IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Inferring channel bed topography from known free surface data
Inferring channel bed topography from known free surface data
Author : A. F. Gessese1,3, M. Sellier1, E. Van Houten1 and G. Smart2
The knowledge of bed topography is important to study the hydrodynamics of open channel flows, fluvial hydraulics, or flood propagation to name but a few. Known channel bed topography allows one to computationally predict the free surface profile in different flow scenarios and predict critical quantities such as flood coverage. The direct measurement of the bed topography is a timeconsuming and costly activity. This motivates the present work which proposes two algorithms which can reconstruct the bed topography from a known free surface elevation profile. We show that this inverse problem is governed by a differential equation which is only a slight modification of the standard shallow water equation. Hence, the inverse problem can be solved in "one shot" by solving this differential equation numerically. We also show that a one dimensional riverbed can be reconstructed using a pseudo analytical approach. These reconstruction strategies are successfully tested on a set of experimental data.
File Size : 212,422 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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