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  • The surface above Postojnska jama and its relation with the cave : the case of Kristalni rov
    Kogovšek, Janja, krasoslovka
    The results of water tracing test realized to get the relation between the surface above Postojnska jama and the cave are given. The injected Uranin was washed by 6 m3 of water and we measured the ... discharge of the trickles and drops and sampled them on a wider area. At infiltration through 100 m thick limestone relatively narrow water dispersion occured having its center in the trickle which discharge reacted the most and contained at the same time the highest Uranin concentration. On other points where Uranin presence was equally detected it appeared only after the rain which pressed the dye through obviously badly pervious conduits with big resistance and slow water exchange. The complexity of the runoff through well permeable conduits where the watered drain achieve the velocity of 2,2 cm/s-1 (throught 100 m thick limestones the water drained in 75 minutes) and badly permeable conduits where the tracer was detected 3 month later giving the apparent velocity of 0,0015 cm/s-1 was shown. It was also evidenced that the substances accumulate for longer time in less permeable backgrounds of the trickles and this is why they are outwashed for long time. It partly explains why at bigger spills on our roads the immediate "catastophical" consequences do not appear. We must aware of the accumulation possibility and slow washing and cleaning of the karst background
    Vir: Bossea MCMXCV : atti del simposio internazionale Grotte Turistiche e Monitoraggio Ambientale : Frabosa Soprana (Cuneo, Italia) 24-26/III/1995 = proceedings of the international symposium Show Caves and Environmental Monitoring = actes du symposium international Grottes Amenagées et Contrôle de l'Environnement Souterrain (str. 31-39)
    Vrsta gradiva - prispevek na konferenci
    Leto - 1996
    Jezik - angleški
    COBISS.SI-ID - 4660525

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