Abstract
Along the paper, we presented an analysis of changes of cross-sections morphology within the regulated reach of a mountain river. The river engineering works there were done by building cable block ramp. The studied reach was located in the Czarny Dunajec river. Analyzed reach of the river consisted of 100-m long segment upstream of the existing block ramp and 65 m downstream of it. The analysis was done based on field measurements, numerical modeling with HEC-RAS and Hjulström’s graph. Numerical modeling was conducted for observed flood Qfl ood = 16.9 m3·s–1 on 5 August 2013, and for the t-years floods: Q50% = 59 m3·s–1, Q25% = 99 m3·s–1, Q10% = 165 m3·s–1 and Q1% = 321 m3·s–1. For the analyzed reach an attempt was done to determinate dominant discharge.
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