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Network simplification

Explore dual-drainage concept in urban flood modeling with 1D/1D and 1D/2D models. Learn about sewer system components, overland flow paths, DEM-based network simplification strategies, and time reduction in simulation.

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Network simplification

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  1. 1D/1D dual-drainage simulation Network simplification

  2. DEMs and Urban Flood Modelling • Dual-drainage concept (1D/1D and 1D/2D) • Sewer system (manholes and pipes) • Overland system (depressions and flow paths)

  3. Overland system • 1D overland flow modelling • Overland system consists of nodes (ponds) andlinks (flow paths), generated using DEM. • 2D overland flow modelling • Surface divided into small elements (squares orirregular triangles), the flow equations (St. Venant) are based on terrain characteristics derived from the DEM.

  4. Network simplification strategies • Pruning: <10m; <300mm • Merging: similar hydraulic capacity - difference in dimension of consecutive links <100mm • First strategy • Simplifications are applied to the sewer network and the overland network simultaneously (1D/1D model) • Second strategy • Simplifications are applied first to the sewer network and then to the 1D/1D model network, i.e. including the overland flow network

  5. Preliminary results: network simplification

  6. Preliminary results: simulation results and time reduction

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