Evaluation of Bridge Scour Research: Geomorphic Processes and Predictions

Abstract

This report explores the impact of long-term aggradation and degradation, and lateral river channel migration, on highway structures. The scope and objectives of this research were to evaluate recent geomorphic research in comparison to existing methods for predicting channel instability. The research team focused on long-term aggradation and degradation and on lateral channel migration. Although these are reach-scale processes (not local to the pier or abutment or limited to vicinity of the bridge opening), the focus was on how these processes impact highway structures. Therefore, the methods described in this report are practical for use by bridge designers and design consultants.