Why use 1D urban modelling?
    • 13 Sep 2022
    • 1 Minute to read
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    Why use 1D urban modelling?

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    Article summary

    In 1D urban modelling, urban nodes and links are used in unison to specify the underlying pipe drainage system. 1D modelling can also be utilised to define volumes of floodplain flow, however it won’t detail the pathways taken by these flows.

    What is needed to run a 1D urban simulation?

    A 1D simulation always requires a network to represent the 1D components. When modelling a pipe drainage system, a 1D urban network describes the system itself.

    An urban network consists of multiple nodes and links to describe the system – nodes provide properties including inflow and outflow (how water enters and leaves the pipe system) and links provide pipe geometry and other details, allowing water to flow between nodes.

    To set up 1D urban simulations, details of timing and run-type must be provided alongside other simulation options. Climatology inputs can also be specified . Urban simulations can be run individually, or in batches.

    Multiple parameters can be calculated in a 1D urban simulation including the depth, head and volume at all nodes and links.

    What can I visualise from a 1D urban simulation?

    Flood Modeller’s graphical interface provides the ideal platform for visualising all aspects of your model, both throughout the build process, and for result analysis and processing. Prior to running a simulation, the map view allows visualisation of all modelling components, together with background mapping. For 1D networks, this consists of unique icons identifying each node of the river or pipe system itself, together with links showing the connectivity of the network.

    Each node then has further visualisation options; for river nodes, buttons are provided to create ‘Cross Section’ and ‘Long Section’ plots from your river data, and inflows can be viewed in tabular or graphical form, for example.

    For urban nodes and links, similar functionality is provided. Buttons enable plotting data and visualisation of the underlying pipe geometry, alongside other options.

    Results from 1D urban simulations can also be visualised in multiple ways. In ‘Long Section’ plots, a “route” through the urban network is shown from specified start and end nodes, and animations can be viewed to see levels adjust over time. ‘Time Series’ and ‘XY Series’ plots are also available for viewing your urban results.

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