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10/01/2019 15:33:10

Until now, modelling conduits of irregular shapes or even channel sections covered with a “lid” in Flood Modeller required modellers to simplify their geometry, assume symmetric friction properties or use units other than conduits. However, this is about to change, as the new Asymmetric Conduit Unit in Flood Modeller v4.5 will be able to model any kind of conduit shape using both Manning’s and Colebrook-White formulas for friction.

To accommodate for any possible conduit shape was an interesting computational challenge but computer graphics concepts and computational geometry provided the solution! As the cross section is a polygon with no restriction on the dimension or shape apart from having no self-intersections, calculating the characteristics for any water level is not trivial. The shape (or shapes, as concave shapes are allowed) resulting from intersecting the original polygon with the water line is needed. To obtain this, a modified version of Sutherland–Hodgman algorithm is employed to get the clipped polygons and eventually undertake the calculations. In terms of implementation, to ensure the integration with the rest of the project and code efficiency, modern Fortran (with some object-oriented programming elements!) was used along with Intel® Math Kernel Library. The new feature will be available in Flood Modeller v4.5.

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