Morphogenesis of the karst relief in the area of Družanica and Drenovača (Western Medvednica)

Cilj istraživanja je doprinijeti poznavanju površinskog i podzemnog krškog reljefa na području Družanice i Drenovače (Zapadna Medvednica) sa svrhom razumijevanja njegove morfogeneze. Metode rada obuhvaćaju opću i specifičnu morfometrijsku analizu, usporedbu reljefa s geološkom građom odabranog područja te geospeleološku analizu. Kao izvori podataka poslužili su digitalni model reljefa, topografske i geološke karte te podaci iz speleološkog katastra Republike Hrvatske. Reljef na tom području oblikovan je kroz tri faze. Prva faza je razvoj površinske drenažne mreže koja usijeca doline. Drugu fazu karakterizira okršavanje čijim napredovanjem dolazi do razvoja podzemnog otjecanja stvarajući područja ponornih zona, ponikve i speleološke objekte. Treća faza rezultirala je daljnjim napredovanjem procesa iz druge faze te stvaranjem recentnog reljefa.The aim of the research is to contribute to the knowledge of surface and underground karst relief in the area of Družanica and Drenovača (Western Medvednica) with the purpose of understanding its morphogenesis. Methods of work include general and specific morphometric analysis, comparison of relief with geological structure of the selected area and geospeleological analysis. Digital elevation model, topographic and geological maps and data from the speleological cadastre of the Republic of Croatia were used as sources of data. The relief in this area was formed through three phases. The first phase is the development of a surface drainage network that creates valleys. The second phase is characterized by karstification, whose progression leads to the development of underground runoff, creating areas of sinking zones, sinkholes and speleological objects. The third phase resulted in the further progress of the processes from the second phase and the creation of the recent relief