Practical Comparison of One-Dimensional and Two-Dimensional Hydraulic Analyses for Bridge Scour

by M. A. Ports, Parsons Brinckerhoff, Baltimore, United States,
T. G. Turner, Parsons Brinckerhoff, Baltimore, United States,
D. C. Froehlich, Parsons Brinckerhoff, Baltimore, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The Kentucky Transportation Cabinet, Department of Highways is working with the Indiana Department of Transportation and the Federal Highway Administration to plan, design, and construct a new bridge over the Ohio River near Owensboro, Kentucky. The proposed project involves the design and construction of a new four lane bridge and roadway approaches over the Ohio River between Owensboro in Davies County, Kentucky and Rockport in Spencer County, Indiana. As shown in Figure 1, the proposed project crosses the Ohio River floodplain at one of its widest points. The width f the floodplain exceeds four miles. The overbank areas are nearly level and generally characterized by numerous swells and swales and ephemeral streams aligned parallel to the main river channel. During the conceptual and early preliminary phases, the potential scour was estimated based upon a conventional hydraulic evaluation using WSPRO. The Kentucky Department of Highways determined, however, that a two-dimensional hydraulic analysis, using FESWMS, was required for successful design of the proposed bridge and approach roadways constricting the natural flood plain. This paper compares the hydraulic analysis of the proposed bridge over the Ohio River and approach roadways across the flood plain using one-dimensional model, WSPRO, to the two-dimensional model, FESWMS.



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