Abstract Title

Session S-01G: New Strategies for Shorelines

Keywords

Shorelines

Start Date

30-4-2014 10:30 AM

End Date

30-4-2014 12:00 PM

Description

The Marine Shorelines Design Guidelines (MSDG) report provides a background on the Puget Sound nearshore environment, the values of stewardship, and comprehensive guidance on how to effectively manage and protect Puget Sound shores for the improvement of the larger nearshore ecosystem. Guidance material and design recommendations integrate the results of assessing the relative success of different shoreline design techniques, which was an earlier phase of the larger MSDG project. The design methodology for shore protection includes: detailed guidance on how to perform site and coastal processes assessments, measure cumulative risk, identify appropriate design alternatives for site conditions, avoid and mitigate for negative habitat impacts, and the design process entailed for each of the major marine design techniques. The spectrum of design techniques included a range from passive management approaches that require minimal engineering to soft shore protection to hard armor. No Action alternatives are characteristically more passive approaches that preserve natural processes and have few to no negative impacts on nearshore ecosystem functions, goods, and services. Soft shore protection approaches preserve the natural beach and typically rely only on natural materials (at least above grade). Soft shore approaches include projects in which gravel and sand are added to the beach (beach nourishment), large wood is installed to curb erosion in the backshore, or the bank is regraded and revegetated to reduce bank erosion. Soft shore protection projects commonly include beach nourishment that can benefit drift cells and shoreforms where natural sediment supply has been reduced, such as drift cells with considerable armored feeder bluffs. Hard armor design techniques using rock revetments and vertical bulkheads, which are designed to preclude shoreline migration and bank erosion, are included. Each type of approach has varying degrees of impact with the no action alternatives resulting in the least impact and hard armor having the greatest impact.

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Apr 30th, 10:30 AM Apr 30th, 12:00 PM

Marine Shoreline Design Guidelines – Phase 2 Analysis and Applications

Room 6E

The Marine Shorelines Design Guidelines (MSDG) report provides a background on the Puget Sound nearshore environment, the values of stewardship, and comprehensive guidance on how to effectively manage and protect Puget Sound shores for the improvement of the larger nearshore ecosystem. Guidance material and design recommendations integrate the results of assessing the relative success of different shoreline design techniques, which was an earlier phase of the larger MSDG project. The design methodology for shore protection includes: detailed guidance on how to perform site and coastal processes assessments, measure cumulative risk, identify appropriate design alternatives for site conditions, avoid and mitigate for negative habitat impacts, and the design process entailed for each of the major marine design techniques. The spectrum of design techniques included a range from passive management approaches that require minimal engineering to soft shore protection to hard armor. No Action alternatives are characteristically more passive approaches that preserve natural processes and have few to no negative impacts on nearshore ecosystem functions, goods, and services. Soft shore protection approaches preserve the natural beach and typically rely only on natural materials (at least above grade). Soft shore approaches include projects in which gravel and sand are added to the beach (beach nourishment), large wood is installed to curb erosion in the backshore, or the bank is regraded and revegetated to reduce bank erosion. Soft shore protection projects commonly include beach nourishment that can benefit drift cells and shoreforms where natural sediment supply has been reduced, such as drift cells with considerable armored feeder bluffs. Hard armor design techniques using rock revetments and vertical bulkheads, which are designed to preclude shoreline migration and bank erosion, are included. Each type of approach has varying degrees of impact with the no action alternatives resulting in the least impact and hard armor having the greatest impact.