1. Ph.D. Candidate, Dept. of Geography and Geology, Paris-Lodron-Univ. Salzburg, Hellbrunnerstraße 34, A-5020 Salzburg, Austria (corresponding author).
2. Professor, Dept. of Geography and Geology, Paris-Lodron-Univ. Salzburg, Hellbrunnerstraße 34, A-5020 Salzburg, Austria.