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E.g.: when increasing both the number of gridpoints and the run-period by a factor 2, the computation will take 8x longer (!)
User input fields
Default value are provided for a A number of input parameters. These fields are present which can be adjusted used to adjust the calculation according to the specific, local stituation. The . Default value are provided for each input parameters. The following input parameters can be defined:
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Select the transport formula that is used for the sediment transport calculation. You can choose between Kamphuis or CERC.
Physical parameters
- Breaker index - Defines the wave height at which waves start to break. The maximum wave height is defined by the breaker index times the local waterdepth. Value should be between 0.0001 and 1.
- Depth of closure - Maximum waterdepth at which waves still induce sediment transport. Beach volume changes are calculated up to this waterdepth. Value should be between 0.0001 and 30 m.
- Active height - Maximum height (on the dry beach) which can still be considered active by sediment transport gradients. Beach volume changes are calculated up to this active height. Value should be between 0.0001 and 40 m
- Water density - Value should be between 1000 kg/m3 (e.g. fresh water) and 1025 kg/m3 (e.g. salty water).
Computation parameters
- N points - The number of points on the staggered grid. A staggered grid with an equal grid spacing according to the number of points is defined along the coastline. Value should be between 1 and 999.
- Total time - The total number of years for the simulation. Value should be between 1 and 1000 years.
- Time interval - The number of years after which a calculated shoreline position will be plotted on the map. Value should be between 1 and 20 years.
Boundary parameters
- Left and right boundary - Define the boundary condition applied on the left and right boundaries of the coastline. You can choose between:
dS = 0 - same sediment transport between the boundary Right boundarycell and the left/right most grid cell.
S = 0 - no sediment transport on the boundary cell
Tool limitations
The following processes are not included in the tool: wave shadow zoning, alongshore varying wave climates, by-passing of breakwaters, non-linear beach profiles etc.
Results in terms of alongshore transports and coastline dynamics should therefore be interpreted with a considerable range of uncertainty.
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