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Modeling of River Hydrodynamics and Active Cap Effectiveness in the Anacostia River Keegan L

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Modeling of River Hydrodynamics and Active Cap Effectiveness in the Anacostia River Keegan L Louisiana State University LSU Digital Commons LSU Master's Theses Graduate School 2004 Modeling of river hydrodynamics and active cap effectiveness in the Anacostia River Keegan L. Roberts Louisiana State University and Agricultural and Mechanical College, [email protected] Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_theses Part of the Civil and Environmental Engineering Commons Recommended Citation Roberts, Keegan L., "Modeling of river hydrodynamics and active cap effectiveness in the Anacostia River" (2004). LSU Master's Theses. 2610. https://digitalcommons.lsu.edu/gradschool_theses/2610 This Thesis is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Master's Theses by an authorized graduate school editor of LSU Digital Commons. For more information, please contact [email protected]. MODELING OF RIVER HYDRODYNAMICS AND ACTIVE CAP EFFECTIVENESS IN THE ANACOSTIA RIVER A Thesis Submitted to the Graduate Faculty of the Louisiana State University and Agricultural and Mechanical College In partial fulfillment of the Requirements for the degree of Master of Science in Civil Engineering In The Department of Civil and Environmental Engineering by Keegan L. Roberts BS, Louisiana State University, 2001 December 2004 Acknowledgements As with any undertaking I have ever attempted in my life, there is no way that I could have completed this endeavor without the assistance of numerous family and friends. Whether providing professional guidance, assistance, or moral support, you have all made this research and its culmination, this thesis, possible. I cannot thank you all enough. To all my friends: thank you for providing the numerous social diversions that I have come to enjoy so much. Without all of you, I would have probably graduated much sooner. To my committee members, Dr. David Constant, Dr. Danny Reible, and Dr. Clint Willson: thank you for your endless, beneficial guidance and support. Although I am proud to have had you all as advisors, I am most proud to call you friends. To my family: thank you for having shown me the true meaning of love and devotion. For having put up with my incessant need for assistance I am eternally indebted. To Kyle: for having been my closest friend and confidant, thank you. You have shown me the true meaning of adversity and perseverance, of will and determination. ii Table of Contents Acknowledgements......................................................................................................................... ii Abstract........................................................................................................................................viii Chapter 1: Introduction................................................................................................................... 1 1.1 Anacostia River Demonstration Site Description................................................................. 3 1.2 HSRC Anacostia Remediation Effort ................................................................................... 6 1.3 Literature Review.................................................................................................................. 7 1.3.1 Review of Previous Anacostia River Hydrodynamic Studies ....................................... 7 1.3.2 Review of Previous Anacostia River Sediment Transport Studies................................ 9 1.3.3 Review of Previous Anacostia River Chemical Fate and Transport Studies................. 9 1.3.4 Review of Alternative Predictive Hydrologic Modeling Software Packages................ 9 1.3.5 Review of Alternative Predictive Sediment Transport Modeling Software Packages 10 1.3.6 Review of Alternative Predictive Chemical Transport Modeling Software Packages 11 1.3.7 MARS Model Hierarchy.............................................................................................. 11 1.4 Research Objectives............................................................................................................ 11 Chapter 2: Hydrodynamic Modeling of the Anacostia River ....................................................... 14 2.1 Description of Grid Generation for MARS Model............................................................. 14 2.2 Description of MARS Hydrodynamic Model Variables and Inputs................................... 15 2.2.1 Length of Simulation ................................................................................................... 15 2.2.2 Print Interval ................................................................................................................ 16 2.2.3 Dimensionless Drag Coefficient.................................................................................. 17 2.2.4 Horizontal Dispersion Parameter................................................................................. 17 2.2.5 Tidal/River Variable .................................................................................................... 18 2.2.6 a, b, and c in the Depth-Flow Function........................................................................ 18 2.2.7 12-hour and 24-hour Tidal Phase................................................................................. 19 2.2.8 12-hour and 24-hour Tidal Amplitudes ....................................................................... 20 2.2.9 Depth Shift................................................................................................................... 20 2.2.10 Water Column Depth ................................................................................................. 20 2.2.11 Flow Rate................................................................................................................... 21 2.3 Development of MARS Hydrodynamic Model Variables and Inputs to Simulate Anacostia River Flow Events..................................................................................................................... 22 2.3.1 Length of Simulation ................................................................................................... 22 2.3.2 Print Interval ................................................................................................................ 23 2.3.3 Dimensionless Drag Coefficient.................................................................................. 23 2.3.4 Horizontal Dispersion Parameter................................................................................. 23 2.3.5 Tidal/River Variable .................................................................................................... 23 2.3.6 a, b, and c in the Depth-Flow Function........................................................................ 24 2.3.7 12-hour and 24-hour Tidal Phase................................................................................. 26 2.3.8 12-hour and 24-hour Tidal Amplitudes ....................................................................... 27 2.3.9 Depth Shift................................................................................................................... 27 2.3.10 Water Column Depth ................................................................................................. 27 2.3.11 Flow Rate................................................................................................................... 27 iii 2.4 MARS Hydrodynamic Model Results................................................................................ 27 2.4.1 Hydrodynamic Model Results ..................................................................................... 28 2.5 Conclusions and Recommendations for Future Improvements.......................................... 32 2.5.1 Conclusions.................................................................................................................. 32 2.5.2 Recommendations for Future Improvements............................................................... 32 Chapter 3: Sediment Transport Modeling of the Anacostia River ............................................... 34 3.1 Description of MARS Hydrodynamic Model Variables and Inputs................................... 35 3.1.1 Print Interval ................................................................................................................ 36 3.1.2 Dry Density.................................................................................................................. 36 3.1.3 Bottom Friction Coefficient......................................................................................... 36 3.1.4 Initial Concentration .................................................................................................... 39 3.1.5 Boundary Concentration .............................................................................................. 39 3.1.6 α and β in Settling Equation........................................................................................ 39 3.1.7 Critical Shear Stress for Erosion.................................................................................. 41 3.1.8 ao, n, and m in Sediment Erosion Equation ................................................................. 41 3.1.9 Upstream Concentration .............................................................................................. 42 3.1.10 Critical Shear Stress, Layers 1 through 7................................................................... 42 3.1.11 Time Step..................................................................................................................
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