česky english deutsch <<< >>>

The Desert and the River

THE ORIGIN OF DRIFT SANDS

Let’s try to travel back in time to the last ice age; the landscape looked completely different from the one we live in nowadays – dry grasslands (steppes) alternated with cold tundra and barren mountain ranges. Wild, powerful rivers carried a lot of gravel and sand down from the mountains, depositing it further down in the lowlands. There the streams cut their way through thick layers of these sediments, creating complex river deltas with many separate stream beds and small gravel islands.

Some 15,000 years ago, the climate changed. The ice age was coming to an end. The character of the rivers also changed – they settled in relatively stable meandering beds and kept cutting deeper and deeper through the gravel and sand sediments. This is how “river terraces” were formed.

Their surface was gradually overgrown with thin vegetation. This meant that only the finer particles of sand could be blown away by strong winds, which then deposited them between Moravsky Pisek, Vracov, and Rohatec, creating 10–30 meters (roughly 30–100ft) thick layers of drift sands.

Similar drift sands, although much less extensive, can be found in the Czech Republic also along the Elbe River and in the Trebon area famous for its wetlands and ponds.

GPS position

N 48° 55.947', E 17° 16.826'
[GPX]

[MAPY.CZ]

Contact

Vzdělávací a informační středisko Bílé Karpaty, o.p.s.
Marie Petrů
Tel.:518 322 545
e-mail:visbk@bilekarpaty.cz
http://www.bilekarpaty.cz