Cloudbursts near Trendelburg

from Wikipedia, the free encyclopedia
View of the wet cloudburst

The cloudbursts -  Nasser downpour (or Big downpour ) and dry downpour (or Little downpour ) - two near the nucleus of the city Trendelburg location and sinkholes formed Grikes in northern Hesse Kassel district ( Germany ).

The two sinkholes are each designated as a natural monument (ND) and as a geotope . The wet cloudburst , which is also under nature protection, is the largest sinkhole funnel in the southern Lower Saxony-North Hessian red sandstone landscape on the Upper Weser .

geography

location

The cloudbursts are 1 km east of the center of Trendelburg and 1.2 km west of the Trendelburg district of Friedrichsfeld . At the upper edge of a forest area that slopes down to the Sauerbach, they are 300 m south (wet cloudburst) and 400 m southwest (dry cloudburst) of the farmstead settlement Saurenthal , also called Saures Valley , in an agricultural area . South of the cloudbursts, the short Sauerbach feeds the 1.4 km long Friedrichsfelder Bach, which flows into the Diemel in the Trendelburg core town .

Natural allocation

The cloudbursts belong in the natural spatial main unit group Weser-Leine-Bergland (No. 37) and in the main unit Solling, Bramwald and Reinhardswald (370) to the sub-unit Reinhardswald (370.4). To the west the landscape falls into the subunit Hofgeismarer Rötsenke (343.4), which belongs to the main unit group West Hessisches Bergland (34) to the main unit West Hessische Senke (343).

The downpours

Wet downpour

The wet cloudburst ( large cloudburst ;  ⊙ coordinates: 51 ° 34 ′ 32.3 ″  N , 9 ° 26 ′ 46 ″  E ) is on the edge of a spacious plateau with fields, meadows and farms on the edge of the forest, hidden between sometimes strangely overgrown trees, which are 200 to 300 years old in the upper part of the funnel. Its upper edge is about 195  m above sea level. NHN .

The Wet downpour is total reported variously as 47 to 60 m deep and has m at the almost circular top around 470 m circumference at about 150 diameter. In its interior a small lake has formed which - depending on the water level - has a diameter of 45 to 60 m and is 9.5 to 14.5 m deep; According to other information, it is a maximum of 16 m water depth. According to the various statements, about 325,000 m³ or 353,400 m³ collapse funnel is filled with about 22% water. This earned him the nickname wet cloudburst .

The wet cloudburst is located in the cloudburst fauna-flora-habitat area near Trendelburg (FFH no. 4422-308; 3.14  hectares in size).

Dry downpour

The dry cloudburst ( small cloudburst ;  ⊙ ) is about 400 m further west on the other side of the fields at the edge of the forest and is just as well hidden between trees. The collapse funnel, around 23 m deep and 70 m wide, is around 4,000 m³ in size. It is not filled with water, which is why it is called dry cloudburst . Its upper edge is about 200  m above sea level. NHN .

Geological origin of the wet cloudburst

geology

Both cloudbursts are in the layers of the Upper Bunter (Röt) under which the Zechstein - salt ( salt dome is located), which in the late Paleozoic was deposited by salt water condensation in hot and dry climates.

Around 250 million years ago with the beginning of the Mesozoic Ages , red colored sediments and sedimentary rocks were gradually deposited on the Zechstein with a thickness of well over 1000 m and solidified mainly into sandstones . At the turn of the New Age , around 65.5 million years ago, these deposits were removed to the Middle Buntsandstein .

In the recent geological past, the salt rocks in the subsurface were gradually removed by fresh groundwater at a depth of between 900 and 1,300 m, which initially created a primary cavity. The top layers broke into this cavity. A secondary cavity was created above them, which in turn enabled the two sinkholes of the cloudbursts in historical times .

legend

A legend has an explanation for the genesis of the strange funnel :

“Trendula, one of the three Reinhardswald giants and namesake of the city of Trendelburg, was full of resentment towards her sisters Saba and Brama. On a bad weather night, the two were on their way back from visiting their father, the giant Kruko, to their own castles when the hateful Trendula ambushed them and assassinated Brama from behind. For days there had been downpours and strong thunderstorms in the area of ​​the murder site and the just punishment was not long in coming: The murderer was struck by lightning and the ground opened up in the thunder and swallowed Trendula. "

Name interpretation or origin

The origin of the name of the cloudbursts , which emerged from the legend, is not so absurd ; because if you disregard the mythical, a storm that lasts for days with heavy precipitation remains a defining natural event that is quite suitable to bring the thin cover of an underground washout in the Zechstein to collapse and to cause the vernacular, which was inexplicable at that time - at least in the context of the legend suddenly existing, but actually 250 million year old earth funnel cloudburst .

Sign wet cloudburst

Traffic and walking

About 330 (dry cloudburst) to 130 m (wet cloudburst) south past the cloudbursts leads the state road  763, which branches off the federal road 83 in the Trendelburg core town and runs eastward to Friedrichsfeld and then on to Gottsbüren ; south of Trendelburg the B 83 and east of the village the L 763 is part of the German Fairy Tale Route .

A shared section of the Diemel Cycle Path and the Märchenland Path runs through the Trendelburg core town and thus near the cloudbursts . Northwest, west and south past the cloudbursts, the Reinhardswald-Westweg, which meets both paths in Trendelburg, leads through the village and through the valley of the Friedrichsfelder Bach . About 100 m from this path and 1.2 km east of the aforementioned road junction there is a parking bay on the L 763 in the Sauerbachtal at the lower edge of the forest, where the sign Nasser Wolkenbruch and an information board point to both collapse funnels. From there a short path leads steeply uphill through the forest to the wet cloudburst , which is followed by a forest edge path westwards to the dry cloudburst .

See also

References and comments

  1. ↑ a b c d e Map services of the Federal Agency for Nature Conservation ( information )
  2. ↑ a b c d e f g h i j k l m n o p Seasons - Geotopes: Winter 2008/2009 , information on the downpours and their geotope numbers [4422-5 (wet cloudburst) and 4422-4 (dry cloudburst ) ] at the Hessian State Office for Nature Conservation, Environment and Geology , on hlnug.de
  3. ↑ a b c d e f Jochen Lepper: Information board Nasser Wolkenbruch (at L  763 / Parkbucht), from the Lower Saxony State Office for Soil Research (today State Office for Mining, Energy and Geology ), Hanover, on yelp.de
  4. ↑ Water map service of the Hessian Ministry for the Environment, Climate Protection, Agriculture and Consumer Protection ( information )
  5. ^ Jürgen Hövermann: Geographical land survey: The natural space units on sheet 99 Göttingen. Federal Institute for Regional Studies, Bad Godesberg 1963. →  Online map (PDF; 4.1 MB)
  6. ^ Hans-Jürgen Klink: Geographical land survey: The natural space units on sheet 112 Kassel. Federal Institute for Regional Studies, Bad Godesberg 1969. →  Online map (PDF; 6.9 MB)
  7. ↑ a b sign wet cloudburst (at L  763 / parking bay), on commons.wikimedia.org
  8. ↑ Average water level ( wet cloudburst ):
    (9.5 + 14.5) (lake depth depending on the water level) / 2 = 12 (Wassert-water depth) / (47 + 60 m) = 53.5 m (⌀-funnel total depth) = 0.22 = ~ 22%

Web links