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. 
 

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

 

 

Message Boards

D-WAQ PART - Changing the number of threads

GG
gustavo gomes, modified 5 Years ago.

D-WAQ PART - Changing the number of threads

Youngling Posts: 2 Join Date: 12/18/12 Recent Posts
Dear,
I'm using the PART model in an oil spill project, running a large number of simulations (about 500) in serial mode for probabilistic results. Until now was using the version of 4:00:02 Delft3D and the PART used only one (1) thread. However, this version showns some instabilities to write files when the simulation ends, generating error and pausing the serial simulations. Therefore I installed the version of 4:01:00 Delft3D that corrected these bugs. However, by default, this latest version of D-WAQ PART uses all threads of processor and I wonder if you can change the number of threads for each simulation. Since I am simulating about 4-5 models in parallel and need to manage the number of threads to avoid calculation trouble.

Thanks for attention,
Gustavo
AM
Arjen Markus, modified 5 Years ago.

RE: D-WAQ PART - Changing the number of threads (Answer)

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
You can control the number of threads by setting the environment variable OMP_NUM_THREADS to the required number. See for instance: https://www.dartmouth.edu/~rc/classes/intro_openmp/compile_run.html.

If you are using WIndows, then:

c:\> set OMP_NUM_THREADS=1
c:\> delpar

should do the trick.
GG
gustavo gomes, modified 5 Years ago.

RE: D-WAQ PART - Changing the number of threads

Youngling Posts: 2 Join Date: 12/18/12 Recent Posts
Thank you Arjen. It worked.