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. 




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



Message Boards

Using ddcouple

Alex Christensen, modified 4 Years ago.

Using ddcouple

Youngling Posts: 7 Join Date: 12/19/13 Recent Posts

I am trying to use the com output files from my FLOW simulation in DelWAQ. For each type of file (.are, .cco, etc), I have 10 parts (com-*-001.are, com-*-002.are, etc). I am not sure how to use ddcouple to put all 10 parts together. Can someone please explain this.

Thank you
Michel Jeuken, modified 4 Years ago.

RE: Using ddcouple

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
Hi Alex,

During the flow run a ddb-file was created. This should contain the definition of the ten domains. Be aware that this file is not always properly overwritten when you change the number of domains. It should contain number of domains minus one rows, mentioning all 10 of them. These are the 'adhesive edges' of the domains. ddcouple was developed for 'real' domain decompostion, but can also manage this parallel domain decomposition, but you have to tell the program.

This can be don running it from the prompt using:

ddcouple <name>.ddb -parallel

Or just run ddcouple, give the name of the ddb-file, and say yes to the next question (Has this ddb-file been created by a MPI-based parallel Delft3D FLOW run (y/n)?). I'm not sure if your setup already contains the latest version of ddcouple that asks this question. If not, you can download it here. The older version could only accept the -parallel switch from the prompt.

Gholamreza Shiravani, modified 1 Year ago.

RE: Using ddcouple

Padawan Posts: 65 Join Date: 6/25/16 Recent Posts

Hi Michel,

I tried ddcouple after generating com- files with Delwaq Option fron Delft-FLOW, but I got the attached error. Could you tell me the solution? How can I use ddcouple? Should I link it to my LD_LIBRARY_PATH?

Chao Li, modified 8 Months ago.

RE: Using ddcouple

Youngling Posts: 5 Join Date: 6/16/19 Recent Posts
<p>Hi Michel,</p>

<p>When I type y to the question (Has this ddb-file been created by a MPI-based parallel Delft3D FLOW run), the cmd prompt just flashed and vanished. Does that mean there is problem or do I have to proceed to choose one input and start the coupling again? Kind of puzzled how to merge the several .com files for PART simulation. Thanks a lot</p>