Practical resilience metrics for coastal infrastructure features

Abstract

This effort is directed towards improving basic understanding of the resilience of complex systems for the development of practical resilience metrics that quantify the capacity to withstand damages, rapidly recover, and adapt to future change. The resilience metrics are based on practical performance measures of coastal infrastructure. Massive savings could be realized by enhancing the resilience of a system, including infrastructure, networks, and communities through risk reduction and expeditious recovery. Existing metrics do not always lend themselves easily and intuitively to practical applications in effective and efficient manners. The coastal and storm damage reduction, navigation, and environmental missions of the U.S. Army Corps of Engineers (USACE) require consistent, transparent, quantitative metrics with which to understand the resiliency of these complex systems. This report provides a resilience definition that meets a set of requirements with clear relationships to metrics of the relevant abstract notions of reliability and risk. The report also provides metrics that are practical and simplified while capturing all the attribute set in the resilience definition. Recovery models with case studies, and illustrative examples, are also provided. Next steps are defined. The report contributes towards advancing the USACE capabilities in defining, quantifying, and assessing coastal and watershed system resilience. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

Applying resilience concepts to inland river system

“…These four concepts have been adopted as the official definition of resilience for the USACE because of their flexibility in application across business lines and their ability to provide a life-cycle perspective for actions and change over time (USACE 2016). The resilience cycle is derived from relatively recent strides in understanding disaster resilience, where the resilience principles are applied to systems that involve diverse components, including communities, built infrastructure, and the environment (Ayyub 2019;NIST 2019;Hosseini and Barker 2016;Schultz and Smith 2016). Analyzing these diverse components requires a deep understanding of their relationships to each other (e.g., scale, connectivity, dependencies) and their reactions to a disturbance.…”

Role of recovery profile dependency in time‐dependent resilience

“…From a view of practical engineering, this may apply to the main‐shock‐after‐shock sequence, 20 or the sequential tropical cyclones (TCs) 21 . Another real‐world example is that, in terms of the erosion and accretion processes of artificial dunes at coastal areas due to multiple occurrences of storms, the performance schematic of a particular dune segment over time is featured by the load(storm)‐recovery interaction, 22 although the storm occurrence process itself may be reasonably modeled by a Poisson process. The dependency of different recovery processes can also be reflected through the temporal correlation arising from the sequence of remaining functionalities and that between the resources allocated to the recovery processes in the aftermath of different load events.…”