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Consultants: Proposed Francis Street dune will cut overwash, need small landside wall
Summary
Woods Hole Group presented coastal erosion and flood-velocity modeling for the Francis Street Beach mitigation project, finding the dune designs reduce overwash and do not generate damaging flow increases, while recommending a short landside wall to limit sand overwash onto Washington Street.
Woods Hole Group coastal modelers reported that the proposed Francis Street Beach dune designs — the “dune swoop” and the “beach overlook” — produce similar erosion outcomes and offer near- and mid-term flood risk reduction while requiring only modest maintenance.
The firm’s summary explained the modeling looked at both sediment movement (how the beach profile changes during storms) and flood redirection/velocity concentration (how the project affects where water flows during storm events). Kirk of Woods Hole Group said the team ran simulations using observed tide-gauge data and regional projections and evaluated storms from present-day 100-year events to future-event scenarios. “We don’t think yet we need to have any kind of internal dune core for this,” Kirk said, “however, we do think you’re gonna probably want some kind of landscape wall to limit sediment overwash.”
Why it matters: The modeling found the proposed dune raises the representative cross-shore profile (crest…
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