Risk of shoreline hardening and associated beach loss peaks before mid-century: Oʻahu, Hawaiʻi

Tavares, Kammie-Dominique; Fletcher, Charles H.; Anderson, Tiffany R.

doi:10.1038/s41598-020-70577-y

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Risk of shoreline hardening and associated beach loss peaks before mid-century: Oʻahu, Hawaiʻi

2020
By Tavares, Kammie-Dominique ; Fletcher, Charles H. ; Anderson, Tiffany R.
Source: Sci Rep. 2020 Aug 12;10(1):13633.

[PDF-1.40 MB]

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Journal Title:

Scientific Reports
Personal Author:

Tavares, Kammie-Dominique ; Fletcher, Charles H. ; Anderson, Tiffany R.

Tavares, Kammie-Dominique ; Fletcher, Charles H. ; Anderson, Tiffany R. Less -
NOAA Program & Office:

NOS (National Ocean Service) ; OCM (Office for Coastal Management)

NOS (National Ocean Service) ; OCM (Office for Coastal Management) Less -
Description:

Shoreline hardening, which causes beach loss globally, will accelerate with sea level rise (SLR), causing more beach loss if management practices are not changed. To improve beach conservation efforts, current and future shoreline hardening patterns on sandy beaches need deeper analysis. A shoreline change model driven by incremental SLR (0.25, 0.46, 0.74 m) is used to simulate future changes in the position of an administrative hazard zone, as a proxy for risk of hardening at all sandy beaches on the island of O'ahu, Hawai 'i. In Hawai 'i, hardening can be triggered when evidence of erosion is within 6.1 m ("20 ft") of certain structures, allowing an applicant to request emergency protection. Results show an increase in shoreline vulnerability to hardening with SLR governed by backshore land use patterns. The largest increase (+ 7.6%) occurred between modern-day and 0.25 m of SLR (very likely by year 2050) with half of all beachfront shoreline at risk by 0.74 m of SLR. Maximum risk of shoreline hardening and beach loss is projected to occur from modern-day and near-term hardening because of the heavily developed aspect of some shoreline segments. Adaptation to SLR should be considered an immediate need-not solely a future issue.
Keywords:

[+]

Sea Level Rise Shorelines
Source:

Sci Rep. 2020 Aug 12;10(1):13633.
DOI:

https://dx.doi.org/10.1038/s41598-020-70577-y
Pubmed ID:

32788626
Pubmed Central ID:

PMC7424522
Document Type:

Journal Article
Funding:

Grant no. NA17NOS4190171
Place as Subject:

Hawaii
Rights Information:

CC BY
Compliance:

PMC
Main Document Checksum:

[+]

urn:sha256:6cbe291ea6d54b438142b21c528335179a3c73a562c2a45fa0529ecb6c2f568a
Download URL:

https://repository.library.noaa.gov/view/noaa/27530/noaa_27530_DS1.pdf
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Risk of shoreline hardening and associated beach loss peaks before mid-century: Oʻahu, Hawaiʻi

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