Dissipation Effects of Coastal Vegetation on Nearshore Structures under Wave Runup Loading
Publication: Journal of Structural Engineering
Volume 147, Issue 3
Abstract
Inundation events caused by hurricanes or tsunamis pose a substantial risk to the integrity of coastal infrastructure; however, their impact on the built environment can be greatly altered by natural and anthropogenic obstacles or disturbances to the flow, such as vegetation or neighboring structures. This paper investigates the impact of coastal vegetation on shoreline structural vulnerability due to wave runup loading. Using numerical simulation data, the load (base shear) and momentum flux are computed as a function of vegetation characteristics (length and density) for different excitation intensities (wave heights) at the location of a shoreline structure. This information is then used to estimate structural fragility. Motivated by recent reconnaissance data from Hurricane Matthew in 2016, emphasis is placed on the out-of-plane failure of infill masonry walls. Extension to a different structural typology, that of a reinforced concrete frame, is also discussed. Comparisons between different vegetation characteristics and the bare-earth case demonstrate the wave dissipation and reduction of structural fragility (and therefore ultimately vulnerability) achieved when vegetation is present for the investigated case-study structures.
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Data Availability Statement
Some data used during the study were provided by a third party [fragility function details from Alam et al. (2017)]. Direct requests for these materials may be made to the provider as indicated in the Acknowledgments. Some other data generated or used during the study are available from the corresponding author by request (regression surfaces shown in Fig. 2). Remaining models and code used during the study appear in the published article.
Acknowledgments
This work was funded by the National Institute of Standards and Technology and by the National Science Foundation under Grant Nos. CMMI 17-09357 and CMMI-17-27662. This support is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the funding agencies. Authors would also like to thank the authors of the paper by Alam et al. (2017) for providing the fragility curve data used in the second case study.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 3 • March 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Sep 27, 2019
Accepted: Sep 1, 2020
Published online: Dec 16, 2020
Published in print: Mar 1, 2021
Discussion open until: May 16, 2021
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