planation surface, fluvial system, Šumava Mts.

Fluvial landforms and deposits provide an opportunity to describe the interaction between alluvial archives and variables of the fluvial system.In order to reconstruct the landscape development, we surveyed well-preserved fluvial archives in the basin of the Roklanský Potok stream. to reach this aim, we use geochronological, geoarchaeological, geophysical, sedimentological and geomorphological analyses. Study area is situated at lifted relict of the Paleogene planation surface in the Šumava Mountains. In accordance with results, we revealed four evolution stages of the fluvial system development during Late Pleistocene and Holocene. The fill level of the higher stream terrace is the remnant of the first evolution stage. Results of the sedimentology indicates that the braided stream filled the vide valley. This aggradation could be linked with the abrupt climate change at the Pleistocene ? Holocene transition. Reconstruction of the second phase suggests intensive incision during the Holocene climatic optimum, caused by high water discharge and efficient soil protection. The overbank sedimentation prevailed on the lower terrace level during the third stage that occurred during the late Subatlantic. We assume allogenic change of the sediment budget caused by colonization of the upper parts of the Šumava Mountains as well as windstorms and bark beetle gradation. Present-day anthropogenic impact, namely channel modification and drainage of the mires, probably intensifies the stream incision during ongoing fourth stage.This reconstruction of the alluvial infill in the flat, rigid area provides insight into development of the sensitive and dynamic part of the nature since the Last Glacial.