Network simplification

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# Network simplification - PowerPoint PPT Presentation

1D/1D dual-drainage simulation. Network simplification. DEMs and Urban Flood Modelling. Dual-drainage concept (1D/1D and 1D/2D) Sewer system (manholes and pipes) Overland system (depressions and flow paths). Overland system. 1D overland flow modelling

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## PowerPoint Slideshow about 'Network simplification' - ina

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