Laxá í Aðaldal
| Laxá í Aðaldal | ||
 Laxá from the bridge over road 848 |
||
| Data | ||
| location | Iceland | |
| River system | Laxá í Aðaldal | |
| Outflow of |
Mývatn 65 ° 35 ′ 30 ″ N , 17 ° 5 ′ 0 ″ W. |
|
| Source height | 288 m | |
| muzzle | in Skjálfandi Bay in the Arctic Ocean Coordinates: 65 ° 59 ′ 30 ″ N , 17 ° 25 ′ 20 ″ W 65 ° 59 ′ 30 ″ N , 17 ° 25 ′ 20 ″ W |
|
| Mouth height | 0 m | |
| Height difference | 288 m | |
| Bottom slope | 5.1 ‰ | |
| length | 56 km | |
| Catchment area | 2150 km² | |
| Drain |
NNQ MQ HHQ |
35 m³ / s 44 m³ / s 70 m³ / s |
| Flowing lakes | Mývatn | |
The Laxá í Aðaldal is a headwaters in northern Iceland .
Surname
As the name ( German "salmon river" ) suggests, it is a popular fishing river. Some salmon rivers in the country bear the name Laxá . They differ in their name additions, in the respective area they are usually called Laxá for short .
The river bears the names Laxá í Mývatnssveit and Laxá í Þingeyjarsýslu after the districts .
course
The Laxá is the outflow from Lake Mývatn , it runs through the valleys Laxárdalur and Aðaldalur , past the Grenjaðarstaður turf farm , to NNW and flows south of Húsavík into the Skjálfandi bay . Approx. 340 small islands, on which there are many breeding areas, are located in the river. Shortly before the estuary are the 3 m high Kurzðarfossar .
geology
Laxálava
The bottom of the valley is covered with lavas that come from the craters of the Krafla system and are several thousand years old. The older lava layer was formed before 3800 years, the younger 2700 years ago. The lavas flowed about 70 km to the sea and formed pseudocraters and hornitos where they encountered wetlands . Lake Mývatn also owes its existence to these volcanic eruptions, as the lavas clogged the river valley and dammed the lake.
The so-called older Laxálava emerged from the shield volcano Ketildyngja approx. 3,800 years ago , located approx. 25 km in the southeast of Mývatn. The lavas flowed through the narrow Selhjallagil gorge into the lake area and changed it thoroughly by damming drains and thus forming the first lake in the area. The lavas then followed the Aðaldalur and poured into the Skjálfandi bay at a distance of 50 km.
About 2,000 years ago, new eruptions took place, which produced large flows of lava. These are the so-called Younger Laxálaves , which flowed out of the Þrengslaborgir-Lúdentsborgir crater.
Hornitos in Aðaldalur
The lava flows from the Laxálaves covered wetlands in the valley. There were smaller phreatic explosions that created pseudocraters and hornitos , similar to those in Skútustaðir or in the case of the Rauðhólar near Reykjavík . Such small craters do not have direct access to a magma reservoir .
Some hiking trails lead through the field of the Hornitos and at least one of the Hornitos is very easily accessible and walkable, it is called Knútsstaðaborg . On the other hand, one must also be careful not to plunge into hidden caves or crevices in the lava field, as happened to the local farmer Steingrímur Baldvinsson , who had to spend a few days in such a cave before he was found, but the time was useful to write poetry used.
fauna
The upper course of the river near the Mývatn is a breeding area for flies and therefore also for many bird species. One finds there in early summer z. B. the very colorful males of the collar duck .
It is also one of the most famous salmon rivers in Iceland.
traffic
The river is easily accessible and bridged in many places, and there are also numerous well-known fords in it.
Power plants
On the lower reaches of the river there are three hydropower plants with a total output of 28 MW .
The first of the power plants was built in 1938–39, mainly to supply the city of Akureyri with electricity.
The Laxá I, II and III power plants produce 5, 9 and 13.5 MW of electricity respectively.
In 1970 a dam wall, the third power plant, was built into the river. The Mývatn should have been dammed a few meters. The local farmers were against it and blew up this wall. The documentary Hvellur (Eng . Bang ) from 2013 reports on it. Only after 40 years were witnesses and those involved ready to speak about it. The third power plant was later built smaller and there was a stipulation that no further hydropower plants could be built on the Laxá.
See also
Web links
- Hornitos in Aðaldal (Spanish, with photos)
Individual evidence
- ↑ a b c Angling.is: Salmon Rivers; accessed: September 12, 2012
- ↑ a b c d Íslandshandbókin. Náttúra, saga og sérkenni. 1. bindi. Edited by T. Einarsson, H. Magnússon. Örn og Örlygur, Reykjavík 1989, p. 490
- ^ HU Schmid: Dictionary Icelandic - German. Buske, Hamburg, 2001, 140
- ↑ cf. Ísland Vega Atlas. Ed. Ferðakort, Reykjavík 2006, 17 and 18
- ↑ Thor Thordarson, Armann Hoskuldsson: Iceland. Classic Geology in Europe 3. Terra, Harpenden 2002, 145
- ↑ Thor Thordarson, Armann Hoskuldsson: Iceland. Classic Geology in Europe 3. Terra, Harpenden 2002, 146
- ↑ Thor Thordarson, Armann Hoskuldsson: Iceland. Classic Geology in Europe 3. Terra, Harpenden 2002, 146f.
- ↑ Aðaldalur. Un campo de hornitos producido por erupciones desenraizadas ; accessed: September 12, 2012
- ↑ Páll Ásgeir Ásgeirsson: 101 Ísland. Áfangastaðir í alfaraleið. Reykjavík, Mál og Menning, 2008, 53
- ↑ http://www.nna.is/frettir/nr/297/ ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. Náttúrústofa Norðausturlands: Náttúrustofan rannsakar straumendur ; accessed: September 12, 2012
- ↑ http://angling.is/en/waters/salmon-rivers/on-the-northeast-coast/6485/ Angling.is; accessed: September 11, 2012
- ↑ Archived copy ( memento of the original dated August 29, 2012 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Landsvirkun: Laxá Power Stations ; accessed: September 13, 2012
