karst spring

Because of their often conical or inverted bowl shape, karst springs are also known in German-speaking lands as a Topf ("pot") which is reflected in names such as Aachtopf (the source of the Radolfzeller Aach) or Blautopf (the source of the Blau river in Blaubeuren).

Karst springs often have a very high yield or discharge rate, because they are often fed by underground drainage from a large catchment basin. Because the springs are usually the terminus of a cave drainage system at the place where a river cave reaches the Earth's surface, it is often possible to enter the caves from karst springs for exploration.

Large karst springs are located in many parts of the world; the largest ones are believed to be in Papua New Guinea, with others located in Mediterranean countries such as Bosnia and Herzegovina, Croatia, Turkey, Slovenia, and Italy.{{cite book |url=https://books.google.com/books?id=whgNDVXFiqYC&q=tobio+spring+new+guinea |title=Karst Hydrogeology and Geomorphology |first1=Derek |last1=Ford |first2=Paul D. |last2=Williams |year=2013 |publisher=John Wiley & Sons|isbn=9781118684993 }}

An estavelle or inversac is a ground orifice which, depending on weather conditions and season, can serve either as a sink or as a source of fresh water. It is a type of sinkhole.{{cite book |chapter-url=https://books.google.com/books?id=sjEoBmfUka0C&pg=PA57 |chapter=Geologic/Hydrogeologic Setting and Classification of Springs |page=57 |title=Springs and Bottled Waters of the World: Ancient History, Source, Occurrence, Quality and Use |first=Philip |last=Elmer LaMoreaux |year=2001 |publisher=Springer |isbn=978-3-540-61841-6}}

A Vauclusian spring is a spring that originates from a shaft or a cave system, with the water surging upwards under relatively high pressure. It is named after the Fontaine de Vaucluse in southern France.

Submarine karst springs, also known as {{lang|hr|vruljas}}, occur worldwide, and are most numerous in shallow waters of the Mediterranean Sea. They can be considered to be karst springs which have become submerged by rising sea levels.

For intermittent or rhythmic springs see below. They are part of another type of classification, which differentiates between perennial (with continuous flow), rhythmic, and temporary springs.{{clarify|reason=See talk-page.|date=June 2022}}

A main feature of karst springs is that water is rapidly transported by caverns, so that there is minimal filtering of the water and little separation of different sediments. Groundwater emerges at the spring within a few days from precipitation. Storms, snowmelt, and general seasonal changes in rainfall have a very noticeable and rapid effect on karst springs.{{Cite web|url=https://www.geopark-alb.de/en/geopark-erleben/gelogische-highlights.php?we_objectID=1900|title=Geopark Schwäbische Alb|website=www.geopark-alb.de}}

Many karst springs dry up during the driest part of the year, and are thus known as intermittent springs.{{dubious|Wrong, those are "temporary". "Intermittent" or "rhythmic" springs have relatively regular bursts. Different category.|date=June 2022}} Still others are dry most of the year round and only flow after heavy rain. Sources that only flow during wet years are often known in German as Hungerbrunnen ("hunger springs"), since folklore claimed a connection between the flow rate of a spring and poor crop yield in a wet year. This appears to be more of a culturally-related superstition, as scientific studies on various Hungerbrunnen have not confirmed such a relationship. An example is the Hungerbrunnen in the parish of Heuchlingen near Gerstetten.{{Cite web|url=https://showcaves.com/english/de/karst/Hungerbrunnen.html|title=Karst Features of Germany: Hungerbrunnen|website=showcaves.com}}

The properties of karst springs make them unsuitable for the supply of drinking water. Their uneven flow rate does not support a steady rate of consumption, especially in summer when there is lower discharge but higher demand. In addition, poor filtering and high hardness mean that the water quality is poor.{{Cite book|title=Springs and Bottled Waters of the World|last=LaMoreaux|first=Phillip|publisher=Springer|year=2012|isbn=978-3540618416|location=US|pages=56, 57, 58}}

The French Realist painter Gustave Courbet (1819–1877) painted a number of karst springs among many landscapes he depicted in the Jura region of eastern France.{{cite journal |last1=Fumey |first1=Gilles |title=Courbet, peintre du calcaire |journal=Karstologia: Revue de Karstologie et de Spéléologie Physique |language=fr |volume=50 |pages=49–51 |doi=10.3406/karst.2007.2611 |date=2007}}

{{gallery|mode=packed

|File:Fontaine de Vaucluse en crue.jpg|Fontaine-de-Vaucluse, karst spring of the Sorgue, characterised by an upward movement of water from the depth of over {{convert|315|m}}

|File:Vrulja kod Omiša.jpg|A submarine karst spring (vrulja), observed through sea surface rippling near Omiš

|File:Rhumequelle - panoramio.jpg|Rhumequelle (Rhume Spring), source of the Rhume, in Herzberg am Harz-Rhumasprung (de) right next to Rhumspringe

|File:Մարամեք աղբիւր.JPG|Maramec Spring in the Ozarks, Missouri

|File:Tuhala Witches Well1-21-03-2013.jpg|"Witch's Well" karst spring in Tuhala, Estonia

|File:Quiet pool.jpg|The Mshentsy spring, Bologovsky district, Tver region, Russia

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• List of karst springs
• Ponor
• Cenote
• Thermokarst

{{Reflist}}

{{Commons category|Karst springs}}

• [http://www.karstquellen.de Karst springs in Germany] {{in lang|de}}
• [http://www.fhkf.de/hungerbrunnen-im-leinleitertal-aktiv/ The Hungerbrunnen in the Leinleiter valley] {{in lang|de}}

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{{rivers, streams and springs}}

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Category:Springs (hydrology)

Category:Hydrogeology