Hidrogeokemična in izotopska karakterizacija ter ocena hidravličnega delovanja kompleksnega kraškega območja Izeh, provinca Khuzestan, jugozahodni Iran
DOI:
https://doi.org/10.3986/ac.v52i1.10687Ključne besede:
Izeh, kemijski izotopi, kras, hidravlična povezanostPovzetek
Ustrezno gospodarjenje z vodnimi viri temelji na prepoznavanju in vrednotenju dejavnikov, ki vplivajo na količino in kakovost vodnih virov. Apnenčasto-dolomitni formaciji Ilam-Sarvak (zgornja kreda) in Asmari (oligocen do miocen) v strukturnem pasu Zagros sta oblikovali obetaven kraški vodonosnik. V tej študiji je bil hidravlični odnos med kraškimi strukturami ozemlja Izeh, ki je na severovzhodu province Khuzestan, ocenjen z uporabo hidrogeokemičnih in izotopskih analiz vode v izvirih in vodnjakih. Rezultati so omogočili razumevanje komponent, ki vplivajo na napajanje vodnih virov. Zbrani so bili vzorci iz kraških izvirov in vodnjakov antiklinal Mongašt, Šaviš-Tanoš, Kamarderaz, sinklinale Naal-e-Asbi (podkev) in meteorne vode, da bi razumeli hidrokemično in izotopsko karakterizacijo ter hidrogeološko in hidravlično delovanje kraškega sistema Izeh. Za določitev koncentracij glavnih in drugotnih ionov ter razmerja izotopov δ18O in δ2H so bili analizirani vzorci meteorne in podzemne vode. Vsebnosti izotopov so bile v razponu od ‒31,6 do ‒2,9 ‰ za δ2H in od ‒6,32 do ‒1,87 ‰ za δ18O, vrednosti devterijevega presežka pa so bile visoke in pozitivne. Analize vsebnosti izotopov v vzorcih vode iz izvirov in vodnjakov v regiji kažejo na tri skupine vodnih virov. Prva skupina, ki je povezana z izviri antiklinale Mongašt, ima nižje izotopske vrednosti, kar kaže, da se napaja s padavinami na višjih nadmorskih višinah in s taljenjem snega. Izotopska vrednost druge skupine je bogatejša od prve skupine, kar kaže na napajanje s padavinami in na mešanje podzemnih vod (primera sinklinale Naal-e-Asbi in antiklinale Šaviš-Tanoš). Najvišja vrednost v tretji skupini (vzorci antiklinale Kamarderaz) je posledica delno izhlapevanja in daljše razdalje med mestoma napajanja in iztekanja ter delno difuzijskega sistema. Trend padanja Sr2+ in naraščanja Ba2+ v vzorcih v formacijah dolomitnih apnencev (antiklinali Šaviš-Tanoš in Mongašt) v primerjavi z vzorci vode antiklinale Kamarderaz in sinklinale Naal-e-Asbi kaže na možnost, da se kraški vodonosniki napajajo iz območja antiklinale Mongašt, in na hidravlični odnos med temi strukturami. Devterijev presežek in δ18O kažeta linearni trend, ki ponazarja učinek višinske razlike na vsebnost izotopov in vire napajanja. Večje in manjše spremembe v koncentraciji ionov, vsebnosti izotopov v podzemni vodi in razmerju med TDS in δ18O ter devterijevim presežkom in δ18O kažejo na mešanje in napajanje kraških vodonosnikov (vodonosniki Šaviš-Tanoš, Kamarderaz in Naal-e-Asbi) s kraškega vodonosnika Mongašt in na njihovo hidravlično povezanost.
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To delo je licencirano pod Creative Commons Priznanje avtorstva 4.0 mednarodno licenco.
Avtorji jamčijo, da je delo njihova avtorska stvaritev, da v njem niso kršene avtorske pravice tretjih oseb ali kake druge pravice. V primeru zahtevkov tretjih oseb se avtorji zavezujejo, da bodo varovali interese založnika ter da bodo povrnili morebitno škodo.
Podrobneje v rubriki: Prispevki