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1603. Groundwater Characterization by Means of Conservative (δ18O and δ2H) and Non-Conservative (87Sr/86Sr) Isotopic Values: The Classical Karst Region Aquifer Case (Italy–Slovenia)Chiara Calligaris, Kim Mezga, Francesca Federica Slejko, Janko Urbanc, Luca Zini, 2018, original scientific article Abstract: The study of the different hydrogeological compartments is a prerequisite for understanding and monitoring different fluxes, thereby evaluating the environmental changes in an ecosystem where anthropogenic disturbances are present in order to preserve the most vulnerable groundwaters from contamination and degradation. In many karst domains in the Mediterranean, areas groundwaters and surface waters are a single system, as a result of the features that facilitate the ingression of waters from surface to subsurface. This is also the case for the Classical Karst hydrostructure, which is a carbonate plateau that rises above the northern Adriatic Sea, shared between Italy and Slovenia. The main suppliers to the aquifer are the effective precipitations and the waters from three different rivers: Reka/Timavo, Soča/Isonzo and Vipava/Vipacco. Past and ongoing hydrogeological studies on the area have focused on the connections within the Classical Karst Region aquifer system through the analysis of water caves and springs hydrographs and chemographs. In this paper, the authors present new combined data from major ions, oxygen, hydrogen and strontium stable and radiogenic isotopes which have allowed a more complementary knowledge of the groundwater circulation, provenance and water-rock interactions. All the actions occurred in the framework of the European project HYDROKARST.
Keywords: podzemna voda, kras, geokemija, izotopi, Hydrokarst projekt
Published in DiRROS: 12.12.2023; Views: 312; Downloads: 173
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1604. Parametarska studija kolničke konstrukcije ojačane geoćelijamaSamo Peter Medved, Bojan Žlender, Stanislav Lenart, 2018, original scientific article Abstract: U radu je prikazano parametarsko ispitivanje kolničke konstrukcije ojačane geoćelijama. Analiza temeljena na metodi konačnih elemenata uključuje model neojačane kolničke konstrukcije te model kolničke konstrukcije ojačane geoćelijama, pri čemu se analiziraju razni položaji, debljine i čvrstoća geoćelija. U okviru modela određen je i očekivani vijek trajanja kolničke konstrukcije. Rezultati parametarskog proučavanja u skladu su s rezultatima analitičkih rješenja, laboratorijskih i terenskih ispitivanja. Dobiveni rezultati upućuju na bitno poboljšanje nosivosti, smanjenje debljine asfaltnih slojeva i povećanje trajnosti kolničke konstrukcije kada je ona ojačana geoćelijama.
Published in DiRROS: 12.12.2023; Views: 276; Downloads: 188
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1605. Atmosphere - vegetation - soil interactions in a climate change context; impact of changing conditions on engineered transport infrastructure slopes in EuropeAnh Minh Tang, P. N. Hughes, T. A. Dijkstra, Amin Askarinejad, Mihael Brenčič, Yu Jun Cui, J. J. Diez, T. Firgi, Beata Gajewska, F. Gentile, G. Grossi, C. Jommi, F. Kehagia, E. Koda, H. W. ter Maat, Stanislav Lenart, S. Lourenco, M. Oliveira, P. Osinski, Sarah Springman, Ross Stirling, D. G. Toll, Ursula J. Van Beek, 2018, original scientific article Abstract: In assessing the impact of climate change on infrastructure, it is essential to consider the interactions between the atmosphere, vegetation and the near-surface soil. This paper presents an overview of these processes, focusing on recent advances from the literature and those made by members of COST Action TU1202 - Impacts of climate change on engineered slopes for infrastructure. Climate- and vegetation-driven processes (suction generation, erosion, desiccation cracking, freeze-thaw effects) are expected to change in incidence and severity, which will affect the stability of new and existing infrastructure slopes. This paper identifies the climate- and vegetation-driven processes that are of greatest concern, the suite of known unknowns that require further research, and lists key aspect that should be considered for the design of engineered transport infrastructure slopes in the context of climate change.
Published in DiRROS: 12.12.2023; Views: 233; Downloads: 129
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1606. Heavy metal signature and environmental assessment of nearshore sediments: Port of Koper (Northern Adriatic Sea)Nastja Rogan Šmuc, Matej Dolenec, Sabina Dolenec, Ana Mladenovič, 2018, original scientific article Abstract: Heavy metal abundance and potential environmental risks are reported for surface sediments (n = 21) from the Port of Koper area, Republic of Slovenia. The enrichment factor (EF) indicates minor enrichment in arsenic (As), cadmium (Cd), copper (Cu), molybdenum (Mo), lead (Pb), antimony (Sb), and zinc (Zn), moderately to severely enriched with nickel (Ni). The trace metal chemistries, in the context of sediment quality guidelines (SQG), imply adverse threshold effect concentrations (TEC) and probable effect concentrations (PEC), for Ni only. Sediment sequential leaching experiments demonstrated that the majority of heavy metals were of natural lithogenic origin and low bioavailability. The heavy metals’ potential for “Risk Assessment Code” values exhibited no or low anthropogenic environmental burden, with the exception of Mo.
Keywords: port sediments, heavy metals, chemical speciation, risk assessment, Northem Adriatic Sea
Published in DiRROS: 12.12.2023; Views: 267; Downloads: 139
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1608. Preverjanje verjetnostne napovedi sanitarnega poseka smreke zaradi podlubnikov v Sloveniji v 2023Nikica Ogris, Maarten De Groot, 2023, other scientific articles Abstract: Preverili smo zanesljivost verjetnostne napovedi sanitarnega poseka smreke zaradi podlubnikov v Sloveniji v 2023. Verjetnostni model za napoved sanitarnega poseka smreke zaradi podlubnikov je potrdil visoko zanesljivost (AUC modela = 0,89, AUC napovedi = 0,84). Ugotovili smo optimalni prag za verjetnost sanitarnega poseka, ki ga bomo lahko uporabili pri naslednjih napovedih za bolj jasno določitev območij, kjer se bodo potencialno pojavila žarišča smrekovih podlubnikov. Napoved za leto 2023 smo naredili s pragom 0,30, ki pa se je izkazal za prenizkega, saj je bila kar tretjina modelskih celic lažno pozitivnih. Optimalen prag za verjetnostni model v letu 2023 je bil 0,40. Povprečen optimalen prag v obdobju 2020–2023 je bil 0,45, ki ga predlagamo za izdelavo verjetnostne napovedi v naslednjem letu.
Keywords: gozdovi, varstvo gozdov, navadna smreka, Picea abies, sanitarni posek, napoved, ogroženost, model, validacija, zmogljivost, zanesljivost, točnost, natančnost, AUC, občutljivost, specifičnost
Published in DiRROS: 11.12.2023; Views: 407; Downloads: 146
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1610. Usposabljanje BTSF: Izbruhi škodljivih organizmov – načrti izrednih ukrepov za prednostne škodljive organizme, Bratislava, oktober 2023Simon Zidar, Eva Groznik, 2023, popular article Keywords: gozdovi, Varstvo gozdov, zdravje rastlin, načrt izrednih ukrepov, simulacijska vaja, prednostni škodljiv organizem, BTSF
Published in DiRROS: 11.12.2023; Views: 376; Downloads: 166
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