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Speleology in Kazakhstan

Shakalov on 11 Jul, 2012
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 Also we have forum there. ...

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 aven is 1. a hole in the roof of a cave passage that may be either a rather large blind roof pocket or a tributary inlet shaft into the cave system. a feature described as an aven when seen from below may equally be described as shaft when seen from above, and the naming of such a feature commonly depends purely upon the direction of exploration. many avens close upwards to impenetrable fissures but may still be important hydrological routes; few caves are without them. in parts of france, aven is equivalent to the british term, pothole [9]. 2. (french.) a vertical or highly inclined shaft in limestone, extending upward from a cave passage, generally to the surface; smaller than an abime. commonly related to enlarged vertical joints. compare cenote; natural well; pothole. 3. (british.) a vertical extension from a shaft in a passage or chamber roof that tapers upward rather like a very elongate cone [10]. compare dome pit.?

Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms

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Latest news:

Karst Division is created in the GSA
The Geological Society of America Council has approved the creation of the Karst Division at its annual meeting on Wednesday, October 22.
Speleogenesis membership has passed over 1000 !
On Thursday October 2, 2014 the membership in the Speleogenesis Network has reached 1000 ! The lucky registration was by Jim Goodbar of US, - welcome, and congratulations!
Spanish caver injured in a deep cave in Peru.
Cecilio López-Tercero, profesional speleologist was injured during the exploration of the karst system in Leymebamba, Amazonas, located in the Andean Cordillera.
Evaporite Karst in the Greater Permian Basin
The session on evaporite karst will be held at the South-Central Section, Geological Society of America (GSA) meeting in Stillwater, OK, on March 19-20, 2015.
State of Minnesota, U.S.A. employment (hydrology-hydrogeology)
The State of Minnesota has positions open for hydrologists. These positions include some for hydrogeologists.

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Did you know?

That bedding grike is term used to describe the occurrence of the dissolution and widening (similar to that which occurs in joints) of nearly vertical bedding in karst terranes [8]. synonym: (german.) schichtfugenkarren.?

Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms

Featured articles from Cave & Karst Science Journals
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Featured articles from other Geoscience Journals
A review on natural and human-induced hazards and impacts in karst, Gutiérrez Francisco, Parise Mario, De Waele Jo, Jourde Hervé
Nonlinear Flow in Karst Formations, Chin, D.A.; Price, R.M.; DiFrenna, V.J.
Characterisation and modelling of conduit restricted karst aquifers – Example of the Auja spring, Jordan Valley, Schmidta, Sebastian; Geyera, Tobias; Guttmanb, Joseph; Mareic, Amer; Riesd, Fabian; Sauter, Martin
See all featured articles from other geoscience journals

Featured article from geoscience journal

Elsevier
Journal of Hydrology, 2010, Vol 389, Issue 3, p. 260-275
Effects of Karst and geological structure on groundwater flow: The case of Yarqon-Taninim Aquifer, Israel
Abstract:

This study demonstrates the significant influences of the geological structure (especially folding and lithology) and the karst system on groundwater flow regime. Folds divert groundwater flow from the general hydraulic gradient; marly layers sustain several perched sub-aquifers above the regional aquifer; and karstification increases the hydraulic conductivity by several orders of magnitude. These phenomena are quantitatively demonstrated within the Yarqon-Taninim (YT) basin, Israel, which is a complex groundwater system, combining several (extremely) opposite characteristics: humid and arid recharge zones, phreatic and confined parts, shallow and deep sub-aquifers, stratified and relatively-homogeneous sub-basins, saline and fresh water bodies, as well as stagnant and fast-flowing groundwater regions.

We have introduced a 3D geological-based grid for the basin (for the first time). It was implemented into a numerical code (FEFLOW), which was used thereafter to analyze quantitatively the flow regime, the groundwater mass balance, and the aquifer hydraulic properties. We present up to date conceptual understanding and numerical modeling of the YT flow field, especially at its mountainous parts.

Based on the calibration procedure and the sensitivity analyses, we obtained the best-fitted hydraulic conductivity values for the aquifer mesh. The general phenomenon observed is that as groundwater flow quantity increases, the hydraulic conductivity also increases. We interpret this result by the karstification mechanism (including paleo-karst). Thus, where groundwater flow-lines converge and where groundwater discharge amount increases, the karstification process intensifies and permeability increases. Consequently, at the mountainous region, along the syncline axes, where groundwater flow-lines converge, higher conductivities are found.

Modeling results also exhibit that at the lowland confined area, the geological structure does not play a major role in directing groundwater flow. Rather, the flow field is controlled by the well-developed karst system and the relatively homogenous carbonate section. It is hypothesizes that the extensive karstification took place at the Messinian Salinity Crises, 5.5 Ma, during which groundwater heads as well as sea level were lowered by several 100 m.