Parameter optimisation, XNS11 Parameters

The Manning numbers specified in the XNS11 file  can be auto-calibrated through use of the feature "Resistance Number Interpolation…" found in the "Cross Section" menu of the cross section editor. The data specified in this table are saved in a separate file with the same name as the .xns11 file but with extension .xns11r. This is an ASCII file as required for auto-calibration.

We want to calibrate the Manning's n at three chainages (0, 55970 and 108080) and interpolated values should apply in-between.

The maximum water levels are measured at chainage 27395 and 76810 dur­ing two flood events. Measured data are stored in ac-obs-peak1.dfs0 and ac-obs-peak2.dfs0. Each file contains two items (one for each location) but there is only one value in each item and this is the measured maximum water level during each of the periods covered by the file. The remaining values are delete values.

The measured maximum water levels are artificial and obtained by running the model with Manning’s n values of, respectively, 0.05, 0.04 and 0.03 at the three chainages. The setup for generation of the artificial measurements is included in the subfolder Measurements.