Tutorial Module04 Archive: Difference between revisions
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==1D Channels==
Now that we have looked at the cross section data, we must add 1D channels for the 1D network. In TUFLOW, cross sections can either be located at the ends of each channel reach, or at some point along the reach. The way that TUFLOW uses the cross-section depends upon the location, for example a "centre" cross-section has a higher priority than "end" sections if both "End" and "Centre" sections are defined. For more information on the 1D topography,
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For this tutorial, we will locate most of the cross-sections at the ends of channels. There are a number of locations where a "centre" section will be used. The final channel will be a weir type channel; this represents a weir with a known stage-discharge curve. In later modules we will also use "centre" cross sections for the modelling of structures.<br>
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==1D/2D Links==
In this section we define lines where there is flow exchange between the 1D and 2D components of the model. At first it may seem slightly complicated, but it is actually very logical and the method allows the user to change the 2D cell size and orientation at a later stage without having to change the 1D/2D linking. Before we begin creating the link we will spend a bit of time describing how the link works. More details on the 1D/2D link can be found in
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'''Description of linking concept'''<br>
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[[File:Tute M04 results no 1d 02.jpg|500px]]
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If you look at the 1D results (by importing the time series (_TS.mif or _TS_P.shp from the 1D results folder, or opening the M04_5m_001_1d_Q.csv) the 1D channels are conveying flow. In order to get map output for the 1D we need to use Water Level Line (WLL) inputs. The underlying water level from the 1D model is displayed across this line and as such it should be digitised perpendicular to flow. The theory behind water level lines and their use is detailed in the
<li> For the purpose of this tutorial the 1D_WLL GIS inputs have been provided for you.<br>
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