St. Augustine Inlet, Florida: Application of the Coastal Modeling System. Report 2
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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This report, the second in a series, documents a numerical modeling study performed with the Coastal Modeling System CMS, supported by field data collection, to quantify the impact of historical and future planned mining of the ebb-tidal delta at St. Augustine Inlet, FL. Recently, in the years 2001-2003 and 2005, two nourishment intervals utilized beach-quality sediment from the ebb-tidal delta at St. Augustine Inlet, resulting in 4.7 and 2.5 million cubic yards of sediment removed from the inlet system, respectively, for the two time periods. The CMS was used to determine the impact of these historical mining operations, as well as potential future minings on the natural littoral system in the vicinity of the inlet as well as the morphodynamics of the inlet. Quantitative comparisons of planform evolution, volumetric change, and transport pathway spatial distribution and magnitude were made for the historical and future scenarios. Results showed little to no changes in the ebb-tidal delta trajectory in these three quantitative comparisons. The footprint of the ebb-tidal delta mining did not change the bypassing patterns in a way such as to cause significant morphologic change to the inlet system. Modeling of planned alternatives including the removal of an additional 1.5, 3, and 4 million cubic yards mcy of sediment also illustrated a tipping point in morphodynamic response in varying volume removed and mining design.
- Physical and Dynamic Oceanography
- Hydrology, Limnology and Potamology