Evaluation of the physical process controlling beach changes adjacent to nearshore dredge pits |
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| Authors: | L Benedet JH List |
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| Institution: | aCoastal Planning & Engineering, Inc. 2481 NW Boca Raton Boulevard, Boca Raton, FL, 33431, USA;bDelft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands;cU.S. Geological Survey, 384 Woods Hole Rd., Woods Hole, MA 02543, USA |
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| Abstract: | Numerical modeling of a beach nourishment project is conducted to enable a detailed evaluation of the processes associated with the effects of nearshore dredge pits on nourishment evolution and formation of erosion hot spots. A process-based numerical model, Delft3D, is used for this purpose. The analysis is based on the modification of existing bathymetry to simulate “what if” scenarios with/without the bathymetric features of interest. Borrow pits dredged about 30 years ago to provide sand for the nourishment project have a significant influence on project performance and formation of erosional hot spots. It was found that the main processes controlling beach response to these offshore bathymetric features were feedbacks between wave forces (roller force or alongshore component of the radiation stress), pressure gradients due to differentials in wave set-up/set-down and bed shear stress. Modeling results also indicated that backfilling of selected borrow sites showed a net positive effect within the beach fill limits and caused a reduction in the magnitude of hot spot erosion. |
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| Keywords: | Erosion hot spot Delft3D Beach nourishment Numerical modeling Sediment transport Beach volume change Delray Beach |
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