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Title: Detailed Hydrodynamic Feasibility Assessment for Leque Island and Zis a Ba Restoration Projects

Abstract

Numerous restoration projects are underway in Puget Sound, Washington, USA with the goal of re-establishing intertidal wetlands that were historically lost due to dike construction for flood protection and agricultural development. One such effort is the restoration effort within the Stillaguamish Delta, benefitting from the cumulative effects from the Leque Island and zis a ba restoration projects. The preferred restoration design calls for the removal of perimeter dikes at the two sites and the creation of tidal channels to facilitate the drainage of tidal flows. A 3-D high-resolution unstructured-grid coastal ocean model based on FVCOM was developed to evaluate the hydrodynamic response of the estuary to restoration alternatives. A series of hydrodynamic modeling simulations were then performed to quantify the hydrodynamic response of the nearshore restoration project, such as periodic inundation, suitable currents, and desired habitat/salinity levels. Sediment impacts were also examined, including the potential for excessive erosion or sedimentation requiring maintenance. Simulation results indicate that the preferred alternative scenario provides the desired estuarine response, which is consistent with the planned design. A decrease in velocities and bed shear in the main river channels was noted for the restored condition associated with the increased inundation of tidal flat area andmore » reduced tidal flows through the main channels. High bed shear near the restored tidal channel entrances indicates that the inlets may evolve in size until equilibrium is established.« less

Authors:
; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1496820
Report Number(s):
PNNL-SA-141524
Journal ID: ISSN 2077-1312
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Marine Science and Engineering
Additional Journal Information:
Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2077-1312
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
hydrodynamics, feasibility assessments, nearshore restoration, FVCOM, Puget Sound

Citation Formats

Nugraha, Adi, and Khangaonkar, Tarang. Detailed Hydrodynamic Feasibility Assessment for Leque Island and Zis a Ba Restoration Projects. United States: N. p., 2018. Web. doi:10.3390/jmse6040140.
Nugraha, Adi, & Khangaonkar, Tarang. Detailed Hydrodynamic Feasibility Assessment for Leque Island and Zis a Ba Restoration Projects. United States. doi:10.3390/jmse6040140.
Nugraha, Adi, and Khangaonkar, Tarang. Fri . "Detailed Hydrodynamic Feasibility Assessment for Leque Island and Zis a Ba Restoration Projects". United States. doi:10.3390/jmse6040140.
@article{osti_1496820,
title = {Detailed Hydrodynamic Feasibility Assessment for Leque Island and Zis a Ba Restoration Projects},
author = {Nugraha, Adi and Khangaonkar, Tarang},
abstractNote = {Numerous restoration projects are underway in Puget Sound, Washington, USA with the goal of re-establishing intertidal wetlands that were historically lost due to dike construction for flood protection and agricultural development. One such effort is the restoration effort within the Stillaguamish Delta, benefitting from the cumulative effects from the Leque Island and zis a ba restoration projects. The preferred restoration design calls for the removal of perimeter dikes at the two sites and the creation of tidal channels to facilitate the drainage of tidal flows. A 3-D high-resolution unstructured-grid coastal ocean model based on FVCOM was developed to evaluate the hydrodynamic response of the estuary to restoration alternatives. A series of hydrodynamic modeling simulations were then performed to quantify the hydrodynamic response of the nearshore restoration project, such as periodic inundation, suitable currents, and desired habitat/salinity levels. Sediment impacts were also examined, including the potential for excessive erosion or sedimentation requiring maintenance. Simulation results indicate that the preferred alternative scenario provides the desired estuarine response, which is consistent with the planned design. A decrease in velocities and bed shear in the main river channels was noted for the restored condition associated with the increased inundation of tidal flat area and reduced tidal flows through the main channels. High bed shear near the restored tidal channel entrances indicates that the inlets may evolve in size until equilibrium is established.},
doi = {10.3390/jmse6040140},
journal = {Journal of Marine Science and Engineering},
issn = {2077-1312},
number = 4,
volume = 6,
place = {United States},
year = {2018},
month = {11}
}