Accession Number:

ADA533116

Title:

Direct Measurements of Reynolds Stresses and Turbulence in the Bottom Boundary Layer

Descriptive Note:

Annual rept.

Corporate Author:

JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2008-09-30

Pagination or Media Count:

7.0

Abstract:

a Measure the Reynolds stresses, velocity profile, vorticity, dissipation, and turbulent spectra in the bottom boundary layer of the coastal ocean using particle imaging velocimetry PIV. The validity of these direct stress measurements is independent of assumptions about the boundary layer structure, turbulent spectra and balance of production and dissipation. b Quantify the temporal variation of turbulent stresses in relation to the oceanographic parameters that represent the local environment, such as waves, currents, vertical density gradient, internal wave regime, and nature of the water-sediment interface. The conclusions will be used to determine the relative importance of different mechanisms which control the velocity profile and the turbulent parameters in the benthic boundary layer of the coastal ocean. c Quantify the spatial variation of the stress in different environments to determine the relationship between point measurements and spatial averages, that are necessary for numerical modeling of coastal currents.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE