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

How to view parameter (*.par) file?

Justin Ibershoff, modified 5 Years ago.

How to view parameter (*.par) file?

Youngling Posts: 1 Join Date: 1/6/15 Recent Posts
Hi. I am looking for a way to open and view the contents of the parameter (*.par) file. Can any of the Delft3D utilities do this?


Anonymous Anonymous, modified 5 Years ago.

RE: How to view parameter (*.par) file?

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi Justin,
To add to Arjen's answer, here is some information to build/adapt your own tool.
The PAR-file created by default by DelWAQ GUI contains information regarding 2 space-varying parameters: SURF and BOTTOMDEPT.
Both parameters are (usually?) constant over time, and identical for all layers. Therefore in the PAR-file, only their values at TIME=0 and LAYER=1 is given, yielding:
  • 4bytes INTEGER containing a (dummy zero) timer
  • 4bytes FLOAT for SURF in segment 1
  • 4bytes FLOAT for BOTTOMDEPT in segment 1
  • 4bytes FLOAT for SURF in segment 2
  • 4bytes FLOAT for BOTTOMDEPT in segment 2
  • etc.
    for as many segments as you have in one layer (NB: the number of segments can be deduced from the file size). FYI, see attached an example written in MATLAB to convert the PAR-file into an ASC-file.

    @Arjen: I would also be interested in getting this tool you mentioned to easily convert the PAR-file into a MAP-file. Many thanks!

  • Attachments:

    Arjen Markus, modified 5 Years ago.

    RE: How to view parameter (*.par) file?

    Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
    I have attached the source code of the program - it is undocumented as I said, but it is not that difficult to read. It is part of the broad collection of tools that have been written over the years, especially by Jan van Beek, We should perhaps make an effort in standardising, modernising and documenting them.


    Arjen Markus, modified 5 Years ago.

    RE: How to view parameter (*.par) file?

    Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
    Not that I am aware of - at least not directly. The thing is that these files do not contain any meta-information such as the number of grid cells and parameters contained in them. However, if you know these things you could add a header to the file and turn it into a map file, which can be viewed with the regular graphical programs.

    As it happens, we do have a utility that will do just that emoticon. Are you on a Windows platform? Then I can send it directly to you, otherwise I can send you the source code. Mind you: there is no documentation beyond the source code for this.