Case Study in Cost-Based Risk Assessment for Selecting a Stream Restoration Design Method for a Channel Relocation Project

摘要: A low-risk, stream restoration design includes methods that validate assumptions, incorporate uncertainty in the decision-making process during project phase, and reduce by checking final design. two-step method of incorporating risk has been developed as a combination failure modes effects analysis (DFMEA) quantification. As first step, DFMEA is applied to identify terms ratings with respect consequence failure, likelihood occurrence ability detect failure. Due its evolutionary nature, can be revised account for modifications relative are reevaluated examine reductions uncertainty, thereby, risk. The second step quantifying using initial expected costs. two-step, risk-based illustrated through application relocation Pennsylvania. Both sediment transport capacity supply alluvial channel modeling were shown detecting deficiencies incipient motion tests overlooked. However, model was favored due simulate combined flow hydraulics, transport, river adjustment.