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U.S. Geological Survey Open-File Report 2012-1234

Application of a Hydrodynamic and Sediment Transport Model for Guidance of Response Efforts Related to the Deepwater Horizon Oil Spill in the Northern Gulf of Mexico Along the Coast of Alabama and Florida

Title Page | Contents | List of Figures | List of Tables | Conversion Factors | Abbreviations | Executive Summary | Introduction | Methods | Results | Digital Data Files | Discussion | Summary and Conclusions | References Cited | Appendix 1. Scenarios | Appendix 2. Example Model Input Files | Appendix 3. Calculations of Mobility and Potential Flux | Appendix 4. File Naming Conventions | Appendix 5. Time Step of Maximum Ebb and Flood for Inlets in the Model Domain

Figure 10, critical stress as a function of grain size and density.
Figure 9. Critical stress of sand and surface residual balls (SRBs) along the Alabama and Florida Gulf coast, after Shields (1936) shown as a function of density and grain size for six particle sizes. For each standardized surface residual ball (SRB) grain size (table 1), we calculate the critical stress for the range of observed SRB densities, with the resultant critical stress mean and one standard deviation shown. The critical stress calculated for each size using the mean SRB density is within the small range of variability but is greater than the critical stress of a particle of the same size with the density of quartz sand.
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