Event Title

Seven years of development and change within 200' of the shore in Puget Sound

Presentation Abstract

The 1971 Washington Shoreline Management Act (SMA) defines "Shorelands" or "shoreland areas" as those lands extending landward for two hundred feet in all directions as measured on a horizontal plane from the ordinary high water mark. We analyzed land use change in the Shorelands of Puget Sound using WDFW’s High Resolution Change Detection project. We identified 2,960 individual change locations that intersected those shorelands. We found 73% of the locations exhibited anthropogenic change, 14% had no real change within the shoreland area, 5% of the locations were landslides, 3% were erroneously mapped as change and the remaining locations fell into other minor categories of changes, some difficult to interpret. The entire study area covered 230 km2 or a 61m wide strip about 3800 km in length. The total change area was about 1.4 km2 or about 0.09% per year. This change area included about 0.4 km2 new impervious surface with about 0.9 km2 of tree removal. While we do not quantify vegetation growth, tree and other vegetation growth likely outpaced loss during this time period. We will provide final statistics and examples of change events as part of this presentation. We believe this presents the first comprehensive Puget Sound wide assessment of change within the “Shorelands” defined by the SMA.

Session Title

Panel: Beyond Armwaving and Anecdotes: Bringing Adaptive Management to Land Use Planning

Conference Track

SSE12: Land-Use, Growth, and Development

Conference Name

Salish Sea Ecosystem Conference (Seattle, WA : 2018)

Document Type

Event

SSEC Identifier

SSE12-494

Start Date

5-4-2018 10:00 AM

End Date

5-4-2018 11:30 AM

Type of Presentation

Oral

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Geographic Coverage

Salish Sea (B.C. and Wash.)

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type

text

Language

English

Format

application/pdf

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Apr 5th, 10:00 AM Apr 5th, 11:30 AM

Seven years of development and change within 200' of the shore in Puget Sound

The 1971 Washington Shoreline Management Act (SMA) defines "Shorelands" or "shoreland areas" as those lands extending landward for two hundred feet in all directions as measured on a horizontal plane from the ordinary high water mark. We analyzed land use change in the Shorelands of Puget Sound using WDFW’s High Resolution Change Detection project. We identified 2,960 individual change locations that intersected those shorelands. We found 73% of the locations exhibited anthropogenic change, 14% had no real change within the shoreland area, 5% of the locations were landslides, 3% were erroneously mapped as change and the remaining locations fell into other minor categories of changes, some difficult to interpret. The entire study area covered 230 km2 or a 61m wide strip about 3800 km in length. The total change area was about 1.4 km2 or about 0.09% per year. This change area included about 0.4 km2 new impervious surface with about 0.9 km2 of tree removal. While we do not quantify vegetation growth, tree and other vegetation growth likely outpaced loss during this time period. We will provide final statistics and examples of change events as part of this presentation. We believe this presents the first comprehensive Puget Sound wide assessment of change within the “Shorelands” defined by the SMA.