Längental (Stubai Alps)
| Longitudinal valley | ||
|---|---|---|
 Längental with Längentalbach and Niedermoor |
||
| location | Tyrol , Austria | |
| Waters | Längentalbach | |
| Mountains | Stubai Alps | |
| Geographical location | 47 ° 11 '34 " N , 10 ° 59' 36" E | |
|
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| height | 1900 to 2500 m above sea level A. | |
| length | 5 km | |
The Längental is a side valley of the Nedertal near Kühtai in the Stubai Alps in Tyrol . The Längentalbach flows through it. The underground rock is Central Eastern Alpine Ötztal-Stubai crystalline , an acidic, weathering silicate rock. The Längental is characterized by humid habitats such as fens and alpine gravel beds. Away from the stream, alpine heaths , lawns, forests and dumps form the typical habitat mosaic at this altitude level.
geography
The Längental branches off below the Kühtaisattel from the Nedertal to the south and bends to the west after about 4 km. In the west it is separated from the Mittertal by a ridge that runs from the Hochwanner ( 2488 m ) over the Vorderen ( 2528 m ) and Hinteren Mittertalkopf ( 2640 m ) to the Roten Kogel ( 2827 m ). In the east, a ridge that extends from the Mute ( 2398 m ) over the Zwölferkogel ( 2988 m ) to the Sulzkogel ( 3016 m ) borders the Längental from the Finstertal. At the end of the valley there is a high alpine transition into the Ötztal via the Niederreichscharte ( 2728 m ) . At the exit to the Nedertal is the Längental reservoir of the Sellrain-Silz power plant group .
Habitats
Stone pine forest
Stone pines ( Pinus cembra ) grow in loose stands on the steep slopes of the Längenental. Green alder ( Alnus viridis ), juniper ( Juniperus communis ) and mountain pine ( Pinus mugo ) dominate the bushes .
Heathens
Different heather types have established themselves in the valley, depending on the exposure and the subsoil. Pine bushes and alpine rose dwarf shrub heather form a medium-sized, robust shrub population. More exposed lichens are formed by cryptogams , grasses and other low-growing species.
Block heaps
Cryptogam-rich societies settle on and between the silicate rubble of the slopes in the Längental valley .
Bürstling grass grass (Nardeten)
In the lean subalpine-alpine Sauerbodenrasen, numerous other grasses and herbs thrive in addition to the Bürstling that gives it its name . Bürstling lawns are very undemanding and resistant to grazing cattle. Numerous insects, spiders and ground dwellers live here.
Fens
In Braunseggen low moors, brown mosses ( Amblystegiaceae ) and sedges ( Carex ) grow over a thin layer of peat . Species living here are adapted to the humid and nutrient-poor conditions and are often poorly competitive.
Trickle & spring corridors
On steep rocks covered with water, the high humidity and constant temperature conditions mean that types of trickle beds such as the ice sedge ( Carex frigida ) thrive .
Around spring outlets, highly specialized mosses and vascular plants form rare, colorful biotopes , so-called spring corridors.
Längentalbach
The 6.2 km long Längentalbach rises at almost 2600 m between the Wechner- and Hochbrunnachkogel and flows into the Längental reservoir at the exit of the valley. The Längentalbach is an unregulated mountain stream . Steeper sections with higher flow speeds alternate with wider meanders . Gravel and sand banks have formed here in places , which are repeatedly turned over and washed over. Only a few, special pioneer species can thrive on these dynamic areas. In these quieter places have pools formed. The water is the habitat of aquatic mosses (e.g. hygrohypnum ), algae , macrozoobenthos (e.g. fly larvae species) and amphibians .
Kühtai storage facility
In May 2020, construction work began in the Längental to create another reservoir for the Sellrain-Silz power plant group . For this purpose, the bottom of the Längental valley is milled out and a 113 m high dam is built. The storage facility should have a volume of 31 million m³ and a storage target of 2140 m . 80% of the water from the Fernaubach, Daunkogelfernerbach and Unterbergbach streams from the Stubai Valley and the Fischbach , Schranbach and Winnebach streams from side valleys of the Ötztal are to be pumped into the reservoir.
Web links
Individual evidence
- ^ Opinion of the Tyrolean environmental advocate. Retrieved May 23, 2020 .
- ↑ TIRIS - Tyrolean spatial information system
- ↑ Start of construction of the Längental storage facility. May 23, 2020, accessed May 23, 2020 .
- ↑ Kühtai storage power plant - project presentation , TIWAG