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- This section provides an overview of the sediment characteristics (, Porosity and ) used for the sediment transport calculation. Their values can be changed in the Sediment input in Generic Data.
| Default Value | Unit | Min. | Max. | Brief Description | ||
|---|---|---|---|---|---|---|
| D50D50 | 200 | μm | 1 | 2.0002000 | Median grain size. | |
| Porosity | 0.4 | - | 0 | 1 | Fraction of voids. | |
| Density | 2.6502650 | kg/m3 | 1.000 | 1000 | 50005.000 | Bulk sediment density. |
Transport formula
- Select the transport formula that is used for the sediment transport calculation. You can choose between Kamphuis or CERC.
Physical parameters
| Default Value | Unit | Min. | Max. | Brief Description | |
|---|---|---|---|---|---|
| Breaker index | 0.73 | - | 0.0001 | 1 | Defines the wave height at which waves start to break. The maximum wave height is defined by the breaker index times the local waterdepth. |
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| Depth of closure | 5 | m | 0.0001 |
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| 30 | Maximum waterdepth at which waves still induce sediment transport. Beach volume changes are calculated up to this waterdepth. |
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| Active height | 5 | m | 0.0001 |
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| 40 | Maximum height of the dry beach which can still be considered active by sediment transport gradients. Beach volume changes are calculated up to this active height. |
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| Water density |
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| 1025 | kg/m3 | 1000 | 1025 | Density of the water, which should be in between 1000 kg/m3 (e.g. fresh water) and 1025 kg/m3 (e.g. salty water). |
Computation parameters
| Default Value | Unit | Min. | Max. | Brief Description | |
|---|---|---|---|---|---|
| N points | 10 | - | 1 | 999 | 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 |
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| Total time |
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| 5 | years | 1 | 1000 | The total number of years for the simulation. |
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| Time interval | 1 | years | 1 | 20 | The number of years after which a calculated shoreline position will be plotted on the map |
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| . |
Boundary parameters
Left and right boundary - Define the boundary condition applied on the left (closest to the coastline origin/blue arrow) and right boundaries of the staggered grid. You can choose between:
| Brief Description | |
|---|---|
| dS = 0 |
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| The sediment transport on the boundary cell equals the sediment transport on the left/right most grid cell. | |
| S = 0 |
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| 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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