TIDAL CHANNEL GEOMETRY OF BARRIER EMBAYMENT SYSTEMS IN PUGET SOUND
AbstractThis paper will present the first year of findings from a research project with the objective of producing empirically based models of tidal channel characteristics that can be broadly applied to design estuary restoration projects in Puget Sound. A combination of field data collection methods and desktop analysis are being utilized to calculate tidal prism, channel dimensions, marsh extent, and water surface elevations to parameterize well-functioning barrier embayments in Puget Sound. The tidal channel data will be used to conduct a regression analysis and develop hydraulic geometry scaling relationships. The goal of the study is to develop one set of regression lines for the Puget Sound basin; however, if the data collection reveals important differences between sub-basins, then two or more regressions may be developed. For example, Hood (2015) found wave exposure contributed to differences in tidal channel geometry in the major river deltas within Puget Sound. Differences in wave exposure and tide range among the sub-regions of Puget Sound could create a need for creating more than one set of scaling relationships (e.g. North Sound and South Sound).
Beamer, Henderson, McBride, Wolf (2003): The importance of non-natal pocket estuaries in Skagit Bay to wild Chinook salmon: an emerging priority for restoration. Skagit River System Cooperative, Research Department, La Connor, Washington. 10 p.
Cereghino, Toft, Simenstad, Iverson, Campbell, Behrens, Burke (2012): Strategies for nearshore protection and restoration in Puget Sound. Puget Sound Nearshore Report No. 2012-01.
Hood (2007): Scaling tidal channel geometry with marsh island area: A tool for habitat restoration, linked to channel formation process, Water Resource Research 43:W03409.
Hood (2015): Geographic Variation in Puget Sound tidal channel planform geometry. Geomorphology 230:98-108.
PSNERP (2011) Strategic restoration conceptual engineering design report. Appendix C: Applied geomorphology guidelines and hierarchy of openings