The Kanin massif is an important trans-boundary aquifer, which stretches between Slovenia and Italy. The groundwater is only partially exploited, mainly for water supply, but the aquifer exhibits great potential for future exploitation. Since no consistent regional overview of the hydrogeological functioning of the Kanin massif was available, the decision was made to perform a study of this area, using a pragmatic approach based on 3D geological and hydrogeological modelling. The so-called KARSYS approach was applied, with the aim of characterizing the groundwater reserves within this karst massif, and of locating the main drainage axes which carry groundwater from the recharge areas to the respective springs.Delineation of the catchment areas of the corresponding springs was carried out, and some new explanations were obtained, especially with regard to the Možnica spring, which is located in Slovenia and forms a potential source of drinking water. It was found that this spring's catchment area extends as far as the Italian ski resort of Sella Nevea. The conceptual model also provides a possible explanation about the underground drainage toward the Boka spring and waterfall, which has been a challenge for decades. This new explanation is based on the existence of a perched groundwater body, which feeds the Boka spring via a system of conduits. Despite some limitations, the results, which consist of a visualization of the underground drainage and groundwater storage within the Kanin massif, can be used as a basis for planning the sustainable management of karst waters in the studied area.

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IzvlečekUDK 911.2:551.435.8 Tadej Slabe, Asami Hada & Martin Knez: Laboratorijsko modeliranje kraških pojavov in njihovega skalnega reliefa na mavcu: podtalne škraplje, dežni žlebiči in jame Proučevanje oblikovanja in razvoja kraških pojavov in njihovega skalnega reliefa z laboratorijskim modeliranjem z mavcem se je spet izkazalo kot koristno in povedno. Nadaljevali smo s proučevanjem podtalnih škrapelj, ki se oblikujejo pod tesnim, slabo prepustnim stikom s prstjo in dežnih žlebičev, ki se oblikujejo z vodo različnih temperatur. Razbrali smo način oblikovanja mavčnih cevi, ki so širše na pritočni kot odtočni strani. Izsledki so pomemben prispevek k razlagi oblikovanja visokih stropnih niš in kotlic v kraških jamah. Tretji poizkus smo izvedli v freatičnih pogojih, ko se je voda pretakala med plastmi različne sestave. Opazovali smo značilen razvoj kanalov med ploščami čistega mavca (apnenčasta plast), med ploščami mavca z dodanimi in s cementom učvrščenimi počasneje topnimi klasti (breča), siporeksom (slabo topna kamnina) in med tremi različnimi ploščami. Ključne besede: laboratorijsko modeliranje, kras, skalni relief, podtalne škraplje, žlebiči, jame. The study of the formation and development of karst phenomena and their rock relief using laboratory plaster modeling has again proven useful and informative. we continued the study of subsoil karren that forms under tight, poorly permeable contact with soil and of rain flutes formed by water at various temperatures. we determined the pattern of the reshaping of plaster tubes that are wider at the flow inlet than at the outlet end. The results are a significant contribution to explaining the formation of high ceiling niches and pockets in karst caves. The third experiment was carried out in phreatic conditions where water in a flume was forced to flow between layers of different composition. During the experiment, we observed the typical development of channels between pure plaster layers (uniform limestone beds), between plaster layers with added Portland cement reinforced fragments (breccia beds), siporex (slowly dissolving beds) and between three different layer types. Key words: laboratory modeling, karst, rock relief, subsoil karren, rain flutes, caves.ACTA CARSOLOGICA 45/2 -2016 TADEJ SLABE, ASAMI HADA & MARTIN KNEZThe modeling of karst phenomena and their rock forms and relief in plaster exposed to different factors in a variety of conditions has often proved useful. The limitations and particularities of plaster modeling often originate in the fact that in most cases the models are smaller than the original phenomena in nature and that more plaster dissolves (more than 2 g of plaster dissolves per 100 g of water at 20 °C). The consequence of the latter is that the forms on plaster are typically smaller than those on limestone and their development cycle is much faster. According to our experience, however, they provide a very useful comparison. Modeling offers various possibilities for the continuous monitoring of the origin and development of rock forms. w...