Use of a Modified Hybrid Model to Analyze the Effectiveness of Jetties in Reducing Marina Sedimentation

by S. Jarrell Smith, (S.M.ASCE), Clemson Univ, Clemson, United States,
E. J. Hayter, (M.ASCE), Clemson Univ, Clemson, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: The effectiveness of the construction of jetties near the entrance channel of a coastal marina in reducing marina sedimentation has been analyzed using a modified hybrid model. The modified hybrid model consists of a coupled two-dimensional, finite-element, hydrodynamic and cohesive-sediment transport model and a physical model. The finite element model was used to model the hydrodynamics and cohesive sediment transport in Winyah Bay and Belle Isle Marina, South Carolina, and the physical model was used to aid in the calibration of the numerical model to the near-field flow in proximity to the marina. The physical model features an artificial boundary corresponding to the location of the dredged navigation channel in Winyah Bay. The use of this artificial boundary is justified by streamline observations in the calibrated numerical model. Using the calibrated hydrodynamic and cohesive-sediment transport model, the marina sedimentation rates for the various proposed jetty configurations were determined. The modified hybrid model was analyzed and found to be effective in modeling the dominant processes affecting sedimentation in Belle Isle marina.

Subject Headings: Sediment | Ports and harbors | Hydrologic models | Physical models | Hybrid methods | Numerical models | Hydraulic models | Sediment transport | Finite element method | Model analysis | Jetties | South Carolina | North America | United States

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