Karst spring

Source: Wikipedia, the free encyclopedia.
A 130-metre (430 ft) deep karst spring of the Cetina River in Croatia[1]
Blagaj Tekke under a limestone cliff in Bosnia
Blautopf (Blue Pot), karst spring of the River Blau (River Blue) in Blaubeuren, Swabian Jura

A karst spring or karstic spring is a spring (exsurgence, outflow of groundwater) that is part of a karst hydrological system.[2]

Description

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

Blau river in Blaubeuren
).

Karst springs often have a very high

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

Mediterranean countries such as Bosnia and Herzegovina, Croatia, Turkey, Slovenia, and Italy.[3]

Types

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.[4]

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.[4]

Submarine karst springs, also known as vruljas, occur worldwide, and are most numerous in shallow waters of the Mediterranean Sea.[4] 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.[clarification needed]

Hydrological features

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.[5]

Many karst springs dry up during the driest part of the year, and are thus known as

intermittent springs.[dubious – discuss] 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.[6]

The properties of karst springs make them unsuitable for the supply of

hardness mean that the water quality is poor.[7]

Cultural references

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.[8]

Gallery

See also

References

  1. ^ Rogulj, Daniela (2016-10-04). "Drone footage of the Cetina like you have never seen before". Total Croatia News. Archived from the original on 2016-10-08.
  2. ISBN 0-14-051094-X
    .
  3. ISBN 9781118684993
    .
  4. ^
    ISBN 978-3-540-61841-6
    .
  5. ^ "Geopark Schwäbische Alb". www.geopark-alb.de.
  6. ^ "Karst Features of Germany: Hungerbrunnen". showcaves.com.
  7. ISBN 978-3540618416
    .
  8. doi:10.3406/karst.2007.2611
    .

External links

Wikimedia Commons has media related to Karst springs.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Karst_spring&oldid=1178875030"