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The US Federal Highway Administration (FHWA) is developing the next-generation scour programme – that is, NextScour – to improve scour analysis for safe and economical bridge foundation design. NextScour recognises that scour phenomena consist of two major components: (a) water and hydraulic forces and (b) erosion resistance of soils and their associated geotechnical effects. Consequently, the programme consists of two focus areas: NextScour-Hydraulic and NextScour-Geotechnical. NextScour seeks to research and develop a design tool that computes hydraulic loads across the bathymetric domain. When linked to geotechnically derived subsurface erosion maps/stratigraphy and information of NextScour, the design tool produces instantaneous three-dimensional scour bathymetries around all bridge foundation elements. A bridge replacement project from the Virginia Department of Transportation provided an excellent case study of the potential cost saving by considering NextScour proof-of-concept results in the design process. The J. Sterling Jones Hydraulics Research Laboratory erosion tests determined the erosion resistance of the clay layer at the bridge foundation, and a hydraulic force depth decay function was developed along with the soil depth. The proof-of-concept analysis showed a potential reduced pier scour estimate by 15.7 feet (ft) (4.8 m) and contraction scour estimate by 16.4 ft (5.0 m), 44 and 65% reductions from the original scour analysis, respectively. NextScour empowers FHWA’s future scour analysis with the goal to improve significantly the accuracy of bridge scour estimates.

NextScour for improving bridge scour design in the United States