Network simplification - PowerPoint PPT Presentation

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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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Network simplification

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Presentation Transcript

1D/1D dual-drainage simulation

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