Validation
Xbeach is much more flexible and has a lot more features than XBeach_GPU. XBeach is also more precise than XBeach_GPU. This is due to the fact that XBeach _GPU uses float decimal numbers rather than doubles. This results in the systematic introduction of a 10-7 error in all the variable in the model. Some of the output variable accumulate this error via advection schemes and other post processes. The table below list the difference between variable calculated by XBeach and XBeach_GPU.
| Variable Name | Error |
| H | 10-4 - 10-3 |
| URMS | 10-5 |
| Fx- Fy | 10-5 |
| zs | 10-5 |
| uu - vv | 10-5 |
| zb | 10-3 |
These errors where calculated in condition where both model used the same equations and the same time steps and using the same boundary conditions.
Although these error may seem significant, they are small compared with assumption made in the model.