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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 28, variation in mobility with tidal cycle at Little Lagoon.
Figure 28. Tidal inlet surface residual ball (SRB) mobility (table 2, metric 9) at A, maximum flood and B, maximum ebb for 2.5-centimeter SRBs (table 1) using a low critical threshold at Little Lagoon Inlet, Ala. (fig. 1). Areas where the mobility ratio is 1 (in pink) indicate that the critical threshold for SRB mobility is exceeded. The greater extent of tidal inlet SRB mobility during flood increases the probability that SRBs brought in by the tide will remain trapped. Local surficial sediment is mobilized throughout the illustrated domain during both flood and ebb tide, leading to potential for burial and exposure of SRBs.
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