How to explain and predict the shape parameter of the generalized extreme value distribution of streamflow extremes using a big dataset

The finding of important explanatory variables for the location and scale parameters of the generalized extreme value (GEV) distribution, when the latter is used for the modelling of annual streamflow maxima, is known to have reduced the uncertainties in inferences, as estimated through regional flood frequency analysis frameworks. However, important explanatory variables have not been found for the GEV shape parameter, despite its critical...