intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 
 

** PLEASE TAG YOUR POST! **

 

 

Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

Message Boards

child process exited abnormally

MA
Md Bin Siddique, modified 7 Years ago.

child process exited abnormally

Padawan Posts: 42 Join Date: 12/17/12 Recent Posts
When i try to run flow modeule there show this message please help me


Starting Delft3D-FLOW computation ...
--------------------------------------------------------------------------------
Deltares, Delft3D-FLOW Version 4.00.01.000000, Mar 15 2011, 10:57:16
flow2d3d.dll entry RUNME
--------------------------------------------------------------------------------

Part I - Initialisation Time Dep. Data module...
runid : Bhola
Part II - Creating intermediate files...
Part III - Initialisation of the Execution module...
*** WARNING Double precision computation using reals of kind 8
Part IV - Reading complete MD-file...
Part V - Initialisation & checking input...
Part VI - Initialisation & checking second part...
Part VII - Initialisation output...
Part VIII - Start Simulation...

Time to finish 0s, 0.0% completed, time steps left 5760
Time to finish 5m 17s, 0.0% completed, time steps left 5759
Time to finish 3m 16s, 0.0% completed, time steps left 5758
Time to finish 2m 39s, 0.1% completed, time steps left 5757
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Flow exited abnormally
Check diagnosis file


child process exited abnormally
Qinghua Ye, modified 7 Years ago.

RE: child process exited abnormally

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
dear Md Bin,

Can you also paste the content of diagnose file here as well?

Regards,

Qinghua YE
SK
Sarah Kandrot, modified 6 Years ago.

RE: child process exited abnormally

Youngling Posts: 19 Join Date: 9/19/13 Recent Posts
Hello,

I am getting this same message:

Flow exited abnormally
Check diagnosis file


child process exited abnormally

I set up the mdf in delft dashboard, but the batch file wouldn't run, so I decided to run the mdf file using the Delft 3D GUI. Diagnosis file is attached. Please help!

-Sarah
MS
Mihael Souza, modified 6 Years ago.

RE: child process exited abnormally

Padawan Posts: 65 Join Date: 10/11/12 Recent Posts
Hi Sarah,

I'm by no means an expert, but this type of error can have multiple reasons.
Large time steps can be one of them, although I would've expected some Courant warnings to pop-up before the model crashing. Have you checked your Courant criteria through Quickin to make sure your time step is in accordance with your mesh size?
This can also be related to abrupt changes in your boundary conditions. For example, if you're using a tidal elevation time-series make sure your input has a smooth transition between different time points, as abrupt changes can introduce numerical instabilities.
Some other things can cause your model to crash, like wrong roughness values or abrupt changes in depth between neighboring grid cells.

I would recommend you check your inputs and make sure they are all correct/have smooth transitions.
If that doesn't help, and you're working on a complex model, you could start stripping your model of processes to try and locate where the problem is.
As a last resort you could lower your time step to see if that solves your problem, but this approach doesn't necessarily solve the issue if there is a problem with your model setup.

Hope this helps.
Regards,

Mihael Souza
TL
Tony Lee, modified 3 Years ago.

RE: child process exited abnormally

Youngling Posts: 9 Join Date: 4/1/17 Recent Posts
Hi Mihael?
I tried to cope with it and found that you're right.It is related to wrong roughness values.
Another question comes in.
How can I gain right one?If I have a xyz .dep file ,dose it mean I can calculate roughness via it ?
Any suggestions would be appreciated.
Best regards.