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

"merging com files ..restarted hydrdynamic files...particle tracking"

shanas pr, modified 2 Years ago.

"merging com files ..restarted hydrdynamic files...particle tracking"

Padawan Posts: 29 Join Date: 10/20/11 Recent Posts

Hai all

I am in a process of doing particle tracking module from the successful hydrodynamic flow results.

steps followed 

1.Activated the 'Export WAQ' in the output tab of the GUI, all the necessary files, including ddb file, are automatic created

2.ddcouple done the parallel domain merging and eventually given as input to the PART like a champ !!


Now my issue is I have set of flow  simulation with the same setup say starting from  1) 1/1/2017- 20/1/2017  and one restarted in separate folder 2) 20/1/2017- 28/2/2017
I would like to combine both as one com* hydrodynamic files which would be ready to use for particle tracking.


Some options i tried as mentioned in the previous comments 1) waq>defineinput>hydrodynamics>combine which is failed and (note : bringing very large files  to windows platform and doing combining task is tedious task)

looking forward for  effective solution.




Michelle Jeuken, modified 2 Years ago.

RE: "merging com files ..restarted hydrdynamic files...particle tracking"

Jedi Knight Posts: 154 Join Date: 1/21/13 Recent Posts



You might want to try this version of agrhyd, a tool to manipulate hyd-files. It has a feature to merge partial hyd-files and their restarts from a FLOW run. It is run from a command prompt using:


agrhyd <ini_name>.ini

In the folder win64/default is an example agrhyd.ini with limited documentation of the options. You could try making an ini-file that contains:


No aggregation options are needed. Check the log, and the output hyd-file. It might be that if the first period intentionally stops at 20/1/2017, the end date in the combined hyd-file might be 20/1/2017, but the vol/flo/etc files actually contain data until 28/2/2017. The size of the output should be about the sum of the two separate files for the vol/flo/etc files.




yu jia xin, modified 2 Years ago.

RE: "merging com files ..restarted hydrdynamic files...particle tracking"

Youngling Posts: 5 Join Date: 12/1/18 Recent Posts

Hello michelle, I am now self-study water quality module, used to study the numerical simulation of pollutant transport and diffusion along the coastal port. The previous hydrodynamic module has been basically completed and verified reasonably. Now I am following the manual to learn the water quality module. You also know The construction of the water quality module involves a lot of biochemistry knowledge, so I feel a little difficult to learn through the model manual. I would like to ask if you have any guidance or suggestions for learning the water quality module. Thank you very much!