Coupling a Bottom Boundary Layer in the Generalized Terrain-Following
Coordinate System
Y. Tony Song and Yi Chao
Jet Propulsion Laboratory, California Institute of Technology
Pasadena, California 91109
A wave-enhanced Bottom Boundary Layer (BBL) scheme is incorporated into
the generalized terrain-following coordinate system. The method is based
on the combined techniques of the generalized vertical coordinate system
Kasahara (1974), the general pressure gradient formulation of Song (1998),
and the embedded BBL scheme of Song and Chao (2000).
A suite of process-oriented test problems will be used to evaluate the
accuracy and efficiency of the new scheme. A science application with the
coupled eddy-sediment transport in a coastal ocean model will be presented.
The objective of the study is to develop a general vertical coordinate
capability with hybrid Z-, Isopycnal, and Sigma-coordinate features
to better represent the subgridscale mixing and BBL processes.
The developed techniques will be first applied to the ONR-initiated
Expert Modeling System for future ocean nowcast/forecast applications.