Diffusion Wave Model for Simulating Storm-Water Runoff on Highway Pavement Surfaces at Superelevation Transition
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 10
Abstract
On a curved section of highway, the cross slope of the road is often designed to be superelevated to balance the centrifugal force and gravity applied on vehicles. The accumulation of storm-water runoff (sheet flow) near superelevation transitions may significantly increase due to the extended flow path and converging flow lines. A two-dimensional finite-volume-based diffusion wave model is developed to simulate the sheet flow on these geometrically complex surfaces. Both Dirichlet- and Neumann-type boundary conditions are developed for open boundaries based on kinematic wave theory. Results show that the distribution of sheet flow is closely related to the cross slope, longitudinal slope, rainfall intensity, and the width of the road. The analysis of sheet flow characteristics on superelevation transition areas suggests that the optimal longitudinal slope in the range of 0.3–0.4% minimizes the depth of storm-water runoff on the road surface.
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Acknowledgments
We wish to acknowledge the support received for this research effort from the Texas Department of Transportation, funded through the Center for Transportation Research at The University of Texas at Austin.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 10 • October 2010
Pages: 770 - 778
Copyright
© 2010 ASCE.
History
Received: May 3, 2009
Accepted: Apr 19, 2010
Published online: Apr 21, 2010
Published in print: Oct 2010
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