Accession Number:

ADA537211

Title:

Barrier Island Restoration for Storm Damage Reduction: Willapa Bay, Washington, USA

Descriptive Note:

Conference paper

Corporate Author:

CORPS OF ENGINEERS SEATTLE WA SEATTLE DISTRICT

Report Date:

2010-07-01

Pagination or Media Count:

14.0

Abstract:

The U.S. Army Corps of Engineers, Seattle District has completed a feasibility study and determined barrier island restoration to be the most appropriate long-term coastal flood and storm damage reduction measure for the Shoalwater Indian Reservation. Over the last century, Cape Shoalwater has receded more than 2.8 miles. By 1990, the Shoalwater Reservations only remaining protection from storm wave attack was a series of barrier islands fronting Tokeland Peninsula. Extreme water levels coincident with strong winter storms have historically inundated this low lying topography and are responsible for the erosion and overwash of the protective barrier island known as Graveyard Spit. Here a simple risk assessment tool is presented for identifying flood risk to the Shoalwater Reservation infrastructure. Statistical analysis of extreme water levels and numerical modeling is utilized to determine the extent of inundation. From the analysis it was determined 54 of the inventoried infrastructure is at risk during a storm event equivalent to the observed event on March 3, 1999. With the barrier island restoration it was found that this risk is reduced to 7.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE