QGIS ReFH2 to TUFLOW: Difference between revisions

Once the relevant location specific data has been input, then the user should first pick the ReFH2 model that they would like to use. The 'legacy' 2.2' and newer 2.3 ReFH2 models are available. In order to use the ReFH2.3 model use of the ReFH2.3+ descriptor files, containing a new BFIHOST19 parameter, are required. If ReFH2.2 parameters are used with the ReFH2.3 engine, an error message will be flagged. The user is then required to pick the events that they are interested in. The user can select from a number of pre-determined return periods or specify their own. All return period boundary conditions will be output in a single csv file for use as a TUFLOW boundary condition.

An error will be shown if the duration is not an odd multiple of the timestep value. It is now possible to selectgenerate multiple Return Period-Duration sets.hyetographs and Eachhydrographs durationat andonce seasonalwith profilethe ReFH2 to TUFLOW tool. Each duration will result in a separate output file containing the selected return periods.

Climate Change can also be specified for each of the selected return periods. This requires the addition of a climate change factor. The factor is used to uplift the rainfall in the ReFH2.3 engine from which runoff and baseflows are generated, it is not used to uplift flows directly. itThe climate change factor is not used when specifyingusing the ReFH2.2 model. A factor of 1.3 will provide a 30% uplift to the rainfall. Climate change factors are reported in the output hyetographs or hydrographs headings, for example, 'Total flow m3/s (10 year 1.2 CC) - as 100% rural model'.

Finally, the user will select whether to use the summer or winter profiles. These are described in the FEH Supplementary Report No. 1 FEH Supplementary Report No. 1. Note the selection of the winter/summer profile will override the values automatically selected by the ReFH2 engine. This is important to note when comparing outputs to ReFH2 particularly for urban areas. 2. When using an urban area, ReFH2 automatically changes the profile type when the URBEXT2000 is ≥0.3 or 0.15≤Urbext2000 and BFIHost is ≥0.65. The user will need to ensure the correct season profile is used in the ReFH2 to TUFLOW tool. Each seasonal profile will require generating separately and will generate it's own csv file.