Brennsee

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Brennsee
Brennsee.jpg
View of the Brennsee from the southeast
Geographical location Carinthia , Austria
Tributaries Gruberbach, Erlachbach, Lammerggerbach
Drain Over the Feldbach and the Kleinkirchheimer Bach into the Millstätter See
Places on the shore Field by the lake
Data
Coordinates 46 ° 46 '8 "  N , 13 ° 45' 5"  E Coordinates: 46 ° 46 '8 "  N , 13 ° 45' 5"  E
Brennsee (Carinthia)
Brennsee
Altitude above sea level 739  m above sea level A.
surface 41,193 ha
length 1.3 km
width 500 m
volume 6,274,453 m³
Maximum depth 26.3 m
Middle deep 15.4 m
Catchment area 8.3 km²
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The Brennsee or Feldsee is a lake in the Umgebung Valley in Carinthia . It is located in the municipality of Feld am See . The lake is used as a bathing lake.

geography

The Feldsee lies between the slopes of the Mirnock and Wöllaner Nock , which slope steeply towards the lake, in the furrow of the valley. The slopes of the Mirnock are covered with forest, the sun-exposed slopes in the north of the lake mainly have pastures and some large farms.

Hydrology and ecology

The inflow of the lake takes place on the one hand via the groundwater flow, on the other hand from the north via some small tributaries. The lake runoff flows into the Kleinkirchheimer Bach, which then flows into the Millstätter See as the Riegerbach . The mean discharge is 80 l / s. The lake has a water renewal time of around 2.5 years.

The lake is holomictic and is clearly stratified in summer. The surface temperature in summer rises to 23 ° C.

The lake water has a very low lime content, the lake is one of the lime-poorest valley lakes in Carinthia.

The lake has a catchment area of ​​8.3 km².

The settlements in the catchment area were connected to the sewer system from 1976 to 1981, and the wastewater has since been treated in the sewage treatment plant of the Millstätter See wastewater association in Spittal an der Drau . However, from around 1975 onwards, the wastewater and liquid manure spreading from the farms led to severe eutrophication of the lake. From 1985 a strong weed growth in the bank area with Elodea canadensis , Myriophyllum spicatum and several species of the genus Potamogeton was observed. In addition, there was a strong increase in the number of floating algae and regular blue-algae blooms. The water was very cloudy, there was also foam development on the surface. Mechanical weeding was ineffective. In 1991 a redevelopment concept was drawn up. In 1992 deep water aeration was installed.

After the renovation measures, the lake was rated as very good from a hygienic point of view in 2009, the trophy was classified as weakly mesotrophic .

Animals in the Brennsee

The following 16 fish species can be found in the Brennsee:

The annual yield is 30 to 40 kg / ha. This very high value is achieved due to the large number of fish and the abundance of underwater plants . The majority of the yield is based on the stocking fish pike and carp. Catfish and perch also have good populations. Roach, rudd and arbor dominate the non-predatory fish.

The noble crayfish ( Astacus astacus ) became extinct in the lake in the 1970s. Around 1000 specimens have been used annually since 1992 with the aim of re-establishing a population in the lake.

See also

supporting documents

  1. ↑ a b c d e Carinthian Institute for Lake Research: Carinthian Lake Report 1992. 60 years of lake research, 30 years of lake restoration . (= Publications by the Carinthian Institute for Lake Research 7) Klagenfurt 1992, pp. 399–415.
  2. ↑ a b c d Feldsee on the website of the Carinthian Institute for Lake Research , accessed November 10, 2016.
  3. ↑ Feldsee in the Carinthian Lake Report 2010 , accessed November 10, 2016.

Web links

Commons : Brennsee  - collection of images, videos and audio files