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25/09/2008 11:03:33

I need to feed a 2D independent model (not Tuflow unfortunately) with the flow hydrographs (flow(m³/s) vs time(min)) of the flows overtopping the embankments of the river units I am modelling with iSIS. So far the only idea I got is to run the 1D unsteady solution, then connect the glass walling river units to Floodplain (or Spill) units which would discharge into dummy reservoirs. And then query the Flow in the "Plot time series" of the Floodplain (or Spill) and save as csv files to pass to the 2D modeller. But this is quite a time consuming process and, in my previous experience, will introduce a lot of instabilities in a model where I already need 20m deep Preismann slots to have a run completed. Is there any other way of measuring the flow-time lost from a river unit when the bank is overtopped (i.e. avoid the glass walling)?


09/12/2008 11:50:18

This approach should work without necessarily producing instabilities - you will need very low and large dummy reservoirs (or simply low HTBDYs) and as such are assuming that the flow over the embankments remains modular and unconstrained by downstream water levels in your 2D model. Otherwise the river and floodplain are dynamically linked (they generally are) and your strategy won't produce the correct answers. I would be a very worried about the need for 20m deep Preissmann slots if it were me....


22/01/2009 17:26:15

Rather than using plot time series it would be better to output data using TabularCSV with a prefined list of spills that you want the flow from in an *.lng file. You can maybe save a bit more time by saving the setup of the tabular in a *.tcs file and extract the data you need during a batch run. The instabilities issue is something you need to sort out anyway and it is worth checking that the spills are sensibly stable even if the model is not showing a problem before inputting to a 2D model.

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