Kayak Point Sea Level Rise Study

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Kayak Point Regional Park is located in northern Puget Sound along the eastern shore of Port Susan, Washington, between the mouths of the Snohomish and Stillaguamish Rivers. The southwest-facing beach of the park is eroding, resulting in road damage. Wave overtopping of the site is causing deposition of sediment behind the beach berm.

ESA prepared a site conditions assessment and geomorphic conceptual model to assess the potential response of Kayak Point's sediment system to future sea level rise. For a comprehensive understanding, our team analyzed site conditions, including morphology, wave climate, and tidal regime. Developing a conceptual model that included a sediment budget analysis, ESA incorporated estimates of bluff supply and calculations of longshore sediment transport volumes at Kayak Point. An estimate of the shoreline's response to future sea level rise was prepared using a modified Bruun Rule method, incorporating existing depositional trends. We concluded that erosion rates along the southwest-facing beach will increase under both medium and high sea level rise scenarios, and that the deposition currently taking place along the northwest-facing shore will be reduced under the medium sea level rise scenario and potentially reversed with the high scenario.

ESA's assessment of the potential response of Kayak Point's sediment system to future sea level rise was incorporated into the Kayak Point Regional County Park Renovation Design Plan.

Specialized Services

  • Coastal flood forecasting
  • Geomorphic assessments
  • Sea level rise adaptation studies and vulnerability assessments
  • Sediment transport studies