease in net sediment transport rate along the path of net motion requires deposition of sediment. Locations of deduced deposition correspond to shoals. Prominent indentations, or sinuses, in the margins of shoals, are strongly dominated by net sediment transport towards the closed end of a channel. (Author)

Descriptors :   (*TIDES, *CHESAPEAKE BAY), (*ESTUARIES, SEDIMENTATION), TRANSPORT PROPERTIES, SAND, FLOODS, FLOWMETERS, VELOCITY, OCEAN CURRENTS

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE