Določitev smeri in značilnosti toka podzemne vode v krasu za namen izgradnje prometnih poti: primer nove železniške proge Divača‒Koper (JZ Slovenija)

Avtorji

  • Metka Petrič Karst Research Institute at ZRC SAZU and UNESCO Chair on Karst Education, University of Nova Gorica
  • Nataša Ravbar Karst Research Institute at ZRC SAZU and UNESCO Chair on Karst Education, University of Nova Gorica
  • Luca Zini Department of Mathematics and Earth Sciences, University of Trieste
  • Chiara Calligaris Department of Mathematics and Earth Sciences, University of Trieste
  • Riccardo Corazzi Caving club Commissione Grotte "E.Boegan" - Società Alpina delle Giulie CAI Trieste
  • Zdenka Žitko Speleological Association of Slovenia
  • Marco Restaino Caving club Società Adriatica di Speleologia
  • Martin Knez Karst Research Institute at ZRC SAZU and UNESCO Chair on Karst Education, University of Nova Gorica

DOI:

https://doi.org/10.3986/ac.v49i1.8582

Ključne besede:

kraška voda, železniška proga, sledilni poskus, zasičena cona, aktivni vodni tokovi, matični kras

Povzetek

Med Divačo in Koprom v jugozahodni Sloveniji je v izgradnji nova železniška proga, ki deloma seka južno obrobje planote matičnega krasa. Proga ima dva predora, severni T1 (dolg 6,7 km) in južni T2 (dolg 6 km), ki potekata skozi kraški vodonosnik. Za določitev smeri in dinamike toka podzemne vode je bil izveden kombinirani sledilni poskus z injiciranjem fluorescenčnih sledil uranina in naftionata neposredno v zasičeno cono. Glavna cilja sta bila boljše razumevanje zapletenih hidrogeoloških razmer na tem območju in ocena možnih okoljskih vplivov na bližnje vodne vire. Z injiciranjem uranina v vodni tok v bližnji kraški jami je bila dokazana smer toka podzemne vode z območja severnega predora T1 predvsem proti vodonosnemu sistemu Reka-Timava in naprej proti izvirom Timave. Glede na pojav vrha krivulje iztekanja sledila so bile določene navidezne dominantne hitrosti med 29 m/h in 36 m/h. V večjih in dobro povezanih kraških kanalih sistema Reka-Timava lahko te hitrosti dosežejo 88 m/h. V Jami 1 v Kanjaducah, ki je del sistema, je bilo zaznanih približno 74 % injiciranega sledila. Severni del južnega predora T2 je del širšega bifurkacijskega območja med Osapsko reko in izviri v Boljuncu. V njem so bile z injiciranjem naftionata v eno izmed vrtin v trasi načrtovane železniške proge ugotovljene dominantne hitrosti toka med 10 in 13 m/h. Ocenjeno je bilo, da je približno 25 % injiciranega naftionata izteklo skozi izvir Osapske reke in približno 5 % skozi izvire v Boljuncu. Z upoštevanjem rezultatov raziskave bo mogoč ustrezen monitoring morebitnih negativnih vplivov nove železniške proge na podzemne vode. Študija prinaša izboljšan pristop k načrtovanju nadzora nad nevarnostmi prometnih poti na območjih zelo zakraselih kamnin s prepletanjem podzemnih vodnih tokov.

Prenosi

Podatki o prenosih še niso na voljo.

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Objavljeno

2020-10-06

Kako citirati

Petrič, M., Ravbar, N., Zini, L., Calligaris, C., Corazzi, R., Žitko, Z., Restaino, M., & Knez, M. (2020). Določitev smeri in značilnosti toka podzemne vode v krasu za namen izgradnje prometnih poti: primer nove železniške proge Divača‒Koper (JZ Slovenija). Acta Carsologica, 49(1). https://doi.org/10.3986/ac.v49i1.8582

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