Opened 17 years ago

Closed 17 years ago

#134 closed defect (fixed)

Problem with URS data?, momentum or conversion problem

Reported by: nick Owned by: duncan
Priority: high Milestone:
Component: Functionality and features Version: 1.0
Severity: normal Keywords:


Looking at this point (469000.00,7759900.00,0) which is located 100m from the ANUGA model boundary in 40m of water and it is not near any land, plus the water depth in both the URS and ANUGA models are every similar. The stage height and momentum at this point were compare from the boundary sww file created by URS data (
Gneiss\gem5nhi\inundation\data\western_australia\dampier_tsunami_scenario_2006\anuga\boundaries\o_test_8500_12000.sww) and a very simple ANUGA model (
Gneiss\gem5nhi\inundation\data\western_australia\dampier_tsunami_scenario_2006\anuga\outputs\20070311_225041_run\dampier.sww) that has only the URS data as boundary conditions and they are very similar. However it seems that the momentum (in particular the y momentum) from the URS data and therefore the ANUGA model is travelling towards the north instead of towards the south.

In another simple ANUGA model (
Gneiss\gem5nhi\inundation\data\western_australia\dampier_tsunami_scenario_2006\anuga\outputs\20070312_005351_run\dampier.sww), this time with a URS boundary on the north edge and on the southern edges there is no time varying input wave just Dirichlet condition at the tide height. This simple ANUGA model represents the basic model used for tsunami inundation in this region where the source is towards the north and travels to the coast towards in the south. The comparison shows that the stage height to be significantly different between models at this point. The time series plot from the URS boundary file has a 2 meter wave on top of the tide height and where the ANUGA model has only a 0.3m wave on top on the tide. The momentum is also significantly reduced. I believe this shows that the input wave from the URS data is not correct.

After many tests of different parts of ANUGA i'm pretty certain that the problem is not the reading of the boundary sww file, or the interpolation to the model boundary or how the model is tagged with certain boundaries or the evolution of the ANUGA model. What also confirm is the momentum is definite going to the north where other MOST boundary condition for a similar event has the momentum heading south.

Change History (2)

comment:1 Changed 17 years ago by ole

  • Owner changed from ole to duncan

This should be sorted out between David Burbidge and Duncan

comment:2 Changed 17 years ago by duncan

  • Resolution set to fixed
  • Status changed from new to closed

The specification of the mux binary files was incorrect. Velocity was described as being positive in the Northern direction. This was incorrect, it was positive in the Southern direction.

Using the correct specification fixed this error.

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