Long-Term Morphology Modeling for Barrier Island Tidal Inlets
Styles, Richard.; Brown, Mitchell E.; Brutsché, Katherine E.; Li, Honghai.; Beck, Tanya M.; Sánchez, Alejandro.
The U.S. Army Corps of Engineers, Coastal Inlets Research Program, conducted at the U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, has developed the Coastal Modeling System (CMS) as a coupled wave, hydrodynamic, and sediment transport numerical modeling system. The primary focus of this study is to validate CMS for long-term applications through simulations of tidal inlet evolution and verify the results against established theoretical and empirical formulations that describe the stability and equilibrium conditions of tidal inlets. A wide range of conditions are chosen to test the breadth of model applicability including varying waves, tide and inlet geomorphic characteristics. The model is run for 100 years and the resulting morphological state is gauged in terms of inlet stability theory. Overall, CMS compares well to theoretically and empirically predicted inlet cross-sectional areas with some noted deviations due in part to the artificial nature of the idealized inlet geometry. The sharp spatial transition at either end of the inlet throat leads to artificially large gradients that may increase erosion and associated cross-sectional area. The results suggest that CMS can efficiently and accurately, to the degree of available empirical information, quantify long-term evolution of barrier island tidal inlet systems.
Coastal and Hydraulics Laboratory (U.S.)
Barrier islands; Computer simulation; Geomorphology; Hydrodynamics; Inlets; Numerical analysis
Technical Report (Coastal and Hydraulics Laboratory (U.S.));no.ERDC/CHL TR-18-12
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