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dc.contributor.authorJones, Keaton E.-
dc.contributor.authorDahl, Travis A.-
dc.contributor.authorCorum, Zachary P.-
dc.identifier.govdocERDC/CHL TR-18-9-
dc.descriptionTechnical Reporten_US
dc.description.abstractThe design of the Lower White River Countyline Setback Project in Washington State includes lowering an existing levee and constructing a new setback levee to allow the river to reconnect to an existing wetland. This study used two hydrodynamic and sediment transport models, Hydrologic Engineering Center-River Analysis System (HEC-RAS), and Adaptive Hydraulics (AdH), to model the river and compare the ability of one-dimensional (1D; HEC-RAS) and two-dimensional (2D; AdH) models to simulate hydraulic and sediment behavior in a levee setback project. Overall, both the 1D and the 2D model are well calibrated and indicate that the setback project will increase deposition within the reach. The spatial location of aggradation differs between the two models due to fundamental differences between the 1D and 2D approaches. The 1D model assumes that the river will avulse into the setback area and projects deposition in both the setback and former channel while the 2D model results show most of the aggradation occurring in the setback area. This study shows that, while 1D models can be valuable screening tools for levee setbacks, 2D models of setbacks should be considered when multiple channels may develop, there are lateral processes, or the difference between channel and setback gradations is important.en_US
dc.description.sponsorshipPrepared for U.S. Army Corps of Engineers, under Project 45633 "Evaluation of Levee Setbacks and River Restoration Projects for Flood Risk Reduction"en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers. Seattle District.-
dc.description.sponsorshipFlood and Coastal Systems Research and Development Program (U.S.)-
dc.description.tableofcontentsAbstract ii Figures and Tables iv Preface vi Unit Conversion Factors vii 1 Introduction 1 1.1 Objective 1 1.2 Background 1 1.3 Approach 5 2 One-Dimensional (1D) Hydrologic Engineering Center-River Analysis System (HEC- RAS) Sediment Transport Modeling 7 2.1 Model geometry 7 2.2 Boundary conditions 11 2.3 Sediment data and sediment transport modeling approach 13 3 Two-Dimensional (2D) Adaptive Hydraulics (AdH) Model 17 3.1 Mesh development 17 3.2 Hydraulic boundary conditions 22 3.3 Sediment data 24 4 Calibration Period Results 26 4.1 HEC-RAS calibration 26 4.2 AdH calibration 29 5 Water Years (WY) 2006–2007 Results 33 5.1 HEC-RAS WY 2006–2007 results 33 5.2 AdH WY 2006–2007 results 36 6 Discussion 46 7 Conclusions 49 References 50 Appendix A: Starting Sediment Distribution 51 Appendix B: Final Sediment Distribution 55 Report Documentation Page-
dc.format.extent79 pages/9.776Mb-
dc.publisherCoastal and Hydraulics Laboratory (U.S.)en_US
dc.relation.ispartofseriesTechnical Report (Coastal and Hydraulics Laboratory (U.S.));no.ERDC/CHL TR-18-9-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat.-
dc.subjectRestoration ecologyen_US
dc.subjectSedimentation and depositionen_US
dc.subjectSediment transporten_US
dc.subjectWhite River (Wash.)--Flood controlen_US
dc.subjectRiver (Wash.)--Leveesen_US
dc.titleModeled Sedimentation in the Lower White River Countyline Levee Setback, Washington State : Comparison of 1D (HEC-RAS) and 2D (AdH) Resultsen_US
Appears in Collections:Technical Report

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