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Methods of substructuring in lake circulation dynamics

Wang, Yongqi and Hutter, Kolumban (2000):
Methods of substructuring in lake circulation dynamics.
In: Advances in Water Resources, Elsevier Science, pp. 399-425, 23, (4), ISSN 0309-1708,
DOI: 10.1016/S0309-1708(99)00024-X,
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S0309170899...],
[Article]

Abstract

A semi-implicit semi-spectral hydrodynamic primitive equation model is used in combination with a substructuring technique to study wind-induced motions and tracer diffusion in the homogeneous and stratified Lake Constance. An impulsively applied spatially uniform wind is applied in the long direction of the lake (305° from True North) lasting indefinitely. Tracer mass is released at various locations of the free surface over a finite area for 24 h starting together with the imposed wind. We compute for a given wind and tracer scenario the flow and concentration fields for the entire lake using a coarse grid resolution. Within three different subregions, where improvements of the obtained results are sought, computations are repeated by using a finer grid and employing the results of the global computations at the open boundaries of the subregion. We demonstrate that this substructuring technique can be used: (i) to improve results where subgrid processes are significant as e.g., near shore, at early times in the neighbourhood of tracer sources and in complex geometric areas (bays); (ii) to better resolve and graphically display velocity and tracer concentration distributions on larger scales. We employ the technique for the homogeneous and the stratified Lake Constance. The technique is seen to be an economically efficient procedure in improving computational results when implementation of fine resolutions is not feasible.

Item Type: Article
Erschienen: 2000
Creators: Wang, Yongqi and Hutter, Kolumban
Title: Methods of substructuring in lake circulation dynamics
Language: English
Abstract:

A semi-implicit semi-spectral hydrodynamic primitive equation model is used in combination with a substructuring technique to study wind-induced motions and tracer diffusion in the homogeneous and stratified Lake Constance. An impulsively applied spatially uniform wind is applied in the long direction of the lake (305° from True North) lasting indefinitely. Tracer mass is released at various locations of the free surface over a finite area for 24 h starting together with the imposed wind. We compute for a given wind and tracer scenario the flow and concentration fields for the entire lake using a coarse grid resolution. Within three different subregions, where improvements of the obtained results are sought, computations are repeated by using a finer grid and employing the results of the global computations at the open boundaries of the subregion. We demonstrate that this substructuring technique can be used: (i) to improve results where subgrid processes are significant as e.g., near shore, at early times in the neighbourhood of tracer sources and in complex geometric areas (bays); (ii) to better resolve and graphically display velocity and tracer concentration distributions on larger scales. We employ the technique for the homogeneous and the stratified Lake Constance. The technique is seen to be an economically efficient procedure in improving computational results when implementation of fine resolutions is not feasible.

Journal or Publication Title: Advances in Water Resources
Volume: 23
Number: 4
Publisher: Elsevier Science
Uncontrolled Keywords: Substructuring; Lake circulation; Tracer diffusion; Limnology
Divisions: Study Areas
16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
Study Areas > Study Area Mechanic
Date Deposited: 30 Aug 2011 14:37
DOI: 10.1016/S0309-1708(99)00024-X
Official URL: http://www.sciencedirect.com/science/article/pii/S0309170899...
Additional Information:

DOI: 10.1016/S0309-1708(99)00024-X

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