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13.
Spremembe strukture toka zaradi obrežne zarasti v vodotokih
Steinman, Franci ; Končar, Bojan
Sonaravno urejanje oz. renaturacije že reguliranih vodotokov mora upoštevati manjšo pretočno sposobnost vodotoka, zato so potrebni dodatni ukrepi. Poleg tega se spreminja tudi struktura in dinamika ...vodnega toka. Obrežna zarast povzroči prerazporeditev izotah, pojav izrazitih sekundarnih tokov in s tem prerazporedoitev strižnih napetosti po ostenju. V LMTe razviti matematični model je uporabljen za simulacijo medsebojnega vpliva vzdolžnih hitrosti, strižnih napetosti in poteka sekundarnih tokov v odprtih (tudi zaraščenih) vodotokih. Rezultati, predvsem porazdelitve strižnih napetosti po ostenju, kažejo mehanizem, zaradi katerega nastaja znaten del škode ob poplavah - to je zamašitev prepustov in mostnih profilov z rastlinjem, odnešenim s poplavnega področja predvsem zaradi bočne erozije. Pri renaturacijskih posegihje zato potrebno razjasniti nekatera ključna vprašanja
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