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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 Darcy unit is a practical unit for the measure of intrinsic permeability [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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Featured articles from other Geoscience Journals
Karst environment, Culver D.C.
Mushroom Speleothems: Stromatolites That Formed in the Absence of Phototrophs, Bontognali, Tomaso R.R.; D’Angeli Ilenia M.; Tisato, Nicola; Vasconcelos, Crisogono; Bernasconi, Stefano M.; Gonzales, Esteban R. G.; De Waele, Jo
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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Your search for epiphreatic karst (Keyword) returned 3 results for the whole karstbase:
Quelques mcanismes chimiques du creusement des cavernes (plus _particulirement pour ltude de la zone noye), 1999, Lismonde, Baudouin
The classical influences of physical parameters and mixing corrosion are presented to study the equilibrium of the water-air-limestone chemical system. The frequent observation of cave levels in the mountain karstic systems is often associated with the greater facility of dissolution, near the water table. Some chemical mechanisms are analysed to show the greater karst corrosion on this level. Increased air pressure induces an increase in the saturation pCO2 of the water. Two confinement coefficients are used to analyse the role of a limited quantity of air in contact with water. The first (k) is the water mass/water + air mass ratio, the second (kn) is the mass of CO2 in water/ mass of CO2 in water and air ratio. These two ratios show that the latter coefficient varies with air pressure, but is proportional to the varying pCO2.

Corrosion des coupoles de plafond par les fluctuations de pression de lair emprisonn, 2000, Lismonde, Baudouin
CORROSION OF CEILING POCKETS ASSOCIATED WITH PRESSURE OF CONFINE AIR neighbourhood of the water table is proposed. It is applied to the genesis of ceiling pockets. The rising of water confines the air of ceiling pockets. The CO2 pressure increases. The air compres_sion is almost isothermic and induces a mist. The drops of the mist capture the CO2 by a diffusion process. The mass transfer of CO2 from air to drops, then to water, induces a vigorous corrosion of the limestone. For example, 1 m3 of air (at pCO2 = 3.10-3) with a compression of 1 bar (10 m) produces a maximum calcite dissolution of 1 g. A rough computing model for the ceiling pockets' growth is presented also.

Modeling flow in phreatic and epiphreatic karst conduits in the Holloch cave (Muotatal, Switzerland), 2001, Jeannin P. Y. ,
The Holloch cave is a site where the hydrodynamic behavior of a karst conduit network can be observed with a high degree of precision. Observed heads. discharge rates, conduit sizes, and conduit lengths have been compiled into a simple hydrodynamic model in order to check their consistency. It was possible to calibrate and satisfactorily fit the observed data. Model results show the following: (1) Flow models which are able to simulate turbulent flow in variably saturated conduit networks can adequately model conduit flow-dominated karst systems. (2) Karst systems may be strongly nonlinear, especially because of the presence of epiphreatic conduits. (3) Under certain circumstances, storage in the epiphreatic conduits and in the fissured limestone matrix can be neglected. (4) The typical effective hydraulic conductivity of karst conduits ranges between 1 and 10 m s(-1), and the Louis Formula is adequate to calculate head losses in those conduits. (5) Indirect measurements of flow velocity using scallop size indicate values of similar to 30-40% of the maximal annual discharge, and velocity derived from pebble size indicates values of similar to 150% of the maximal annual discharge

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