Dam Break in Channels with 90° Bend
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 11
Abstract
In practice, dam-break modeling is generally performed using a one-dimensional (1D) approach for its limited requirements in data and computation. However, for valleys with multiple sharp bends, such a 1D model may fail for predicting as well the maximum water level as the wave arrival time. This paper presents an experimental study of a dam-break flow in an initially dry channel with a 90° bend, with refined measurements of water level and velocity field. The measured data are compared to some numerical results computed with finite-volume schemes associated with Roe-type flux calculation. The 1D approach reveals the expected limits, while a full two-dimensional (2D) approach provides fine level prediction and rather satisfactory information about the arrival time. A hybrid approach is now proposed, mixing the 1D model for the straight reaches and local 2D models for the bends. The compatibility of the Roe fluxes at the interfaces requires a careful formulation, but the resulting scheme seems able to capture reflection and diffraction processes in such a way that the results are really good in what concerns the water level.
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Information
Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 11 • November 2002
Pages: 956 - 968
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jul 18, 2001
Accepted: Feb 26, 2002
Published online: Oct 15, 2002
Published in print: Nov 2002
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