United States Department of Transportation
i
A Primer on Coastal Transportation System Resilience and Adaptation to Sea Level Rise on Oahu Using Living Shorelines and Green Infrastructure
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2018-12-01
[PDF-6.38 MB]
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Abstract:O‘ahu, Hawai‘i’s coastal hazards include accelerating erosion, sea level rise, and coastal storms that threaten to flood roadways and new rail infrastructure. Typical “hard” shoreline armoring for coastal protection results in detrimental erosion; this report presents alternatives, such as living shorelines and green infrastructure. When planning long term infrastructure for 3.2 feet of sea level rise by mid-century, the goal of living shorelines is to slow coastal erosion and reduce flooding so that coastal transportation ways may remain operational during the coming decades. This primer provides a literature review, project precedents, and design ideas for living shorelines and green infrastructure at three coastal sites on O‘ahu. The study sites, analysis, and design methods serve as prototypes for high, medium, and low wave energy sites for reference by policy makers and future design teams. The study site locations on O‘ahu are Sunset Beach, Waikiki Beach, and Waipahu Transit Oriented Development Area. At each site, potential living shorelines and green infrastructure strategies are evaluated based on the strategies’ function and effectiveness, quantitatively where possible. The international project precedents include built and unbuilt living shorelines and green infrastructure projects, often emphasizing their multiple uses and shared benefits. The design ideas at each study site integrate the potential living shoreline and green infrastructure strategies at a conceptual design level, communicated through drawings and physical models. The primer also demonstrates how student learning and multi-disciplinary collaboration enhance applied research.
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