Geomorphological Characteristics of Istrian Contact Krast

Abstract

U radu se istražuju geomorfološka obilježja kontaktnog krša Istre kao specifičnog tipa reljefa razvijenog na kontaktu propusnih krednih vapnenaca i nepropusnih eocenskih flišolikih naslaga. Rasprostranjenost kontaktnog krša utvrđena je korištenjem listova Osnovne geološke karte, georeferenciranih topografskih karata i digitalnog modela reljefa. Promatrani tip reljefa se u prostoru očituje slijepim i suhim dolinama te ponorima kojih je prema topografskoj karti utvrđeno devet. Kontaktni krš Istre može se podijeliti u dvije odvojene zone. Prva zona vezana je uz Bujski krš, dok se druga veže u Pazinsku jamu. U radu su prikazani osnovni statistički podaci o promatranim ponorima, opća morfometrija Istre, morfometrija izdvojene zone istraživanja te neki od hidrogeografskih podataka. Terenskim radom istraženi su ranije pronađeni ponori i njihove slijepe doline, a kao produkt terenskog rada napravljene su geomorfološke karte područja oko ponora.This paper deals with geomorphological characteristics of Istrian contact karst as a specific type of relief which if found on the contact of cretaceous limestones and Eocene flysch like sediments. Distribution of contact karst is established by using Main geological map, georeferenced topographic maps and digital elevation model. This type of relief is presented by blind and fossil dry valleys as well as sinkholes. According to the topographic map, nine sinkholes were found. Istrian contact karst can be divided in two separate zones. The first one is associated with Bujski karst, while the second zone associates with Pazinska jama. Paper gives basic statistical facts about examined sinkholes, general morphometric data about Istria as well as specific morphometric data about examined contact karst zones and some hydrogeographical information. During the field work, previously found sinkholes and their blind valleys were examined and as a final product, geomorphological maps of area around sinkholes were made