Neven Bočić

• University of Zagreb

Opposite to atmospheric CO2 concentrations, which reach a minimum during the vegetation season (e.g., June-August in the Northern Hemisphere), soil CO2 reaches a maximum in the same period due to the root respiration. In karst areas, characterized by high rock porosity, this excess CO2 seeps inside caves, locally increasing pCO2 values above 1%. To...

Prvić Island (Kvarner area in the NE channel part of the Adriatic Sea) is a part of the Natura 2000 protected area network. A recent tombolo is located on the SW coast of Prvić Island, and much larger submerged tombolos are located on the shoal towards the south. Both phenomena are unique to the Croatian coast of the Adriatic Sea. The inland part o...

The last populations of Danube salmon (Hucho hucho) in Croatia are found in the Kupa and Una Rivers; however, the size of the suitable area that could serve as the best spawning ground for the remnant Danube salmon population in these rivers is not known. The study aimed to leverage anglers' experiences to determine the sections of the Una and Kupa...

The formation of karst landscapes is the result of a series of processes, whereby rock weathering and denudation play important roles. Soluble carbonate rocks are chemically weathered (dissolved) on the surface or under soil cover resulting in the formation of different karst morphologies and controlling surface denudation. The Dinaric karst area i...

Samograd Cave is located on Grabovača hill in Perušić (Lika region, Croatia) at 684 m a.s.l. It features a simple morphology with a single entrance and a single, up to 32 m high, up to 30 m wide and 346 m long passage that is descending to the depth of 53 m and then ascending to the last part where the bottom is at the level of entrance line. The e...

Monografija Fizička geografija Hrvatske, prirodno-geografska osnova razvoja, druga je knjiga u nizu sveobuhvatnog opusa Velike geografije Hrvatske. Ovo reprezentativno izdavačko ostvarenje na više od 700 stranica obrađuje prirodno-zemljopisna obilježja prostora Republike Hrvatske, od geološke građe i seizmičkih pojava, preko reljefa, klime, voda i...

Karst areas are generally disadvantaged for traditional farming due to limited water availability, poor soils and topographic difficulties. Therefore, their population density has always been lower throughout history than in other landscapes. However , because of this fact, their natural vegetation has often remained in better condition than in oth...

Plitvice Lakes are a world-famous karst phenomenon. Their origin and development is a consequence of a specific geological structure and geomorphological processes. The aim of this chapter is to provide an overview of geoscientific knowledge about this area with additional data from recent research. This area belongs to the outer Dinarides, the lar...

U radu su istražene promjene u pružanju korita Drave od Repaša do Ferdinandovca u posljednjih 235 godina pod utjecajem prirodnih i antropogenih čimbenika. Duljina toka izmjerena je crtom sredine korita na temelju osam kartografskih izvora, uključujući karte vojnih izmjera iz razdoblja Habsburške Monarhije, topografske karte iz sredine i kraja 20. s...

U elaboratu je detaljno istraženo suburbano i ruralno područje Grada Zagreba. Predlažu se smjernice za oblikovanje razvojnih mjera. In the study, the suburban and rural areas of the City of Zagreb were studied in detail. Guidelines for the design of development measures are proposed.

According to geographic possibilism, environment does not determine socio-economic development. However, the environment sets certain constraints and limitations for development. How do natural settings influence population dynamics? In this study, we examine this question using the example of Šibenik-Knin County, which includes Krka National Park...

A strong earthquake of magnitude 6.2 with the epicentre near the town of Petrinja occurred on December 29th, 2020 in the fault zone of the right strike-slip Pokupsko Fault in Croatia. The aim of this study was to determine if there are geomorphological indicators of active tectonics in this area. General morphometric methods based on a digital elev...

We present the first stable isotope (δ13C and δ18O) speleothem record from continental Croatia retrieved from two coeval stalagmites from Nova Grgosova Cave. U-Th dates constrain the stalagmite growth history from 10ka to the present, revealing coeval growth between 7.8 and 5.6ka. We interpret δ18O as an autumn/winter hydrological proxy related to...

During archeological excavations in the Lower Cerovačka Cave (Mt. Velebit, Croatia), the test trench penetrated to a depth of 1.8 m. An undisturbed sequence of sediments was exposed. Considering that caves represent highly efficient sediment traps it was possible to recognize changes in the depositional mechanisms during the Pleistocene–Holocene pe...

The Significant landscape Risovac - Grabovača near Perušić in Lika is a geomorphologically and speleologically interesting area with numerous aesthetic, scientific and educational values. As part of the project of basic geomorphological and speleological research, without which it is not possible to qualitatively evaluate geodiversity and geoherita...

Geodetic benchmark displacement measurements following the 2020 Petrinjaearthquakein Croatia.

After the earthquake of 29/12/2020 in Petrinja (ML6.2, ImaxVIII-IX EMS), an attempt was made to characterize the active structure associated with the earthquake. As a first step towards this goal, we performed a geomorphological analysis in order to contribute to the identification and characterization of the surface expression of the active Pokups...

The Oštarije–Tounj area lies in the contact zone of two large geomorphological units: the Ogulin-Plaški basin and the Una-Korana plateau, along the northern edge of Dinaric karst in Croatia. This is a highly karstified landscape, with numerous surface and subterranean karst forms. The objective of this study was to determine the significance of the...

Speleothems deposited from cave drip waters retain, in their calcite lattice, isotopic records of past environmental changes. Among other proxies, δ18O is recognized as very useful for this purpose, but its accurate interpretation depends on understanding the relationship between precipitation and drip water δ18O, a relationship controlled by clima...

SAŽETAK U radu se kroz prikaz i analizu dijela ocjena hidromorfološkog monitoringa raspravlja o najčešćim zabilježenim promjenama erozijsko-sedimentacijskih procesa koje su posljedica ljudskih aktivnosti na tekućicama u Hrvatskoj. Prikazan je i relativan utjecaj tih ocjena na ukupnu hidromorfološku ocjenu vodnog tijela. Naglašena je važnost erozijs...

U članku se prikazuju geomorfološka obilježja područja sjevernog Velebita s posebnim naglaskom na Nacionalni park Sjeverni Velebit. Temeljne morfometrijske i morfogenetske analize nekad rađene analogno, načinjene su korištenjem digitalnih tehnologija te nadopunjene novim analizama i terenskim radom. Od općih morfometrijskih metoda korištene su hips...

Suburbs and rural areas around cities are considered to be the most dynamic parts of urban areas. Because of the introduction of new spatial elements and the intertwining of different functions in the service of the city, population and economy, these are areas of intense spatial transformation that have their reflection in the landscape. The state...

Od 2000. godine, kada je napisana prva knjiga „Speleologija“, došlo je do značajnih napredaka i otkrića. U znanstvenom pogledu, razvojem brojnih područja kao što su npr. znanost o sigama ili biospeleologija, speleološki objekti u Hrvatskoj postaju značajni na globalnoj razini kao izvori brojnih podataka o klimi i drugim procesima u geološkoj prošlo...

Organic material and a few tree trunks have been recovered from the shrinking ice deposits of Velebit Mountain, Croatia. Ten radiocarbon ( ¹⁴ C) dates, seven new measurements and three recalibrated ones, from three cave ice deposits were evaluated. The new data argue for the preservation of a ~1000-yr-old deposit in the Kugina Ice Cave and a <500-y...

Conducting hydromorphological assessments for evaluating the ecological status of rivers is a key requirement of the Directive 2000/60/EC (Water Framework Directive - WFD) within European Union (EU) Member States. This paper aims at understanding how this requirement was implemented, through an original comparative review of methodologies for river...

The middle section of the Kupčina river valley is listed as a natural asset that has been registered, and proposed to be designated as a protected area of the significant landscape category, in the spatial plan of Zagreb County. However, professional criteria for declaring such protected areas are not clearly defined. Therefore, the aim of this pap...

Determining the processes and conditions that control and affect the precipitation of carbonates in cave environments is essential to correctly interpret speleothem-based proxies and reconstruct past climate and environmental changes. Therefore, two cave systems rich in speleothems and that are located at different distances from the Adriatic Sea w...

The study covers the area of Zagreb Urban Agglomeration organized for more efficient planning, coordination and implementation of regional development policy.

Ice and snow caves are distributed throughout Croatia in the Dinaric karst mountain belt. Most of them are located on Velebit Mt., 1200. m. a.s.l. in the zone with snow (boreal) climate. In the past, some of them were used for ice excavation for water and conservation purposes. First mentions occurred in the 17th century and the first researches in...

Dolines are considered to be among the most prominent karst formations, which is why they can serve as diagnostic forms of karst. Their spatial distribution and density are important indicators of an area’s degree of karstification, as well as of an overall geomorphological development. The aim of this paper is to determine the spatial distribution...

Quaternary palaeo-environmental changes that have taken place in Croatia are likely to be recorded in speleothems – secondary carbonate deposits precipitated in caves. Confident interpretation of well dated speleothem proxy records relies on modern monitoring programs, which we provided in three regionally different caves. Parallel monitoring of th...

The explored area is about 4 km east of Slunj town at the region known as Kordun Karst. This location stipulated the specific condition for the formation of the speleological objects in the south area of Grabovac Valley. The Grabovac Stream flows from the north to the south through the Grabovac Valley connected to the canyon of the river Korana. Pa...

Dolines are considered to be among the most prominent karst formations, which is why they can serve as diagnostic forms of karst. Their spatial distribution and density are important indicators of an area's degree of karstification, as well as of an overall geomorphological development. The aim of this paper is to determine the spatial distribution...

Terenska nastava je nezaobilazan dio nastavnog procesa u geografiji. Najjednostavnije se može definirati kao način rada izvan učionice u kojem se za poučavanje i učenje koriste "iskustva iz prve ruke". Svi dionici nastavnog procesa će se složiti kako je to najefektniji oblik učenja i poučavanja, a to pokazuju i studije. Učiteljima pruža mogućnost r...

Slunjska uravnava je del kordunskega krasa. Ta se razteza v nad. viš. 300-350 m, od najdlje proti zahodu segajočega dela doline Une do sotočja Slunjčice in Korane. Dolga je 40 in povprečno 10 km široka. Večji del te uravnave, zgrajene iz jurskih in krednih karbonatnih kamnin, ima značilnosti kraškega reliefa s številnimi vrtačami. Na manjšem delu,...

Osrednji del slunjske kraške planote gradi prepustni zakraseli gornjekredni apnenec. Na njem leže v transgresijskem stiku denudacijski ostanki miocenskih peščenjakov in laporjev. Ta del površja je neprepusten z značilnostmi fluviodenudacijskega reliefa. Z morfološkega vidika je pomembna slepa dolina ponikalnice Džedinovac. Potok ponika na stiku mio...

Speleologija je skup aktivnosti vezanih za pronalaženje, istraživanje, snimanje, dokumentiranje, zaštitu i korištenje speleoloških objekata. Područje Karlovačke županije je na prijelaznom geografskom položaju između Panonskog bazena i Di-narskoga gorskoga sustava. Najveći dio županije izgrađen je od karbonatnih stijena mezozojske starosti te je na...

Ponikve pripadaju među najznačajnije krške oblike koji se stoga smatraju i dijagnostičkim oblicima krša. Njihov prostorni raspored i gustoća važan su pokazatelj stupnja okršenosti nekog prostora, ali i njegova cjelokupnoga geomorfološkog razvoja. Cilj ovoga rada je utvrditi prostorni raspored i gustoću ponikava te analizirati utjecaj geološke građe...

Geomorfologija istražuje značajke, nastanak, razvoj i suvremenu dinamiku reljefa Zemlje. U ovom je radu opisan pregled temeljnih obilježja reljefa Karlovačke županije sa specifičnim geomorfološkim položajem na prijelazu iz Panonskog bazena u Dinarski gorski sustav. Uz pregled osnovnih geoloških i klimatskih uvjeta razvoja reljefa istražene su i pri...

Jama Provala, 1687 m dolga in 55 m globoka, razvita v dveh nivojih, se odpira v fluviokraškem svetu Žumberačke gore (SZ Hrvaška). Skozi spodnji nivo teče stalni vodni tok. Zgornji nivo je, glede na vodne značilnosti, mogoče razdeliti na tri dele: 1. južni s stalnim vodnim tokom, 2. del z občasnim vodnim tokom in 3. suhi del. V zadnjih dveh delih, k...

Karst plateaus often have a complex geological and geomorphological history. It is widely accepted that their development requires a long period of karst denudation. This study reconstructs the palaeodrainage network of a karst plateau, analyses its properties and establishes its geomorphological significance. The main purpose of this research was...

U radu se prikazuje istraživanje drenažne mreže prostora Papuka, uključujući i njegov zapadni dio – Ravnu Goru. Drenažna mreža derivirana je iz DEM-a rezolucije 30 x 30 m. Izračunata je i kartografski prikazana gustoća drenažne mreže. Zatim je izrađena klasifikacija tokova prema Strahleru te su izračunati indeksi bifurkacije i indeksi dužina za sve...

Despite the frequent reports about their shrinkage, detailed survey of the major subterranean ice deposits is still lacking in Croatia. Here we present cave maps and detailed description of cave ice accumulation from five caves of the Velebit Mt. Morphological constraints allowed ice volume estimation for four of them. Ice volumes were estimated as...

The research of cave microclimate in general contributes to a better understanding of physical and chemical processes in complex karst geoecosystems. Special challenges for researchers are ice caves. The ice contains various fossil, geomorphological and chemical records of the past that can be used for research of former processes or creating...

Fizičkogeografska studija doline rijeke Kupčine u Zagrebačkoj županiji U radu su obrađena fizičkogeografska, geomorfološka i geoekološka obilježja doline rijeke Kupčine u Zagrebačkoj županiji te je izvršeno geoekološko vrednovanje zemljišta za njegovo agrarno korištenje. Physical geographical study of Kupčina River valley in Zagreb County, Croati...

Within the task of geomorphological mapping and making of Geomorphological map of Croatia 1:100.000 in GIS environment, model of the geomorphological database and mapping data model were created. Spatial framework of geomorphological map series is related to the projection reference system HTRS96/TM based on ellipsoid GRS80. Division of map sheets...

This paper analyses for the first time the influence of glaciation on underground karst landforms in the Croatian part of the Dinarides, as well as the interrelation between underground and surface relief developments under glacial conditions. The karst environment, as a good recorder of palaeo-environments, provides some new information on Quatern...

This chapter deals with main geomorphological properties of Croatia. The key elements of the geological predispositions are outlined as well as those of geodynamic evolution which, in conjunction with numerous exogenous processes, result in recent landform development. The main points of all important exogenous processes and landforms are presented...

The 3H activity and the concentration of 23 metals and metalloids have been analysed in cave ice samples from the perennial cave ice deposit of Vukusic Ice Cave, Velebit Mt., Croatia. The results of tritium measurements exclude a secular age for the upper 2.4 m of ice deposition, and provide clear arguments that the sampled ice sequence consists of...

The 3H activity, 18O/16O and 2H/1H ratio and concentration of 33 metals and metalloids have been analysed on ice core samples from the perennial subterranean cave ice deposit of Vukušić Ice Cave, Velebit Mt. The tritium data suggested that the ice deposition at 2–2.4 m depth is build from precipitation fallen ~45 years before sampling and the upper...

The research goal has been to determine the basic conditions and processes of the relief formation and development, and to define its general geomorphologic characteristics on the area of the Slunj karst plateau, as an example of spacious plateaus of the Dinaric karst. Since geomorphological mapping is one of the most important methods of geomorpho...

Perennial ice is a common deposit in the caves of north Velebit Mts, Croatia. On the basis of historical cave maps ice level subsidence were estimated to 9 m and 0.2 m between 1962 and 2007 in Ledena Pit and Vukušić Ice Cave, respectively. The ice loss trend in Ledena Pit has seemed to slow down since the mid-1990s. Reassessment of the 1995-year tr...

Touristic valorisation of caves has long tradition in Croatia. Research has been conducted in order to: identify show caves in Croatia (13), make an overview of their basic geomorphologic characteristics and study their role as tourist destinations. Based on Nature Protection Law and current experiences, four different management models have been i...

The explored area is about 4 km east of Slunj town at the region known as Kordun Karst. This location stipulated the specific condition for the formation of the speleological objects in the south area of Grabovac Valley. The Grabovac Stream flows from the north to the south through the Grabovac Valley connected to the canyon of the river Korana. Pa...

Provala cave is located in the fluviokarst area of Zumberacka gora mountain (NW Croatia). This two-level cave is 1687 m long and 55 m deep. In the lower level there is a permanent water stream. The upper level, according to its hydrological characteristics, can be divided into three parts: 1. the southern part with permanent water stream, 2. the pa...