gravel-bed streems;particle size analyses;change of channel pattern;human impact;Western Carpathians

The paper summarizes existing knowledge of factors of morphodynamic changes in channels and alluvia of Carpathian streams. The study focuses on particle size analysis by the photogrammetrical equipment and the statistical evaluation of sediment changes in gravel beds. The transformation of streams is presented on the example of several typical gravel carrying streams in the area of the Czech Carpathians ? Kopytná, Morávka, Tyra and Mohelnice Rivers and their tributaries (with typical "step and pool" and "pool and riffle" patterns).

The paper summarizes existing knowledge of factors of morphodynamic changes in channels and alluvia of Carpathian streams. The study focuses on particle size analysis by the photogrammetrical equipment and the statistical evaluation of sediment changes in gravel beds. The transformation of streams is presented on the example of several typical gravel carrying streams in the area of the Czech Carpathians ? Kopytná, Morávka, Tyra and Mohelnice Rivers and their tributaries (with typical "step and pool" and "pool and riffle" patterns).