GenCade Val:LSTF

A model validation of shoreline evolution in a laboratory setting was performed for GenCade following a similar case presented in Hanson et al.(2006). The laboratory experiment was conducted in the USACE-ERDCCHL Large-Scale Sediment Transport Facility (LSTF) (Hamilton et al.2001) and the methodology and results are described in Gravens and Wang (2007). The validation experiment analyzes the capability of the GenCade model to calculate shoreline and salient evolution and tombolo formation in the lee of a detached breakwater in a controlled laboratory environment. It should be noted that Hanson et al. (2006) performed the GENESIS validation with a research version of GENESIS, which employed a different sediment transport formulation from what is employed in the release version of GENESIS-T (i.e., the version included with the CEDAS interface package) (Hanson and Kraus 1989) and in the current release of GenCade. Therefore, the results presented herein may be used to compare agreement between the measured results of the laboratory experiment and the calculated results from a different sediment transport formulation.A model validation of shoreline evolution in a laboratory setting was performed for GenCade following a similar case presented in Hanson et al.(2006). The laboratory experiment was conducted in the USACE-ERDCCHL Large-Scale Sediment Transport Facility (LSTF) (Hamilton et al.2001) and the methodology and results are described in Gravens and Wang (2007). The validation experiment analyzes the capability of the GenCade model to calculate shoreline and salient evolution and tombolo formation in the lee of a detached breakwater in a controlled laboratory environment. It should be noted that Hanson et al. (2006) performed the GENESIS validation with a research version of GENESIS, which employed a different sediment transport formulation from what is employed in the release version of GENESIS-T (i.e., the version included with the CEDAS interface package) (Hanson and Kraus 1989) and in the current release of GenCade. Therefore, the results presented herein may be used to compare agreement between the measured results of the laboratory experiment and the calculated results from a different sediment transport formulation.

GenCade model setup and parameters

Model domain

The GenCade model domain was developed to represent the LSTF lab experiment test case 1. The model grid was 60 m long with a 4 m long detached breakwater positioned in the center of the domain 4 m offshore of the initial shoreline position with both diffracting tips at a depth of 0.17 m. Model grid cell resolution was set to a constant 0.1 m (600 cells total). The model experiment was simulated for 24 hours as was the case in the laboratory case. GenCade lateral boundaries were selected as pinned beach boundaries. The median grain size (d50) was set at 0.15 mm as represented in the LSTF experiments. The berm height was set to 0.35 m and the depth of closure was set to 0.5 m. Figure 27 shows the LSTF domain. Additional model parameters are described in section 3.1.1.3 below.