Accession Number:

ADA609830

Title:

Turbulence Off the Coast of Oregon: A Large-Eddy Simulation Study

Descriptive Note:

Annual rept.

Corporate Author:

OREGON STATE UNIV CORVALLIS COLL OF OCEANIC AND ATMOSPHERIC SCIENCES

Report Date:

2000-09-30

Pagination or Media Count:

6.0

Abstract:

Our long-range research goal is to improve understanding of small-scale mixing processes in the coastal ocean environment and to incorporate the effects of these processes in coastal ocean models. We will increase the accuracy of coastal mesoscale prediction models by adding physically-based approximations to one-dimensional mixing parameterizations. Recent studies of the open ocean upper boundary layer using large-eddy simulation LES methods have demonstrated the value of these models in describing turbulent processes in the ocean. We are now at a point where LES can be applied to a broader range of problems that include the coastal surface and benthic boundary layers. Our objectives in this work are to determine the accuracy of LES models in coastal flow scenarios, examine the role of turbulent mixing in defining boundary layer structure, and apply observations and LES results to understand and improve commonly applied mixing parameterizations e.g. Mellor and Yamada 2.5 model and the K profile parameterization. Specific questions we will address include Are Langmuir cells important in inner- and mid-shelf surface layers How do mixing properties dissipation rates, buoyancy fluxes, surface and bottom boundary layer stresses vary from one location to another Do the M-Y and KPP mixing schemes predict local turbulent processes in the Oregon shelf What is the role of small-scale bathymetry variations vertical scale O1 m, horizontal scale O10 m, especially in the inner shelf What are the fundamental differences in mixing statistics of M-Y, KPP, LES, and microstructure measurements

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE