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Speleology in Kazakhstan

Shakalov on 04 Jul, 2018
Hello everyone!   I pleased to invite you to the official site of Central Asian Karstic-Speleological commission ("Kaspeko")   There, we regularly publish reports about our expeditions, articles and reports on speleotopics, lecture course for instructors, photos etc. ...

New publications on hypogene speleogenesis

Klimchouk on 26 Mar, 2012
Dear Colleagues, This is to draw your attention to several recent publications added to KarstBase, relevant to hypogenic karst/speleogenesis: Corrosion of limestone tablets in sulfidic ground-water: measurements and speleogenetic implications Galdenzi,

The deepest terrestrial animal

Klimchouk on 23 Feb, 2012
A recent publication of Spanish researchers describes the biology of Krubera Cave, including the deepest terrestrial animal ever found: Jordana, Rafael; Baquero, Enrique; Reboleira, Sofía and Sendra, Alberto. ...

Caves - landscapes without light

akop on 05 Feb, 2012
Exhibition dedicated to caves is taking place in the Vienna Natural History Museum   The exhibition at the Natural History Museum presents the surprising variety of caves and cave formations such as stalactites and various crystals. ...

Did you know?

That soil profile is a vertical section of the soil mantle usually with distinguishable soil horizons [16].?

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KarstBase a bibliography database in karst and cave science.

Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
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Calculating flux to predict future cave radon concentrations, Rowberry, Matt; Marti, Xavi; Frontera, Carlos; Van De Wiel, Marco; Briestensky, Milos
Microbial mediation of complex subterranean mineral structures, Tirato, Nicola; Torriano, Stefano F.F;, Monteux, Sylvain; Sauro, Francesco; De Waele, Jo; Lavagna, Maria Luisa; D’Angeli, Ilenia Maria; Chailloux, Daniel; Renda, Michel; Eglinton, Timothy I.; Bontognali, Tomaso Renzo Rezio
Evidence of a plate-wide tectonic pressure pulse provided by extensometric monitoring in the Balkan Mountains (Bulgaria), Briestensky, Milos; Rowberry, Matt; Stemberk, Josef; Stefanov, Petar; Vozar, Jozef; Sebela, Stanka; Petro, Lubomir; Bella, Pavel; Gaal, Ludovit; Ormukov, Cholponbek;
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Czech Speleological Society, Praha
Proceedings of the 16th International Congress of Speleology, July 2128, Brno, 2013, Vol 3, p. 349-355
HOW DO APERTURE SIZES IN LIMESTONE VARY FOR THE ONSETS OF TURBULENT FLOW AND FIRST-ORDER DISSOLUTION KINETICS?
Abstract:

 

It is commonly stated in the literature that the “breakthrough” point at the transition from slow high-order to fast firstorder dissolution kinetics in limestone occurs at an exit aperture of about one centimetre, and that this coincides with the transition from a wholly laminar flow to a turbulent flow. These relationships are approximately true for a range of conduit geometries in sub-horizontally bedded strata. However, the exit aperture for the onset of turbulence varies with the hydraulic gradient whereas the exit aperture for the onset of first-order kinetics varies with the hydraulic ratio, which is the hydraulic gradient divided by the path length. These transitions only occur at the same exit aperture for planar fissures and cylindrical tubes of lengths 290 m and 452 m. Breakthrough can occur before or after the onset of turbulence. Aperture sizes for breakthrough and turbulence can be over a metre for long and shallow conduits but sub millimetre for short and steep conduits. This paper analyses these relationships for many conduits in natural and artificial conditions and discusses their relevance to the multitude of possible karst situations, where hydraulic ratios can be considered over 17 orders of magnitude.