Use of upscaled elevation and surface roughness data in two-dimensional surface water models

Advances in Water Resources
By: , and 

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Abstract

In this paper, we present an approach that uses a combination of cell-block- and cell-face-averaging of high-resolution cell elevation and roughness data to upscale hydraulic parameters and accurately simulate surface water flow in relatively low-resolution numerical models. The method developed allows channelized features that preferentially connect large-scale grid cells at cell interfaces to be represented in models where these features are significantly smaller than the selected grid size. The developed upscaling approach has been implemented in a two-dimensional finite difference model that solves a diffusive wave approximation of the depth-integrated shallow surface water equations using preconditioned Newton–Krylov methods. Computational results are presented to show the effectiveness of the mixed cell-block and cell-face averaging upscaling approach in maintaining model accuracy, reducing model run-times, and how decreased grid resolution affects errors. Application examples demonstrate that sub-grid roughness coefficient variations have a larger effect on simulated error than sub-grid elevation variations.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Use of upscaled elevation and surface roughness data in two-dimensional surface water models
Series title Advances in Water Resources
DOI 10.1016/j.advwatres.2011.02.004
Volume 34
Issue 9
Year Published 2011
Language English
Publisher Elsevier
Publisher location Amsterdam, The Netherlands
Contributing office(s) Florida Water Science Center
Description 14 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Advances in Water Resources
First page 1151
Last page 1164
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