RE: River modelling - river dries up - Forum - Delft3D
Forum
- Home
- 3. Archive
- River
- RE: River modelling - river dries up
RE: River modelling - river dries up
Manoj Kumar, modified 9 Years ago.
River modelling - river dries up
Youngling Post: 1 Join Date: 11/5/15 Recent Posts
Hi All,
I am new to delft3d and trying to do river modelling as an example. I have generated the mesh in Delft3d rgfgrid and have prepared the depth file in quickin. Both the banks of the river are at zero water level. I have applied water level at outflow boundary condition and done discharge operation (type normal ) at inlet. The simulation runs without error. However when I post process it seems the river has dried up. Attached image 1 (initilization ) and image 2 (the final water level).
Kindly help me to model it correctly.
Regards,
Manoj
I am new to delft3d and trying to do river modelling as an example. I have generated the mesh in Delft3d rgfgrid and have prepared the depth file in quickin. Both the banks of the river are at zero water level. I have applied water level at outflow boundary condition and done discharge operation (type normal ) at inlet. The simulation runs without error. However when I post process it seems the river has dried up. Attached image 1 (initilization ) and image 2 (the final water level).
Kindly help me to model it correctly.
Regards,
Manoj
Attachments:
Richard Measures, modified 9 Years ago.
RE: River modelling - river dries up
Padawan Posts: 30 Join Date: 3/23/11 Recent Posts
Hi Manoj,
Have you checked the water level set in your downstream/outflow boundary condition. Your initial condition has a water level of 5m but the water level then drops to ~0m by the end of your simulation.
Also maybe check the sign convention you have used when setting your boundary condition and depth. For depth the sign convention is positive downwards (bigger values are lower, positive depths are below the datum), but for the water level boundary condition and initial condition the sign convention is positive upwards (bigger values are higher, positive levels are above the datum).
Hope that helps?
Cheers,
Richard
Have you checked the water level set in your downstream/outflow boundary condition. Your initial condition has a water level of 5m but the water level then drops to ~0m by the end of your simulation.
Also maybe check the sign convention you have used when setting your boundary condition and depth. For depth the sign convention is positive downwards (bigger values are lower, positive depths are below the datum), but for the water level boundary condition and initial condition the sign convention is positive upwards (bigger values are higher, positive levels are above the datum).
Hope that helps?
Cheers,
Richard
Xiaoya Zhang, modified 5 Years ago.
RE: River modelling - river dries up
Youngling Posts: 3 Join Date: 9/8/19 Recent Posts
Dear Richard,
I am making a Delft3D two-dimensional sediment model to simulate the changes of riverbed scouring and silting in the flume test, but the result is very small and does not conform to the test result. Is Delft3D suitable for the channel in the simulation flume? And I don't understand why the sediment transport parameter setting at the boundary has no effect on the final result of erosion and deposition.
Any feedback would be very helpful.
Thanks in advance for your time and answer.
Zhang
I am making a Delft3D two-dimensional sediment model to simulate the changes of riverbed scouring and silting in the flume test, but the result is very small and does not conform to the test result. Is Delft3D suitable for the channel in the simulation flume? And I don't understand why the sediment transport parameter setting at the boundary has no effect on the final result of erosion and deposition.
Any feedback would be very helpful.
Thanks in advance for your time and answer.
Zhang
Attachments: