DC2 Semin Dune EarthCache
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Difficulty:
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Terrain:
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Size: 
(not chosen)
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DC nebli Draci cache je serie prirodnich kesi. Cilem teto kese je
Vam ukazat posledni zbytek puvodni pudy na brezich reky Labe. DC,
alias Dragon Caches, is series of natural caches. The aim of this
EarthCache is to show you the last remainder of primary type of
ground around the river Elbe. DC neboli Draci Cache je serie
prirodnich cachi.
TATO CACHE JE DOBROVOLNA. NIKDO NENI NUCEN K JEJIMU ODLOVU !!!
ODLOVU SE KAZDY UCASTNI NA VLASTNI NEBEZPECI.
Seminsky presyp je posledni zbytek piskoveho utvaru. Tento utvar
byl pozde pleistocenskou terasou. Cely utvar byl tvoren vatymi
pisky.
Vetsina piskoveho valu byla znicena ve stredoveku zakladanim
rybniku a nasledne pak regulaci toku reky Labe.
PROTO NECEKEJTE ZADNOU EXTRA DUNU. JEDNA SE O POSLEDNI ZBYTEK A
JE TO SKUTECNE JEN "PISKOVISTE". Bohuzel ochranari se dokonce
obavaji, ze ani toto "piskoviste" nedokazi udrzet a casem
zanikne.
Vse zajimave o tomto utvaru si muzete precist na uvodnich
souradnich na naucne ceduli.
Vasim ukolem je vyfotit se s ceduli a poslat mi tuto fotku na
jirin.nozicka@seznam.cz
The Semin dune is the last remainder of The Great sand dune. This
dune is the remainder of The Late Pleistocene terrace of the river
Elbe. It is formed by Aeolian (blowing) sand.
The Pleistocene epoch on the geologic timescale is the period
1.808.000 to 11.550 years before present. The Pleistocene epoch had
been intended to cover the world's recent period of repeated
glaciations.
Pleistocene climate was characterized by repeated glacial cycles
where continental glaciers pushed to the 40th parallel in some
places. It is estimated that, at maximum glacial extent, 30% of the
Earth's surface was covered by ice. In addition, a zone of
permafrost stretched southward from the edge of the glacial sheet,
a few hundred kilometers in North America, and several hundred in
Eurasia. The mean annual temperature at the edge of the ice was
-6°C; at the edge of the permafrost, 0°C.
In the Glacial cycles of the Late Pleistocene were warmer and
colder times. In the colder times (Glacials) rivers have less water
because there was less water in oceans (Water was frozen in the
glaciers). But less water ensured higher potential energy of the
rivers. This energy provides erosion of valleys into the depth
through the upper section (hard ground). After Glacials came warmer
Interglacials, which raised the sea level and in the rivers there
was more water. This water mass extend thin river-basins and made
the Pleistocene terraces. This erosions breach the hard ground
sections and the blowing sand sections were uncovered.
The terrace called The Great sand dune was destroyed in the middle
age by the fishpond cultivation. The remainders of this dune were
destroyed by the river Elbe basin regulation. The Semin dune is the
last remainder of The Great sand dune in Eastern Bohemia.
It is an important site of sandphille plants in Eastern Bohemia.
The rarest plant found here is Astragalus arenarius. Next to it,
there is Agrostis coarctata, Veronica prostrata and another 80
types of plants. There are lot of animals too. For example
Myrmeleon formicarius live here.
Your goal is to measure the width of this dune and measure its
elevation above sea level. And send me this data by email with your
photo near to dune.
Additional Hints
(No hints available.)