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predavanje
31. maja 2005 ob 19:00,
Mala dvorana ZRC SAZU, Novi trg 4, II. nadstropje
Wolfgang
Dreybrodt
Karst
Processes Research Group, University of Bremen, Nemčija
Island
karst: evolution of porosity in young, porous limestone by mixing
corrosion in freshwater- saltwater mixtures
Mixing of
seawater and freshwater, both saturated with respect to calcite,
renews undersaturation. This causes dissolution of limestone in the mixing
zone of freshwater lenses below carbonate islands, e.g. Bahamas, or
coastal aquifers. Flank-margin caves are characteristic karst features. In
contrast to classical karst in diagenetically
mature rock where water
flows through primary fractures, the hydrological properties of aquifers
in porous rock are governed by Darcy flow. This causes other pathways to
karstification. A model of these is presented.
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