ESTUARY NIDA RIVER – CARTOGRAPHIC AND GEOMORPHOLOGICAL CHANGES - FIRST RESULTS

Abstract

Cartographic data has allowed to state very large changes in the estuary of the Nida, as well as the Vistula riverbed in the last 250 years. They were both natural and anthropogenic changes. The studied section is distinguished from other sections of Nida by the lack of organic sediments within the flood plain. The floodplain probably consists of two different-age cut and fill. The older ones, in the marginal part, build sands with a normal sequence. The younger ones, near the riverbed, build coarser alluvia with an coarseing upward sequence. These differences in the geological structure testify to an increase of fluvial processes dynamic what can be related to anthropopressure in the Nida basin in last centuries.

Keywords

• nida river valley
• nida estuary
• cartographic changes
• geological changes