[CZ]: Uvodni souradnice vas zavedou k rozcestniku na parkovisti, kde motorizovani mohou zanechat sve priblizovadlo. Zde take zacina naucna stezka obcanskeho sdruzeni Nesehnuti, na ktere se muzete dozvedet o vzniku Brnenske prehrady, o flore a faune lokality a o geologickych procesech minulych a take soucasnych, stale utvarejicich toto udoli. Nektere tabule naucne stezky vcetne te prvni na uvodnich souradnicich byly bohuzel zniceny vandaly, cestou vsak narazite i na dalsi z "konkurencni" naucne stezky Povodi Moravy a o podstatne zajimavosti tak neprijdete.
Cela trasa naucne stezky kopiruje cervenou turistickou trasu a je dlouha priblizne 2 km. Od rozcestniku se vydejte doprava k hrazi a dale za ni.
Prehradni hraz byla velmi vhodne vybudovana v miste, kde byvala siroka udolni niva reky Svratky a prechazela do kratkeho sevreneho udoli. Pri pohledu proti proudu se nam naskytne pohled na Kninicskou kotlinu, nyni vyplnenou vodami Brnenske prehrady. Snizenina je lemovana vysokymi a pomerne strmymi svahy, ktere svym sklonem vyrazne kontrastuji s sirokym a rovnym dnem stareho ricniho udoli Svratky a nyni take s vodni hladinou prehrady. Kotlina je protazena ve smeru severozapad-jihovychod a jeji maximalni delka cini 2,8 km ve smeru toku. Okoli prehrady je mozne charakterizovat jako clenitou pahorkatinu s relativnimi vyskovymi rozdily 75-150 metru. Nejvyssim bodem okoli prehrady je vrchol kopce Trnovka (441 m), ktery se naleza na levem brehu. Pri pohledu na celkovy tvar kotliny nas muze zaujmout rozdilna strmost svahu na levem a pravem brehu. Levy breh ma svahy prikrejsi - spadaji k hladine prehrady pod uhlem presahujicim 5°. Takovy typ kotliny byva oznacovan jako sklonove asymetricka. Hlavni pricinou vzniku takto tvarovane kotliny byly pohyby zemske kury v davnych geologickych dobach.
Stejne pohyby ovlivnily take vznik kratkeho udoli spojujiciho Kninicskou kotlinu s nize po proudu lezici kotlinou Bystrckou (pohled z hraze po proudu reky Svratky). Udoli ma charakter tzv. prulomoveho udoli, ktere je typickym prvkem reliefu Brnenskeho masivu. Nikde jinde v Ceske republice se nevyskytuje tak velky pocet techto udoli na uzemi obdobne plosne rozlohy. Prulomovym udolim muzeme rozumet takove udoli, ktere z uzemi relativne nizsiho reliefu (Kninicska kotlina) prorazi napric relativne vyssim reliefem a opet vstupuje do podstatne nize polozeneho uzemi (Bystrcka kotlina). Dalsi prulomove udoli spojuje napriklad Bystrckou a Zabovreskou kotlinu lezici po proudu reky Svratky.
Dukazy o puvodu prulomoveho udoli reky Svratky mezi Kninicskou a Bystrckou kotlinou podaly vysledky pruzkumnych praci pri stavbe prehrady, ktere zjistily pritomnost poruch v zemske kure ve smeru severozapad-jihovychod. Dalsi dukaz podava pricny rez prulomovym udolim - plosiny vytvorene pri jizni a severni strane udoli lezi v odlisne nadmorske vysce. Obe dve jsou pritom vytvoreny stejnym materialem a jsou take pravdepodobne stejne stare. Dalsim dukazem je smer uboci obou udolnich svahu - neprobihaji spolu rovnobezne, jak by tomu muselo byt u udoli vytvoreneho hloubkovou erozi vodniho toku v celistve hornine, ale rozbihaji se tak, ze udoli se nalevkovite rozevira smerem k vychodu.
Vrtne prace provedene pri stavbe prehrady v recisti Svratky ukazaly, ze prulomove udoli ma dno ze skalnich hornin, ktere bylo pozdeji pokryto ricnimi sterky a pisky. V miste prehradni hraze byly ve dne reciste nalezeny tzv. evorzni kotle - misovite tvary svedcici o puvodne prudkem toku reky Svratky v dobe, kdy si razila cestu mezi obema kotlinami. Neni vyloucene, ze v te dobe zde docasne existoval vodopad.
Zdroj: naucna stezka
Ukoly pro uznani logu:
Puvodne jsem chtel, abyste se vyfotili u zajimavych abraznich srubu podel prehrady, ale protoze v nich hnizdi silne ohrozeny lednacek ricni a protoze uz nelze povinne foto vyzadovat, vase ukoly budou jine. Kdybyste si presto chteli prohlednout abrazni sruby z dalky, mate moznost na souradnicich N 49° 14.709 E 016° 30.383. Z tohoto neprilis vabneho mista je muzete videt na protejsim brehu asi 50 metru severozapadne.
Nepouzivejte novy Message Center, ten nectu a otazky budou povazovany za neodpovezene!!! Vasim ukolem je projit si trasu naucne stezky a zaslat mi e-mailem pres profil:
- cislo tabule z praveho horniho rohu a zde zmerenou nadmorskou vysku z nejvyse polozeneho mista na stezce.
- Formovani udoli se nezastavilo a jednim z geologickych procesu, ktery muzeme pozorovat, je vlnova abraze brehu prehrady. Napiste mi dle vlastni uvahy alespon dve priciny, proc zde k vlnove abrazi dochazi.
[EN]: The starting coordinates bring you to signpost at a public parking where you can leave your car. The nature foot trail also starts here and will show you how the Brno dam was built, about flora, fauna and also about geological processes which formed and are still forming this valley. Some of the info-boards were vandalised but you won't miss all the important information.
The foot trail copies the red pathway and is about 2 km long. From the signpost go to the right, to the dike.
The dam was built at location where the wide floodplain of Svratka river met short and narrow valley. If you look from the dike to the basin, you can see different tilt of the left and right bank. This is called asymmetric basin and is usally formed by crustal movements in early geological ages.
These movements influenced also the valley formation. It has character of so called water gap, a typical element of Brno Massif. Water gap is an opening or notch which flowing water has carved through a mountain range. Another water gap connect e.g. Bystrc and Zabovresky basins more down the river.
The water gap origin was confirmed by exploration during the dam construction when crustal disruptions were found. Another evidence is given by the lateral cut of the water gap - the tables formed on the north and south sides are at different altitude but are from the same materials and are probably the same age. Near the dike, a cauldron-like evorsion hollows were found. This indicates that a rapid river flow was here when the Svratka river blazed the way through the rocks. It's possible than even a waterfall was here.
Information source: the nature foot trail info-boards
To log the cache
Your task is to visit the foot trail and send me by e-mail via my profile:
- the number of the board from the upper right corner and here measured altitude at the highest location on the trail.
- The formation of the basin has not ended. One of the geological processes we can see here is the wave abrasion of the river banks. Write me at least two factors which induce the wave abrasion here.
Listing seen since 11-07-2010: 
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