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Sheet Flow Resistance of Asphaltic Pavements

by Joseph R. Reed, Pennsylvania State Univ, University Park, United States,
John C. Warner, Pennsylvania State Univ, University Park, United States,
Richard S. Huebner, Pennsylvania State Univ, University Park, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

A statistical study has been conducted by the authors using 400 points of experimental data taken in the 1970's at Texas A&M for sheet flow runoff during artificial rainfall on four asphalt pavement surfaces with different mean texture depths (MTD). The purpose was to define Manning's n as the resistance variable for dense graded asphaltic concrete. The resulting regression equation of the 400 data points was algebraically merged with the kinematic wave equation in order to define Manning's n. Subsequent analysis of the merger resulted in an inverse relationship between Manning's n and the Reynold's number (R_c) to an exponent less than 1. Also, a statistical study confirmed that the datum for flow of these thin films was one MTD below the tops of the roughness asperities.

Subject Headings: Sheet flow | Asphalt pavements | Flow resistance | Pavement surface roughness | Kinematic waves | Wave equations | Sheets

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