Holocene high floods on the Planina Polje, Classical Dinaric Karst, Slovenia

The Planina Polje is located in the northwestern part of Notranjsko Podolje, Slovenia. Annual floods cover the flattened floor of the polje at elevation 445 m a.s.l. and reach the depth of approximately 8 meters. Loamy sediments which were found on surface and subsurface features from the inflow part of Planina Polje up to the elevations of about 495 m a.s.l., indirectly show that floods in the past must have been much more extensive than the recent ones. Radiocarbon dating of flowstone layer from side passage Tiha Jama in Planina Cave revealed that the last such extreme floods appeared around 5,706 ± 49 BP. The time frame of the flood roughly corresponds with the Altithermal (8,000–5,000 BP). More humid mid-Holocene climate might be the main cause for the high floods on Planina Polje.Keywords: geomorphology, floods, radiocarbon dating (14C), Dinaric Karst, Planina Polje, Planina Cave

Alluvial Fans on Contact Karst: an Example from Matarsko Podolje, Slovenia.

Several types of contact karst are found within the Slovenian karst, but the most common is the ponor type, which usually appears between flysch and limestone. The most extensive contact of this type is in western Slovenia, in the area of Matarsko podolje, where a variety of typical contact karst depression features can be found. In the northwestern part of Matarsko podolje two types of alluvial fans occur. One alluvial fan has an active process of alluvial sedimentation on its surface and is distinct in shape, just like alluvial fans in fluvial geomorphic systems. The other type represents relict alluvial fans on contact karst. They are fan-shaped surface features in carbonate bedrock. Their formation is a result of the gradual removal of alluvial cover and the chemical denudation of carbonate bedrock on areas that were covered by alluvial fans. Geomorphological features and processes on alluvial fans, and the influences of alluvial fans on the development of contact karst have been investigated in detail

Rečni meandri na kraških poljih

Rečni meandri predstavljajo najpogostejšo tlorisno obliko nižinskih rek. Na (pre)oblikovanje rečnih meandrov na kraških poljih najizraziteje vpliva režim poplavnih voda. Poplave namreč narekujejo prostorsko-časovno conacijo meandrotvornih procesov, od česar zavisi obstoj meandrotvorno aktivne oziroma meandrotvorno pasivne faze razvoja meandrov. Šolski primer meandrov, nastalih zaradi delovanja in součinkovanja preučevanih meandrotvornih procesov, predstavljajo meandri Dobravke na Radenskem polju

Reliktni vršaji kontaktnega krasa severozahodnega dela Matarskega podolja = Relict alluvial fans of northwest part of Matarsko podolje

Several types of contact karst are found within the Slovenian karst, but the most common isthe ponor type, which appears between flysch and limestone. The most extensive contact ofthis type is in western Slovenia, in the area of Matarsko podolje, where a variety of typicalcontact karst depression features can be found. Relict alluvial fans on contact karst are theresult of the gradual denudation of alluvial cover from flysch and chemical denudation ofcarbonate bedrock in the area of alluvial fans. Geomorphologic features and processes onalluvial fans, and the influences of alluvial fans on the development of local karst have beeninvestigated in detail

Reliktni vršaji kontaktnega krasa severozahodnega dela Matarskega podolja

Na slovenskem krasu je več različnih tipov kontaktnega krasa. Najpogostejši je ponorni tip kontaktnega krasa, ki se pojavlja med fliši in apnenci. Najdaljši kontakt te vrste v Sloveniji je na območju Matarskega podolja v zahodni Sloveniji, kjer se pojavljajo mnoge kraške globeli, ki so značilne za kontaktni kras. Reliktni vršaji so značilne oblike kontaktnega krasa, ki nastanejo s postopno denudacijo flišne naplavine in kemično denudacijo karbonatne podlage na območjih vršajev. V raziskavi so bile proučene oblike in procesi na vršajih ter vpliv vršajev na razvoj okoliškega krasa