Chapter
Dec 11, 2012
Hydrodynamic Modeling Analysis of Tidal Wetland Restoration in Snohomish River, Washington
Publication: Estuarine and Coastal Modeling (2011)
Abstract
To re-establish the intertidal wetlands with full tidal interaction and improve the salmonid rearing habitat in the lower Snohomish River estuary, a diked wetland along Union Slough of the Snohomish River was restored by breaching the existing dike and constructing bridges across the breaches. However, post-restoration monitoring indicated that the restored project site could not drain as efficiently as desired. To improve the drainage conditions at the restoration site during low tides, a modeling study was conducted to evaluate additional restoration scenarios and to provide recommendations for finish-grade ground elevations to achieve the desired drainage. To accurately simulate the drainage of the project site, an unstructured-grid hydrodynamic model with fine-grid resolution down to a few meters was used in this study. The model was first validated with observed water level data collected in the project site, and then applied to assess the feasibility of different proposed restoration scenarios. A spatial varying bottom roughness option in the model is also implemented to better represent the high roughness due to the presence of dense vegetation in the project site. The methodology, error statistics of model validation, and uncertainty of the modeling analysis are presented and discussed.
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© 2013 American Society of Civil Engineers.
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Published online: Dec 11, 2012
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Pacific Northwest National Laboratory, 1100 Dexter Avenue North, Suite 400, Seattle, WA 98109. E-mail: [email protected]
Taiping Wang
Pacific Northwest National Laboratory, 1100 Dexter Avenue North, Suite 400, Seattle, WA 98109
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