Delft3D Flexible Mesh – River modelling

This river modelling course is intended for Delft3D Flexible Mesh (Delft3D FM), Delft3D 4 and SOBEK 2 users. Delft3D FM is the next generation simulation software package for evaluating and forecasting hydraulic functioning of rivers under normal, extreme and exceptional conditions, and the successor of Delft3D 4 and SOBEK 2. During this three-day course, we will address key functionalities such as: 2D river hydraulics, 1D river hydraulics, river induced flooding, river morphodynamics, and using Real-Time Control and Python scripting.

Course background

This course focuses on hydraulic behaviour in rivers. Following a stretch of the Dutch river Waal, we will cover the basic functionalities required in consulting projects.

You will learn how to set-up and work with a model in 2D Flexible Mesh for accurate computations and a 1D grid for fast computations. In this course we will introduce you to some of the similarities to both modelling approaches. We will address Real-Time Modelling of movable structures and give a brief introduction to the Python scripting functionality. We will also show how to model dike overtopping with the new horizontal coupling of 1D and 2D models in Delft3D FM and give an outlook on future functionality regarding flooding studies. On the third day of this course, we will give an introduction to modeling of river morphodynamics and sediment transport with Delft3D Flexible Mesh (in 2D).

At the end of this intensive course, you have made your own model and applied the advanced functionality of Delft3D FM, which you can use for future reference in your projects.


Day 1: 2D hydrodynamics

  • introduction to software and theory
  • getting familiar with 2D modelling of river hydrodynamics
  • grid generation and set-up of 2D models
  • Real-Time Control
  • visualizing results

Day 2: 1D and 1D2D hydrodynamics for river induced flooding

  • set-up of 1D models
  • brief introduction to Python scripting
  • horizontal coupling of 1D and 2D models for river induced flooding
  • outlook on future 1D2D functionality for river, polder and urban flooding

Day 3: 2D modelling of river morphodynamics and sediment transport


Experience with river hydraulics and modelling is recommended.


This course is part of the Delft Software Days – Edition 2018 (DSD-INT). You can register for this course via the DSD-INT website.