Benchmark study of numerical model grids to study historic floods of the river Rhine

Anouk Bomers, Ralph Mathias Johannes Schielen, Suzanne J.M.H. Hulscher

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Up until now, structured curvilinear grids are commonly used for hydraulic modelling. However, this grid type has several disadvantages such as staircase representations along closed boundaries and unnecessary high resolution in sharp inner bends. A so called ‘flexible mesh’ can overcome these limitations, since different shapes of grid cells can be used. However, model performance is not directly clear. Several different grid types are compared based on model performance and computation time. This shows that an unstructured grid with curvilinear grid cells in the summer bed and triangles in the floodplains is the most appropriate mesh for 2DH hydraulic modelling. A curvilinear grid in the summer bed ensures high resolution in the channel cross direction, while less grid cells are needed compared to a complete triangular grid. This has a beneficial effect on computation time.
Original languageEnglish
Publication statusPublished - 28 Jun 2017
Event4th International Symposium on Shallow Flows, ISSF 2017 - Eindhoven University of Technology, Eindhoven, Netherlands
Duration: 26 Jun 201728 Jun 2017
Conference number: 4


Conference4th International Symposium on Shallow Flows, ISSF 2017
Abbreviated titleISSF 2017
Internet address


  • historic floods
  • curvilinear grid
  • flexible mesh
  • model performance

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