Pesenbach (Danube)

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Pesenbach
The Pesenbach in the Pesenbachtal

The Pesenbach in the Pesenbachtal

Data
location Mühlviertel , Upper Austria
River system Danube
Drain over Danube  → Black Sea
origin near Pesenbach (municipality of St. Johann am Wimberg )
48 ° 29 ′ 7 ″  N , 14 ° 6 ′ 55 ″  E
Source height approx.  630  m above sea level A.
muzzle near Ottensheim in the Danube Coordinates: 48 ° 19 '35 "  N , 14 ° 9' 57"  E 48 ° 19 '35 "  N , 14 ° 9' 57"  E
Mouth height approx.  255  m above sea level A.
Height difference approx. 375 m
Bottom slope approx. 11 ‰
length approx. 34.5 km
Catchment area 103.6 km²
Discharge at the gauge Pesenbach
A Eo : 69 km²
Location: 8.84 km above the mouth 		NNQ (06/05/2003)
MNQ 1971–2005
MQ 1971–2005
Mq 1971–2005
 MHQ 1971–2005
HHQ (08/12/2002) 		0 l / s
70 l / s
720 l / s
10.4 l / (s km²)
 15.8 m³ / s
128 m³ / s
Left tributaries Steinbachl, Hametnerbach, Tiefenbach, Freudensteiner Bach

The Pesenbach is a 35 km long left tributary of the Danube in the Mühlviertel in Upper Austria .

Run and landscape

The Pesenbach arises from the confluence of two source streams, the Edelbach and the Loizenbach, near Pesenbach in the municipality of St. Johann am Wimberg . It flows first in a south-westerly, then mainly in a southerly direction and flows through Niederwaldkirchen as the only larger town . South of St. Martin in the Mühlkreis he formed the Pesenbachtal , a breakthrough through the hard rock ( Weinsberg granite and coarse-grain gneiss) on the southern edge of the Bohemian Massif . At Bad Mühllacken it reaches the Eferdinger Basin and flows roughly parallel to the Danube towards the east. The area of ​​the mouth was changed significantly during the construction of the Ottensheim-Wilhering power plant , the Pesenbach now flows around 3 km above the original mouth into a wide, regulated channel that was created from an old Danube arm and merges with the Danube below the power plant.

The Pesenbach has four quite different descents. The approximately 6 km long upper course with an average gradient of 2.9% is followed by a 14 km long section with a gradient of only 8.5 ‰. This is followed by the roughly 2.5 km long, steep breakthrough section with a 5.0% gradient. The lower course in the Eferdinger Basin is again very flat with a gradient of around 2 ‰.

Catchment area and water supply

The Pesenbach drains a catchment area of 103.6 km². 33% of this is arable land, 34% grassland and 24% forest.

The mean discharge at the Pesenbach gauge, 8.8 km above the mouth, is 0.72 m³ / s. The discharge of 10.4 l / s · km² is significantly lower than that of neighboring rivers such as the Große Mühl (19.0 l / s · km²) or the Große Rodl (14.6 l / s · km²). The Pesenbach has a pronounced winter pluvial runoff regime . The maximum discharge is during the winter months, the month with the highest discharge is March with 1.45 m³ / s. The discharge minima are measured in September (0.32 m³ / s) and October (0.36 m³ / s), a secondary minimum occurs in June (0.43 m³ / s). The runoff regime is not primarily influenced by precipitation, but by evaporation, which is why runoffs are highest in winter.

ecology

The Pesenbach is classified as near-natural, it is partly meandering and often has a wide wood along the banks, which is mainly formed from willow , alder , ash and poplar. The Pesenbachtal with its natural stream is designated as a nature reserve. In addition to extensive spruce forests , it has near-natural oak-hornbeam forests and beech forests .

In the 1990s the Pesenbach had water quality class II-III, today it is classified in class I-II in the upper reaches, and in class II from Niederwaldkirchen. The stream is interrupted by several hydropower plants.

The upper course belongs to the trout region with the brown trout as a typical fish. In the lower reaches of the Pesenbach merges into the barbel region, here you can find barbel and nose .

Individual evidence

  1. ↑ a b c d Digital Upper Austrian Room Information System (DORIS)
  2. ↑ a b c d e Office of the Upper Austrian Provincial Government (ed.): Ranna-Osterbach, Pesenbach and Große Rodl: Investigations on water quality, status 1993-1996. Water protection report 17/1997, Linz 1997 ( PDF; 153 MB )
  3. ↑ a b Federal Ministry for Agriculture, Forestry, Environment and Water Management (ed.): Hydrographisches Jahrbuch von Österreich 2005. 113th volume. Vienna 2008, p. OG 162, PDF (9.6 MB) on bmlrt.gv.at (yearbook 2005)
  4. ↑ Helmut Mader, Theo Steidl, Reinhard Wimmer: Discharge regime of Austrian rivers. Contributions to a nationwide river typology. Federal Environment Agency, monographs Volume 82, Vienna 1996, p. 100 ( PDF; 14.7 MB )
  5. ↑ a b Office of Upper Austria. Provincial government, nature conservation department (ed.): Nature and landscape - models for Upper Austria. Volume 8: Room unit Eferdinger basin. Revised Version, Linz 2007 (PDF; 6.5 MB)
  6. ^ Office of Upper Austria. Provincial government (Hrsg.): Natural area mapping Upper Austria - landscape survey Herzogsdorf. Final report, Kirchdorf an der Krems 2005 ( PDF; 5 MB )
  7. ^ Province of Upper Austria - nature conservation database
  8. ^ Office of Upper Austria. Provincial government (ed.): Natural area mapping Upper Austria - landscape survey of the municipality of St. Martin in the Mühlkreis. Final report, Roitham 2005 ( PDF; 2.1 MB )
  9. ^ Office of Upper Austria. State government: water quality maps
  10. ^ Upper Austrian State Fisheries Association: Pesenbach-Gusen