A Modeling Framework for Evaluating Streambank Stabilization Practices for Reach-Scale Sediment Reduction

Abstract. Streambank stabilization techniques are often implemented to reduce sediment loads from unstable streambanks. Process-based models can predict sediment yields with stabilization scenarios prior to implementation. However, a framework does not exist on how to effectively utilize these models to evaluate stabilization measures; instead, many projects rely on empirical approaches that fail to quantify stream-scale impacts. The objective was to develop a framework to evaluate streambank stabilization practices using process-based hydraulic/sediment transport models, public and landowner perception, construction costs, and effectiveness. This framework produces a set of sediment reduction graphs to determine the stabilization length and a second set of graphs to determine the cost. The methodology was applied to Fivemile Creek, located in western Oklahoma. A CONCEPTS simulation was developed for a 10.25-km reach and several stabilization techniques (grade control, riprap toe, and vegetation) were simulated. Vegetation with 2:1 bank slopes was determined to be the most cost-effective stabilization practice.