Accession Number:

ADA634262

Title:

Experimental and Numerical Studies of Non-Equilibrium Stratified Turbulence Relevant to Oceanic Currents

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF APPLIED MECHANICS AND ENGINEERING SCIENCES

Personal Author(s):

Report Date:

1997-09-30

Pagination or Media Count:

6.0

Abstract:

LONG-TERM GOAL. Our long-term goal is to understand and parametrize the influence of complex shear and stratification patterns observed in the ocean on small-scale transport processes with particular application to coastal flows and fronts SCIENTIFIC OBJECTIVES. The objective of the numerical component of past year s research was to investigate the effect of an additional horizontal shear component on vertically sheared, vertically stratified flow. This study was motivated by observations of intense mixing generated by horizontal shear in tidal convergence fronts 1, shallow seamounts 2 and sidewalls of channels. In addition, quantitative comparisons with same initial spectra were conducted between the laboratory and numerical results of vertically sheared, vertically stratified flow for mutual validation. The main objective of the experimental component was to design and build a rapid vertical traversing system in order to make measurements using the same type of sampling most often employed in ocean measurements. The basic anisotropy of turbulence in stably stratified flows demands that such measurements be made and compared with those made in the ocean with vertical profilers. Our current student, Kurt Keller, was courageous enough to attempt such laboratory measurements. We hope to be able to use our results to assess and evaluate the many ocean microstructure measurements that are made in this way. Perhaps we can eventually shed some light using our experimental and numerical results on the large disparity in measured dissipation rates as estimated from large scale balances versus microstructure measurements .

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE