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A. Łajczak

after generał regulation works were initiated on the Vistula channel. The solution of this problem can be approached by measuring the rates of vertical change of mean channel level (downcutting, aggradation) and the mean thickness of overbank deposition which have occurred at successive gauging stations on the Vistula sińce the start of generał regulation works on the river channel (Fig. 8).

Fig. 8. Mean thickness of overbank sedimentation (M.B.A.), represented by mean rates of inter-groyne basin filling-up and levee growth, which have occurred along the whole course

of the Vistula sińce the beginning of regulation works on the river channel

(after Łajczak 1995 a).

The data are presented on the background of the vertical channel level changes (CH.L.CH.)

occurred in the same time

a — mouths of larger Carpathian tributaries, b — mouths of larger upland and lowland tributaries,

c — location of gauging stations on the Vistula with river cross-section levelling, d — stretch of the Vistula between Skoczów and Puławy gauging stations

The Upper Vistula is typified by high rates of channel downcutting. Materiał originating from the channel deepening (and also that contributed by the Carpathian tributaries) is partly deposited within the Middle Yistula