A numerical drainage model to simulate infiltration into porous pavements for higher road safety
An ideal drainage of road pavements is essential to ensure road safety and to reduce aquaplaning risks; also damages to the road surface geometry ought to be prevented. A profound knowledge of the water absorbing properties of porous asphalt layers implicates the possibility to predict the water runoff capacities and the emerging water film thicknesses especially for critical areas with changing cross slopes as well as the optimal sizing of drainage facilities.
Goal of the research and the presented mathematical modelling is the identification of the relevant infiltration parameters based on the special pore structures in the porous pavement layer and hereby the development of a three-dimensional description of the coupling between the free flow on the surface and the drainage process into the porous geometry and the implementation of appropriate conditions on the present hydrodynamic interface. The macroscopic numerical model provides saturations and Darcy velocities and can be linked to results from microscopic simulations based on real asphalt geometries via computer tomographic scans. Different pore size distributions and structural modifications such as soiling processes can be considered.
Keywords: reducing aquaplaning risks, permeable pavements, 3D infiltration model, Darcy velocities and saturations in the porous medium, coupling concept by the Beavers-Joseph-Saffman interface condition
KeywordsPorous Medium Relative Permeability Representative Elementary Volume Road Surface Darcy Velocity
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