Presentation Abstract

Increasing coastal development makes it vitally important to understand the shoreline’s response to anthropogenic modifications. We compared physical beach characteristics from adjacent sections of armored and unarmored shoreline at a variety of locations in the Salish Sea in order to assess the effects of armoring on beach morphology. Ten reaches, each a minimum of 500 meters in length, were selected from locations sampled with boat-based LiDAR collected by the Washington Department of Ecology Coastal Monitoring & Analysis Program. Cross-shore profiles were generated for each reach at 10-meter intervals alongshore. On each profile, estimates of beach slope, width, and toe elevation were extracted from the LiDAR in both the foreshore and backshore zones. Each parameter was tested for significant differences between the armored and unarmored sections. Alongshore patterns in these parameters were also observed in order to evaluate gradients in the alongshore effects of armoring. Lastly, the relationship between bluff or armor toe elevation and beach width and slope was tested. Findings from this research will provide insights about nearshore morphodynamics in the Salish Sea, and aid in prioritizing and evaluating armor removal restoration efforts.

Session Title

Track: Shorelines, Estuaries & Rivers – Posters

Conference Track

Shorelines, Estuaries & Rivers

Conference Name

Salish Sea Ecosystem Conference (2020 : Online)

Document Type

Event

SSEC Identifier

2020_abstractID_5583

Start Date

21-4-2020 9:00 AM

End Date

22-4-2020 4:45 PM

Geographic Coverage

Salish Sea (B.C. and Wash.)

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.

Language

English

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Apr 21st, 9:00 AM Apr 22nd, 4:45 PM

Effects of Shoreline Armoring on Physical Beach Characteristics in the Salish Sea, WA

Increasing coastal development makes it vitally important to understand the shoreline’s response to anthropogenic modifications. We compared physical beach characteristics from adjacent sections of armored and unarmored shoreline at a variety of locations in the Salish Sea in order to assess the effects of armoring on beach morphology. Ten reaches, each a minimum of 500 meters in length, were selected from locations sampled with boat-based LiDAR collected by the Washington Department of Ecology Coastal Monitoring & Analysis Program. Cross-shore profiles were generated for each reach at 10-meter intervals alongshore. On each profile, estimates of beach slope, width, and toe elevation were extracted from the LiDAR in both the foreshore and backshore zones. Each parameter was tested for significant differences between the armored and unarmored sections. Alongshore patterns in these parameters were also observed in order to evaluate gradients in the alongshore effects of armoring. Lastly, the relationship between bluff or armor toe elevation and beach width and slope was tested. Findings from this research will provide insights about nearshore morphodynamics in the Salish Sea, and aid in prioritizing and evaluating armor removal restoration efforts.