ACKNOWLEDGEMENTS
This work was co-funded by the Austrian Federal Ministry of Agriculture, Regions and Tourism (former Federal Ministry of Sustainability and Tourism) and the Federal States of Vorarlberg, Tyrol, Salzburg, Styria and Carinthia within the DaFNE projects RGHeavyMetal (Nr. 101093) and RG-AlpCatch (Nr. 101561). Digital elevation models were provided by the GIS Service of the Federal Government of Tyrol.