GenCade Val:Benchmark Cases
A series of standardized test cases was developed to demonstrate isolated GenCade model capabilities and verify results against established legacy models (e.g., GENESIS). Simple idealized cases focusing on each of the primary model processes and coastal structures were evaluated separately.Isolation of individual modeled components is an effective means of examining the fundamental skill of a model and can be a practical tool for identifying potential errors, oversights, or omissions when investigating individual components of the model under simple idealized cases.A series of standardized test cases was developed to demonstrate isolated GenCade model capabilities and verify results against established legacy models (e.g., GENESIS). Simple idealized cases focusing on each of the primary model processes and coastal structures were evaluated separately. Isolation of individual modeled components is an effective means of examining the fundamental skill of a model and can be a practical tool for identifying potential errors, oversights, or omissions when investigating individual components of the model under simple idealized cases.
The standardized benchmark cases developed here are separated into the primary coastal structures and project components that are frequently applied in GenCade. Each of the cases is presented with a range in wave forcing to test symmetry of process calculation. GENESIS simulations were also developed following corresponding test cases to evaluate how GenCade results agree with the well-validated legacy model and to support user-confidence for the transfer and migration from GENESIS.
GenCade model setup
Model domain
Two categories of idealized model domains were developed for the standardized benchmark cases: straight shoreline domains and concave embayment domains. The purpose of the straight shoreline domains is to provide an uncomplicated foundation to test the most fundamental processes and the impact of coastal structures within the GenCade model. The purpose of the concave embayment domains is to examine the effects wave forcing and structures have on a continuous and uniform alongshore shoreline angle gradient and examine regional contour capabilities. Figures 29 through 35 show each of the seven domains in the straight shoreline category. Figure 29 represents the simplest case with a straight shoreline and no structures or project features within the domain. Figures 30 through 35 build upon this domain with the addition of individual coastal structures or project components. These structures or components include: a single groin (Figure 30), a detached breakwater (Figure 31), a T-head groin (Figure 32), a seawall with a groin to force shoreline erosion to the seawall (Figure 33), a beach fill project (Figure 34), and an inlet with jetties (Figure 35).
Figures 36 and 37 show the two domains in the concave shoreline category. The concave shorelines were developed using a simple quadratic formula to maintain symmetry. The quadratic function employed for these concave shorelines was:
y = ax2
where a = 10-4. Figure 36 represents a simple case with a concave shoreline and no structures or project features within the domain. Figure 37 builds upon this domain with the addition of two groins.
