Using ReFH2 to Generate TUFLOW Boundary Inputs: Difference between revisions
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[[File:New Project.png|800px]]<br>
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Use the ‘Import from file’ option to import the XML files. Importing the xml file will populate the parameters. The XML data can be catchment values or point data
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[[File:Point_Descriptors.png|800px]]<br>
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Once an area value has been provided then it is possible to generate the rainfall hyetographs and runoff hydrographs and apply to TUFLOW in the same manner as for catchment descriptors.
The user will then choose which country the data corresponds to. The ReFH2 programme included the development of Scotland specific algorithms to estimate the model parameters from the catchment descriptors. The choice of Scotland will mean that the alpha correction factor is not applied.
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[[File:Catchment_Descriptors.png|800px]]<br>
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Once the parameters have been imported, and the country specified, apply the parameters and choose to move to the next page. On the next page you can choose which rainfall model to use, FEH1999 or FEH2013. It’s possible to specify the design rainfall return periods of interest and ReFH2 will automatically calculate the recommended duration and suggest an appropriate timestep that meets the requirement that the duration must be an odd multiple of the time step. The recommended duration should normally be used, although both values can be edited directly to provide the duration that is required. The XML file from the FEH2013 website contains the rainfall depths for a number of pre-defined return period/duration combinations. For those return period/duration combinations that are not pre-defined, ReFH2 undertakes a two-way interpolation process. ReFH2 will then generate the design rainfall hyetograph based on the rainfall depth and the FSR approach.
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It is also possible to apply the total runoff to a 1D or 2D point or line using the 1D_BC or 2D_BC layers. The user can, if desired, split the total runoff by applying the direct runoff component to one model location and the baseflow component to another location.
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=Using TUFLOW Events=
In most applications there will be a requirement to run a number of return period design events, potentially with a number of different durations. TUFLOW’s event options makes the management of these simulations a simpler process. TUFLOW’s event management structure uses a variety of wildcard characters in the TCF file and the boundary condition database for event inputs. The wildcards are replaced with user defined event specific acronyms when a simulation is run from a batch file. This will significantly reduce the number of repetitive files required to execute a project. TUFLOW event management is shown in the following image.
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