Optimal Cross-Sectional Spacing in Preissmann Scheme 1D Hydrodynamic Models
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 2
Abstract
Choosing a suitable set of cross sections for the representation of the natural geometry of a river is important for the efficiency of one-dimensional (1D) hydraulic models, but only few guidelines are available for the selection of the most suitable distance between cross sections, depending on the hydraulic problem at hand. This issue is investigated by examining models of a reach of the River Po, Italy, and a reach of the River Severn, United Kingdom, for both of which high quality laser scanning altimetry are available. The high-resolution digital terrain models of the two river reaches enabled the construction of a series of hypothetical topographical ground surveys with different spacing between cross sections, which could be used as input to a standard 1D model (UNET). Both historical and synthetic flood events for the two river reaches were simulated, and the results were then analyzed to quantify the accuracy associated with each resolution and to assess how survey resolution impacts the performance of standard 1D models. The study results agree with the available suggestions in the literature and provide useful guidelines for 1D hydrodynamic modeling.
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Acknowledgments
The writers are extremely grateful to the Interregional Agency for the Po River (Agenzia Interregionale per il Fiume Po, AIPO, Italy) and Po River Basin Authority (Autorità di Bacino del Fiume Po, Italy) and Environment Agency of England and Wales allowing access to their high resolution DTMs of rivers Po and Severn. The writers also wish to thank Dennis A. Lyn, Paul G. Samuels, and Matt Horritt for their valuable indications and comments. Four unknown reviewers and the associate editor are acknowledged for their useful and constructive reviews. The preliminary analysis performed by Simone Castiglioni and Mara Montanari is also acknowledged.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 2 • February 2009
Pages: 96 - 105
Copyright
© 2009 ASCE.
History
Received: Jul 10, 2007
Accepted: Jun 25, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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