INLET TEST CASE
This test case couples ROMS and SWAN directly using the Modeling Coupling Toolkit (MCT) library. To run this application the user needs to activate INLET_TEST. It only can be run in distributed-memory (MPI) since the parallel threads are split to run both ROMS and SWAN at the same time. This test illustrates the significance of wave-current coupling. This application and coupling methodology is described in Warner et al. (2008).
This test case models and idealized tidal inlet system. The model domain is a 15x14 km rectangle with a uniform initial depth of 4 m. The model setup parameters are shown in the table below. The domain is separated into two regions: the seaward (top) and back-barrier (bottom) regions. The seaward region is open with radiation conditions on the western, northern and eastern edges. The back-barrier region is enclosed with four walls and is connected to the seaward region through a 2 km wide inlet. The model is forced by a tide and waves. An oscillating water level is imposed on the northern edge with a tidal amplitude of 1 m. Waves are also imposed on the northern edge with a height of 1 m, directed to the south with a period of 10s.
Table 1. Important model parameters:
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| Model Parameter | Variable | Value |
|---|---|---|
| length, width, depth | $Xsize$, $Esize$, $depth$ | 15000 m, 14000 m, 4.0 m |
| number of grid spacings | $Lm$, $Mm$, $Nm$ | 75, 70, 10 |
| bottom Roughness | $z_{ob}$ | 0.015 m |
| time step | dt | 10 s |
| simulation steps | $Ntimes$ | 17280 steps (2 days) |
| morphology factor | $morph\_fac$ | 10 (=20 day scaled simulation) |
| grain size | $sd50$ | 0.10 mm |
| settle velocity | $w_s$ | 11.0 mm s-1 |
| erosion rate | $E_o$ | 5 x 10-3 kg m-2s-1 |
| critical stress | $\tau_{cd}$, $\tau_{ce}$ | 0.10 Nm-2 |
| porosity | $\phi$ | 0.50 |
| bed thickness | $bed\_thick$ | 10.0 m |
| northern edge tide | $A$, $T_t$ | 1.0 m, 12 h |
| northern edge wave height | $H_{sig}$ | 2 m |
| northern edge wave period | $T$ | 10 s |
| northern edge wave direction | $\theta$ | from 0° (from North) |
</wikitex>
Below we provide a brief example of the model output.
