Börßum-Braunschweiger Okertal
| Börßum-Braunschweiger Okertal | |||
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| Systematics according to | Handbook of the natural spatial structure of Germany | ||
| Main unit group | 51 → Northern Harz foreland |
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| 4th order region (main unit) |
512 → East Brunswick hill country |
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| 5th order region | 512.0 → Okerrandhöhen |
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| 6th order region | 512.03 → Börßum-Braunschweiger Okertal |
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| Geographical location | |||
| Coordinates | 52 ° 8 '20 " N , 10 ° 58' 11" E | ||
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| state | Lower Saxony | ||
The Börßum-Braunschweiger Okertal is a river landscape of the Oker between Börßum in the south and the Braunschweiger inner city in the north with an extension of over twenty kilometers. The valley is formed in the west by the Oderwald , the Thieder Lindenberg and its foothills and in the east by several chains of hills and the Ösel , all of which are assigned to the natural area of East Brunswick hill country .
description
Natural spaces and geology
The Börßum-Braunschweiger Okertal connects directly to the Okertal , which extends as a sub-area of the Harzrandmulde (natural area 510) between the place Oker and Werlaburgdorf am Oderwald. To the east, the wetland of the Großer Bruch (511) extends and separates the Harz rim basin from the hill country of East Brunswick.
In the west the valley is formed by the heights of the Oderwald (512.01), the Thieder Loßhügelland (512.02) with the Lindenberg as an outstanding elevation and its foothills up to the Steinberg in Broitzem . Then the Braunschweig-Hildesheimer Lößbörde extends as far as the Okertal. The transition from the Börde to the Geest runs in Braunschweig's core city. In the Lower Okertal (623.07), a sub-area of the Burgdorf-Peiner-Geestplatten , the Oker continues its course. The western Okerrand heights are predominantly chalk formations, only the Thieder Lindenberg has red sandstone formations from the Triassic .
The eastern edge of the valley between Börßum and Ohrum is determined by the chalk formations of the Remlinger Loessmulde (512.10), which predominantly emerge as claystone and contain numerous water-bearing cuttings. Between Ohrum and Wolfenbüttel the valley widens towards the Ösel (512.04), which is dated to the Triassic. In the Linden district of the city of Wolfenbüttel, various rocks from the Jura and Triassic appear on the surface and form a clear demarcation from the diluvial river valley.
To the north of Wolfenbüttel the Oker extends the Salzdahlumer Hügelland (512.05) to the right and forms a clear valley situation with the Schieferberg . Here, too, the rocks from the Cretaceous period predominate. At the right edge of the valley ends in Brunswick the East Brunswick hill country and merges into the East Brunswick lowlands (624).
The rivers Oker, Ilse and Warne
The lowlands of the Okertal near Werlaburgdorf are at an altitude of around 85 m above sea level. NHN . Between the 128-meter-high Steinberg, a foothill of the Oder Forest, and the Fuchsberg , which rises up to 111 meters on the east bank, the valley is around two kilometers wide. It takes next to the former in the middle meandering Oker two other rivers: From the west of the flows around Salzgitter coming Warne to Oderwald and from the southeast flowing from the Brocken area which Ilse added. Both tributaries originally flowed into the Oker several kilometers north. The Warne flows from the left at Dorstadt into the Oker, while the Ilse previously only reached the Oker from the right shortly before Ohrum . After extensive oker regulation from the 1950s, the mouth of the Ilse was moved upstream to Börßum. The Oker was led into the bed of the former Ilse and her old meanders were filled in. The old Ilse is still there at Pilsenbrück . Some of the meanders of the Oker have recently been connected to the Warne near Heiningen.
All three rivers shape the flat valley with their clay deposits, in contrast to the stone fields with their thick layers of gravel that predominate in the upper reaches of the Oker. From the left, i.e. from the Oderwald, there are no notable tributaries. The water seeping into the Oder forest emerges on its western slopes ( Fuhse , Brückenbach ). The chain of hills on the right bank, on the other hand, has numerous bodies of water in its incisions: The Hasenbeeke flows through a longer valley area near Börßum and extends almost to Hedeper ; the Hahnenbeek runs in a deep gorge near Bornum , and the Scharrenbeeke, now known as the Großer Graben , flows into the Alte Ilse near Pilsenbrück .
Valley cross-sections
The confluence of the Alte Ilse in the Oker occurs at a height of 80 meters immediately west of Pillowbrück. From here the Oker is the only river in the valley. At the foothills of the Ösel, south of Neindorf , the Okertal narrows to just under 300 meters near Ohrum and, with its gravel banks, offered a significant transition here as early as the Middle Ages. In the further course the valley widens again between the edge of the Oderwald and the Ösel, becomes more than a kilometer wide and offers a passage between Ösel and Wolfenbüttel-Linden of the Altenau flowing from the Elm . At Halchter , the valley narrows again to a few hundred meters. The northern foothills of the Oder Forest also end here.
Below Wolfenbüttel , the valley between the Thieder Lindenberg and the Schieferberg again reaches a width of one kilometer and does not experience any significant narrowing. On the right edge of the valley in the Braunschweig kennel area, the Zuckerberg with its chalk rock rises a little steeper before the valley merges into the Geest landscape.
The area between Wolfenbüttel and Braunschweig is assigned to the urban landscape of Braunschweig by the Federal Agency for Nature Conservation with the code number 115 (“agglomeration”).
