The UNMIX project (see post here) has its first preprint available at arXiv.

Daniel Bittner, Steven Mattis, Barbara Wohlmuth, Gabriele Chiogna and I prepared a document on the calibration of parameters for a lumped karst aquifer model by discharge data. We used the active subspace method to study the degree at which the parameters (more precisely, the directions in the parameter space) are informed by data.

I have to thank all the contributors for putting much effort in this preprint. I am looking forward in continuing and refining the research with these guys.