Abstract

Landscape-scale changes in hydrology, sediment dynamics, and riverine ecosystems are raising questions about how resilience to changing conditions should be integrated in the design of river restoration projects. This study synthesized current strategies and challenges for river restoration in systems governed by change, emphasizing (1) an international survey of practitioners to document the state-of-the-practice, including challenges facing practitioners implementing river restoration and (2) a literature review of the state of the art in designing for resiliency, including advantages and limitations of established and more-experimental design approaches and tools. Survey results highlighted fundamental challenges associated with identifying appropriate project objectives within a design practice largely relying on historical data, the significance of social and regulatory barriers, and the need to focus on underlying processes. Important discrepancies between the expectations for resiliency of projects and the practices being implemented emerged. The state-of-the-art literature review summarized how design strategies may be modified to address those discrepancies, and discussed the divergent approaches for increasing resilience through (1) increasing resistance to change (i.e., stabilization) and (2) restoration of a channel’s dynamism to reduce the risk of, and recovery time following, disturbances. Both the state of the practice and the state of the art highlight the lack of resiliency within the practice of river restoration itself, and illustrate the importance of designers, funders, regulators, and stakeholders adapting and innovating as the natural and human landscape they are managing changes.

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Data Availability Statement

Some or all data, models, or code generated or used during the study are available in a repository or online in accordance with funder data retention policies (https://doi.org/10.7267/9306t504m).

Acknowledgments

We gratefully acknowledge all of the survey respondents for their time in providing insight on the state of the practice, and the ASCE Environmental Water Resources Institute for travel support.

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Journal of Hydraulic Engineering
Volume 147Issue 3March 2021

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Published online: Jan 11, 2021
Published in print: Mar 1, 2021
Discussion open until: Jun 11, 2021

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Desiree Tullos, Ph.D., M.ASCE [email protected]
P.E.
Dept. of Biological and Ecological Engineering, Oregon State Univ., Corvallis, OR 97330 (corresponding author). Email: [email protected]
Daniel W. Baker, Ph.D. [email protected]
P.E.
Dept. of Civil and Environmental Engineering, Colorado State Univ., Corvallis, OR 97330. Email: [email protected]
Joanna Crowe Curran, Ph.D., A.M.ASCE [email protected]
P.E.
Adjunct Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996. Email: [email protected]
Michael Schwar, Ph.D., M.ASCE [email protected]
P.E.
Principal Water Resources Engineer, Stony Point Hydrology, P.O. Box 123, Waukesha WI 53187. Email: [email protected]
John Schwartz, Ph.D., M.ASCE [email protected]
Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996. Email: [email protected]

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