A new web site dedicated to hypogenic caves of Murcia
The Karstology doctoral study program is a world-wide unique program which provides a comprehensive study of karst science, combining the study of the karst landscape, karst caves, karst hydrogeology, biology and ecology of karst in one course of study.
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Speleological Society of Georgia is created.
Dear colleagues, I would like to inform you that Speleological Society of Georgia was created in the Republic of Georgia By following a link below you can read interesting information about speleology of Georgia https://speleologygeorgiawordpresscom/. ...
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That rising is 1. the resurgence of an underground watercourse, usually at the base margin of the calcareous massif, although in the instance of a blind valley the rising has eroded headwards for some distance. each rising accounts for the collective discharge of several sinks and in this way has a relatively high discharge as the sole drainage outlet for a large area. if the water issues freely, the rising is said to be free-flowing, but if it issues under pressure, the terms artesian, forced, or vauclusian spring are used (after the typeexample of the resurgence of the sorgue river at vaucluse in france) . 2. an issue of water from massive limestone which cannot be classed with certainty as either a resurgence or a spring . synonyms: (french.) emergence; (german.) ausflubtelle, karstquelle; (greek.) kephalari; (italian.) sorgente; (russian.) vyhod karstovyh vod; (spanish.) emergencia; (turkish.) yuzeye yukselis; (yugoslavian.) krsko vrelo, krski izvor, obrh. see also emergence; exsurgence; resurgence.?
Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms
Featured article from geoscience journal
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.