Aar (Lahn)

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Aar
Course of the Aar (interactive map)

Course of the Aar ( interactive map )

Data
Water code EN : 2588
location Taunus

Germany

River system Rhine
Drain over Lahn  → Rhine  → North Sea
source near Fort Zugmantel near Orlen
50 ° 11 ′ 17 ″  N , 8 ° 12 ′ 33 ″  E
Source height 429  m above sea level NHN
muzzle in Diez in the Lahn coordinates: 50 ° 22 ′ 8 ″  N , 8 ° 0 ′ 20 ″  E 50 ° 22 ′ 8 ″  N , 8 ° 0 ′ 20 ″  E
Mouth height approx.  103  m above sea level NHN
Height difference approx. 326 m
Bottom slope approx. 6.6 ‰
length 49.7 km
Catchment area 312.646 km²
Discharge at the Zollhaus
A Eo gauge : 239.2 km² 		NNQ (2003)
MNQ 1977–2007
MQ 1977–2007
Mq 1977–2007
 MHQ 1977–2007
HHQ (1978) 		99 l / s
330 l / s
1.77 m³ / s
7.4 l / (s km²)
 17 m³ / s
43.5dep1
Left tributaries Nesselbach , Lahnbach
(for these and others see section catchment area and tributaries )
Right tributaries Aubach , Palmbach
(for these and others see section catchment area and tributaries )
Medium-sized cities Taunusstein
Small towns Bad Schwalbach , Diez
Communities Hohenstein , Aarbergen , Verbandsgemeinde Hahnstätten , Verbandsgemeinde Diez
Aar near Bad Schwalbach

Aar near Bad Schwalbach

The Aar spring in a forest meadow near Taunusstein-Orlen

The Aar spring in a forest meadow near Taunusstein-Orlen

Adolfseck with the dammed loop of the river (left) and waterfall (right) in an engraving by Merian

Adolfseck with the dammed loop of the river (left)
and waterfall (right) in an engraving by Merian

Waterfall in Adolfseck; on the left the pressure line of the hydropower plant

Waterfall in Adolfseck; on the left the pressure line of the hydropower plant

The Aar is a 49.7 km long, south-south-east and left tributary of the Lahn . It flows into Hesse and Rhineland-Palatinate .

Surname

The water body name Aar occurs several times in German-speaking Central Europe. Examples are the Aar near Herborn , which is also part of the Lahn river system , the Ahr flowing into the Rhine, and the Aare in Switzerland . The pre-German word Aar means something like “fast-flowing water”, in the figurative sense “small river in the low mountain range”, and is preserved in many settlement names with the ending -ach , especially in southern Germany .

geography

course

The Aar rises at an altitude of 429  m above sea level. NHN in the Hessian part of the Taunus in the Rhine-Taunus nature park . Its source is in the Rheingau-Taunus district north of the Neuhof district of Taunusstein , but belongs to the area of ​​the Orlen district . About 500 m west-southwest are the remains of the Zugmantel fort on the Upper German-Raetian Limes .

First the Aar flows south and then in a wide basin southwest through the Taunusstein districts of Neuhof and Wehen , where it receives the Orlenbach flowing in from the north , and through the districts of Hahn and Bleidenstadt . After Bleidenstadt the river reaches its southernmost point and turns to the northwest. From then on the valley narrows significantly.

At Bad Schwalbach, the Aar absorbs the Nesselbach flowing through the city center and then reaches the Bad Schwalbach district of Adolfseck with the ruins of Adolfseck Castle . Here, at the end of an artificial meander neck puncture , it forms the largest waterfall (by volume) in the Taunus, although most of the runoff is diverted to generate energy. Immediately afterwards she crosses the Limes at the small fort Adolfseck .

Deep beneath Hohenstein Castle , the Aar passes through the heart of the Hohenstein community and shortly thereafter takes in the Lahnbach (Lahner Bach) on the left . Then it becomes the border river to Rhineland-Palatinate and thus the Rhein-Lahn district over a length of about 3 km above the Aarbergen district of Michelbach . Across the border lies the Sandersmühle animal body disposal facility in the valley .

In the municipality of Aarbergen, the narrow Aar valley widens again. The river first touches the Michelbach district, passes the Michelbacher Hütte near Kettenbach and receives its longest tributary here, the 15.1 km long and right-hand Aubach (formerly Strinzbach ), which rises 800 m northwest of the Aar spring. Then the valley leads to Hausen via Aar and to the last Hessian town of Rückershausen .

The remaining 14 km to the mouth of the Aar are entirely in Rhineland-Palatinate. In the Hahnstätten community , she touches the places Schiesheim , Zollhaus , Hahnstätten with a large lime works and quarry, Oberneisen , Niederneisen and Flacht .

With the villages of Holzheim and Freiendiez it reaches the Verbandsgemeinde Diez . Finally , the Aar flows into the southwest of the center of the city center of Diez at Lahn - river kilometer  84 and at an altitude of about 280  m above sea level. NHN in there coming from the north and turning west Rhein influx Lahn.

Its 49.7 km long run ends about 326 meters below its source, so it has a mean bed gradient of about 6.6 ‰.

Catchment area and tributaries

The catchment area of the Aar is 312.646  km² . Their tributaries include with orographic allocation (l = left-hand side, r = right-hand side) as well as water length , basin and MQ (viewed downstream) :

  • Erdenbach ( right ), 0.7 km
  • Wurzelbach ( left ), 1.2 km
  • Triebbach ( left ), 1.6 km
  • Landgraben ( left ), 0.6 km
  • Hasselbach ( right ), 1.2 km
  • Schwarzbach ( left ), 4.2 km, 8.7 km², 86.3 l / s
  • Orlenbach ( right ), 4.1 km
  • Eschbach ( left ), 1.1 km
  • Lauterbach ( left ), 1.2 km, 2.22 km²
  • Wingsbach ( right ), 5.0 km, 5.69 km², 50.7 l / s
  • Kotzebach ( right ), 3.3 km
  • Roßbach ( left ), 2.3 km
  • Eddersbach ( left ), 1.4 km
  • Mühlbach ( left ), 1.2 km
  • Laubach ( right ), 1.9 km
  • Herbach ( right ), 3.3 km
  • Hettenhainer Bach ( left ), 0.8 km
  • Busebach ( left ), 2.0 km
  • Nesselbach ( left ), 4.8 km, 13.2 km², 140.7 l / s
  • Bornbach ( right ), 0.5 km
  • Pohlbach ( right ), 1.5 km
  • Schafheckergraben ( right ), 1.5 km
  • Kohlbach ( left ), 2.1 km
  • Kohlgraben ( right ), 0.5 km
  • Gieshübeler Bach ( left ), 1.6 km
  • Breithardter Bach ( right ), 7.2 km
  • Vollmersbach ( right ), 1.3 km
  • Lahnbach (Lahner Bach) ( left ), 4.8 km, 8.46 km², 81.5 l / s
  • Hirschbach ( right ), 1.5 km
  • Graben to Sandersmühle ( left ), 0.6 km, 0.43 km²
  • Mahlberger Bach ( left ), 2.0 km, 1.62 km²
  • Michelbach ( right ), 5.0 km, 10.16 km², 70.6 l / s
  • Aubach ( right ), 15.1 km, 54.85 km², 366.0 l / s
  • Schaltbach ( left ), 1.5 km
  • Windbach ( left ), 1.5 km
  • Mattenbach (Frankenbach) ( left ), 2.7 km
  • Hahnerbach ( right ), 2.3 km
  • Schliembach (brook from the Ziegelhütte) ( left ), 2.3 km
  • Palmbach ( right ), 9.4 km
  • Hohlenfelsbach ( left ), 3.6 km
  • Merschelbach ( left ), 3.5 km
  • Kaltenbach ( right ), 6.4 km
  • Welsbach ( left )
  • Herbach (Mühlbach) ( right ), 4 miles
  • Haselbach ( left ), 3.0 km
  • Lohrbach ( right ), 1.7 km
  • Hohlbach ( left ), 1.8 miles
  • Hinterbach ( right )
  • Weibitzbach ( left ), 2.7 km

geomorphology

Talent emergence

The narrow valley of the Aar, like that of the Middle Rhine , arose over the past 700,000 years as a result of climatic , tectonic and eustatic changes in Central Europe . This could be demonstrated by means of several river terrace levels that can be detected at different points and with the loess deposited on them.

Floodplain sediments

In the upper reaches and in the upper middle reaches of the Aar between Wehen and Michelbach, only alluvial owes can be detected that were only deposited since the High Middle Ages . They are mainly the result of the first large-scale clearing and the introduction of arable farming in the south-western Lower Taunus . Older floodplain loams have also been identified on the lower middle reaches and the lower reaches of the Aar. Since the modern era at the latest , the influence of historical mining in the Zollhaus district and the high consumption of charcoal at Michelbacher Hütte have played a not insignificant role in the formation of floodplain sediments due to increased soil erosion .

Traffic in the Aartal

Particularly in the section from Adolfseck to Michelbach, the Aartal is narrow, partly gorge-like, cut into the Taunus, but strongly winding, wooded and sparsely populated and therefore interesting for tourists. By Aartal the lead here Aarstraße called national highway 54 and classified as single-track branch line Aartalbahn ; both lead from Wiesbaden via Hahn and via Diez to Limburg an der Lahn . Although passenger and freight traffic on the Aartalbahn has been discontinued step by step since 1983, the route has since been used for tourism with trolleys and by the Nassau Tourist Railway . For cyclists there is the Aartal-Radweg , which runs from Diez to Taunusstein-Hahn almost entirely on the edge of the floodplain of the river.

Events

In the Aartal, there are two events throughout the year that affect the entire Aartal and are organized across the federal states in Hesse and Rhineland-Palatinate: As part of the annual major event under the name Fahr zur Aar , the Aartal is from Diez to Bleidenstadt on a Sunday or public holiday at the end of May closed for motor traffic and is only available for non-motorized traffic. The Aartal Adventure Day is held every year on October 3rd, the day of German unity . The focus is on guided archaeological, geographical and forestry hikes as well as individual festivals with an autumn motto.

literature

Individual evidence

  1. ↑ a b c d Topographic map 1: 25,000 and database WFD Hessen
  2. ↑ a b GeoExplorer of the Rhineland-Palatinate Water Management Authority ( information )
  3. ^ German Hydrological Yearbook 2007. Accessed on April 11, 2016 . (PDF; 10 kB)
  4. ↑ Hans Krahe: Our oldest river names. 1964, OCLC 10374594 .
  5. ↑ Map services of the Federal Agency for Nature Conservation ( information )
  6. ↑ a b c d e Designation according to field names
  7. ↑ GKZ 2588114
  8. ↑ a b c d e Name on the property map at the Hessenviewer
  9. ↑ GKZ 2588116
  10. ↑ GKZ 2588132
  11. ↑ On WFD: Bach before the plate
  12. ↑ GKZ 258819914
  13. ↑ GKZ 258819918
  14. ↑ After the field names Laubachtal , Unterlaubach , Oberlaubach and Laubach
  15. ↑ GKZ 258819992
  16. ↑ GKZ 2588314
  17. ↑ GKZ 2588316
  18. ↑ Kohlgraben probably wrongly in WFD
  19. ↑ GKZ 2588398
  20. ↑ GKZ 2588512
  21. ↑ With the property card: Lohnebach
  22. ^ W. Andres: Morphological investigations in the Limburg basin and in the Idsteiner Senke. (Rhein-Mainische Forschungen, 61). 1967.
  23. ↑ C. Stolz, J. Grunert: Floodplain sediments of some streams in the Taunus and Westerwald Mts., Western Germany, as evidence of historical land use. In: Journal of Geomorphology. 52, 2008, pp. 349-373.
  24. ↑ Christian Stolz, Jörg Grunert, Alexander Fülling: Quantification and dating of floodplain sedimentation in a medium-sized catchment of the German uplands: a case study from the Aar Valley in the southern Rhenish Massif, Germany. In: The Earth. 144, 1 (2013), pp. 30-50, on die-erde.org

Web links

Commons : Aar  - collection of images