Coupling an Underflow Model to a Three-Dimensional Hydrodynamic Model
Publication: Journal of Hydraulic Engineering
Volume 129, Issue 10
Abstract
A separate underflow model is coupled to the three-dimensional (3D) estuary and lake computer model. The underflow equations are solved on a two-dimensional (2D) grid underlying the 3D model grid. The underflow model entrains ambient water whose properties are given by the fluid properties of the bottom boundary cells in the 3D model. This new approach allows improved representation of underflow effects in z-coordinate models by reducing numerical convective entrainment. An idealized case is used to illustrate the benefits of the underflow model. Comparisons of model results and field data for a saline underflow event in Lake Ogawara and a cold-water underflow in Lake Kinneret demonstrate improved model capability in representing underflow events that are thin compared to the vertical grid scale.
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Published In
Journal of Hydraulic Engineering
Volume 129 • Issue 10 • October 2003
Pages: 748 - 757
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Sep 11, 2001
Accepted: Apr 23, 2003
Published online: Sep 15, 2003
Published in print: Oct 2003
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