intro story D-Flow FM


D-Flow Flexible Mesh

D-Flow Flexible Mesh (D-Flow FM) is the new software engine for hydrodynamical simulations on unstructured grids in 1D-2D-3D. Together with the familiar curvilinear meshes from Delft3D 4, the unstructured grid can consist of triangles, pentagons (etc.) and 1D channel networks, all in one single mesh. It combines proven technology from the hydrodynamic engines of Delft3D 4 and SOBEK 2 and adds flexible administration, resulting in:

  • Easier 1D-2D-3D model coupling, intuitive setup of boundary conditions and meteorological forcings (amongst others).
  • More flexible 2D gridding in delta regions, river junctions, harbours, intertidal flats and more.
  • High performance by smart use of multicore architectures, and grid computing clusters.
An overview of the current developments can be found here.
The D-Flow FM - team would be delighted if you would participate in discussions on the generation of meshes, the specification of boundary conditions, the running of computations, and all kinds of other relevant topics. Feel free to share your smart questions and/or brilliant solutions! 


We have launched a new website (still under construction so expect continuous improvements) and a new forum dedicated to Delft3D Flexible Mesh.

Please follow this link to the new forum: 

Post your questions, issues, suggestions, difficulties related to our Delft3D Flexible Mesh Suite on the new forum.





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


Message Boards

How to calibrate astronomic tide forcing components?

Esther Espinoza, modified 2 Years ago.

How to calibrate astronomic tide forcing components?

Padawan Posts: 25 Join Date: 4/6/17 Recent Posts
Hi everyone,

I'm modelling water level for an estuary just for a month. I am using water level with astronomic forcing as the open boundary. I just have two things, the astronomic components (amplitude, phase) for my open boundary and the observed time series data for the month I'm interested in. I'm not sure how to calibrate the armonic components, since I don't have the corrections or other data. Is there a simple way to calibrate this data? Maybe with statistic?

Thanks for all the help!
Emiel Moerman, modified 2 Years ago.

RE: How to calibrate astronomic tide forcing components?

Padawan Posts: 84 Join Date: 3/10/11 Recent Posts
Hi Ester,

What you should do is convert both the modelled and measured water level time-series into astronomic components as well for comparison/calibration.
Following the comparison you can correct the open boundary astronomic forcing components (making use of a *.cor file in addition to the *.bca file) and/or changing bed roughness, and/or if necessary the model bathymetry to improve your model results.

For the tidal harmonic analysis of your measured and modelled water level data you can use for example the matlab toolbox t_tide or Delft3D-TIDE (as part of the Delft3D suite).