View source for INLET TEST CASE

<div class="title">Inlet Test Case</div>

This test case couples ROMS and [[SWAN]] directly using the Modeling Coupling Toolkit (MCT) library. To run this application the user needs to activate [[Options#INLET_TEST|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 [[Bibliography#WarnerJC_2008a|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.

Files to run this test case can be downloaded [[media:Inlet_test_config.zip|here]].

Table 1. Important model parameters:
{| border="1" cellspacing="0" cellpadding="5" align="center"
!Model Parameter
!Variable
!Value
|-
|length, width, depth
|[[Variables#Xsize|Xsize]], [[Variables#Esize|Esize]], [[Variables#hmax|hmax]]
|15000 m, 14000 m, 4.0 m
|-
|number of grid spacings
|[[Variables#Lm|Lm]], [[Variables#Mm|Mm]], [[Variables#N|N]]
|75, 70, 10
|-
|bottom Roughness
|[[Variables#Zob|Zob]]
|0.015 m
|-
|time step
|[[Variables#dt|dt]]
|10 s
|-
|simulation steps
|[[Variables#ntimes|ntimes]]
|17280 steps (2 days)
|-
|morphology factor
|[[Variables#morph_fac|morph_fac]]
|10 (=20 day scaled simulation)
|-
|grain size
|[[Variables#Sd50|Sd50]]
|0.10 mm
|-
|settle velocity
|[[Variables#Wsed|Wsed]]
|11.0 mm s<sup>-1</sup>
|-
|erosion rate
|[[Variables#Erate|Erate]]
|5 x 10<sup>-3</sup> kg m<sup>-2</sup>s<sup>-1</sup>
|-
|critical stress
|[[Variables#tau_cd|tau_cd]], [[Variables#tau_ce|tau_ce]]
|0.10 Nm<sup>-2</sup>
|-
|porosity
|[[Variables#poros|poros]]
|0.50
|-
|bed thickness
|[[Variables#bed|bed(:, :, :, ithck)]]
|10.0 m
|-
|northern edge tide
|A, T<sub>t</sub>
|1.0 m, 12 h
|-
|northern edge wave height
|H<sub>sig</sub>
|2 m
|-
|northern edge wave period
|T
|10 s
|-
|northern edge wave direction
|&theta;
|from 0&deg; (from North)
|-
|}

Below we provide a brief example of the model output.

[[Image:Inlet_test_zeta_day0.5.png|thumb|850px|none|<center><b>Figure 1:</b> ROMS output of free surface and barotropic currents at t=0.5 days.</center>]]


[[Image:Inlet_test_Hwave_day0.5.png|thumb|850px|none|<center><b>Figure 2:</b> SWAN output of wave height (Hwave, m) and barotropic currents.]]