Zasady interpretacji budowy geologicznej aluwiów dolin "dojrzałych swobodnych" na podstawie odcinka Wisły środkowej

Abstract

PRINCIPLES IN INTERPRETATION OF GEOLOGICAL STRUCTURE OF ALLUVIA IN "FREE, MATURE VALLEYS", WITHIN THE AREA OF THE MID-COURSE OF THE VISTULA RIVER Summary According to the dynamics of river bed processes, whose intensity depends upon climatic changes and indirectly upon human activity in the drainage area, a change may be observed in the lithological development of alluvia and in the relief of river terraces. There exists here a regularity showing that the deforestation of a drainage area is responsible for a wild development of a river bed, and that a close forest cover causes meandering processes. The well expressed lithological features and relief of terraces related to a definite development of a river bed (definite dynamics of river bed processes) allow us to determine the character of sedimentation and the appropriate interpretative scheme of the geological structure of the alluvia. Thus, a determination to what river type may be related the sedimentation of the alluvia in a given valley system, and of what rock types is built the area considered, will be a general task here.