Podrobnosti záznamu

Název
    Ground-Water Residence Time in Crystalline Rocks
Údaj o odpovědnosti
    Jan Šilar
Další názvy
    First Workshop on Hardrock Hydrogeology of the Bohemian Massif, October 3-5, 1994 Rohanov, Czech Republic (Variant.)
Autor
    Šilar, Jan
Jazyk
    anglicky
Zdrojový dokument - seriál
    Acta Universitatis Carolinae, Geologica
Svazek/č.
    Vol. 40, no. 2
Strany
    p. 279-288
Rok
    1996
Poznámky
    1 obr., 1 diagr., 2 s.bibl.
    Zkr. název ser.: Acta Univ. Carol., Geol.
Předmětová skupina
    Český masiv
    datování absolutní
    hydrodynamika
    hydrogeologická struktura
    izotopy radioaktivní
    konference
    krystalinikum
    piezometrie
    voda podzemní
    Západní Karpaty
Geografické jméno
    Česká republika
    Slovensko
Klíčové slovo
    Crystalline
    Ground-Water
    Residence
    Rocks
    Time
Abstrakt (anglicky)
   Isotope dating of ground water was used to clarify the ground-water residence time. Its values up to several thousand years established along deep reaching structures of thermal springs have not been a surprise when compared with the residence times in deep basinal structures in sedimentary formations. They have shown, however, that, apart of modern ground water in the shallowest weathered zone, even the ground-water residence time beyond the deep reaching tectonic zones is often high. Values in the range of thousands of years have been established in relatively shallow boreholes as much as 100 m deep in fissured metamorphic rocks covered with less permeable eluvia. The phenomenon indicates that slower and deeper ground-water circulation exists in the fissured zone below a shallower zone of less permeable weathered rocks.
   The fissures of the weathered zone at its bottom seem to be clogged with the clayey weathering products which separate the upper aquifer in eluvia from the fissured zone below. The water in the fissured rocks is sometimes confined, the upper aquifer in the weathered rock is sometimes perched, depending on the local morphology and piezometric conditions
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    25. 3. 2008
Datum importu
    8. 8. 2012