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Changing trends of river fows in the Upper Vistula Basin (East Central Europe)

100%

Górnik M.

Acta Geophysica

2020

tom Vol. 68, no. 2

495--504

The mean annual, winter half-year and summer half-year fows at 86 water level gauges in the Upper Vistula Basin in the years 1951–2015 were examined. The Ward’s hierarchical cluster analysis was used for grouping sub-catchments in reference to the standardized aforementioned fows. Trends analysis was performed for each cluster of catchments in all combinations of periods not shorter than 20 years. Spatial distribution of clusters of catchments has been analysed according to geographical locations. There are observed diferent trends in distinguished groups of catchments, wherein the substantial diferences concern long-term trends. Changes in trend direction in the years 1951–2015 were revealed, which indicate fow fuctuations. Presumably, physiographical heterogeneity of the Upper Vistula Basin is refected in no unequivocal trends occurring in clusters of catchments. Some similarities were stated in short-term trends occurring in particular groups of catchments.

Aktywność neotektoniczna Pasma Lubania (Gorce) na podstawie analizy parametrów morfometrycznych

63%

Buczek K. , Górnik M.

Przegląd Geologiczny

2019

tom Vol. 67, nr 4

270--278

The aim of this paper is to use a relative tectonic index (Iat) in order to evaluate tectonic activity in the intermediate mountain area of the Lubań Range. To estimate the tectonic activity in the study area, we analyzed 6 DEM derived geomorphic indices for 66 basins: the stream-gradient index (SL), asymmetry factor (Af), basin shape ratio (Bs), hypsometric integral (Hi), valley floor width-valley height ratio (Vf) and mountain-front sinuosity (Smf). These parameters were combined to obtain the relative tectonic activity index (Iat). According to Iat values, ca. 25% of the Lubań Range was classified as areas of relatively high tectonic activity and ca. 72% as moderately tectonically active. The Iat values suggest a higher relative tectonic activity in the western part of the range, since some morphometric indices, like HI and SL, indicate a higher rate of tectonic uplift along the Dunajec Fault and normalfaults on the northern slopes of the Lubań Range. The rate of the tectonic uplift obtained from the Iat values is similar to that derivedfrom river incision. Morphometric analysis as well as field evidence of active tectonics, such as triangularfacets, suggest a high rate of tectonic uplift along the northern margins of the range and probably along the eastern slopes of the Lubań Range. The high relative tectonic activity on the southern slopes in the western part of the Lubań Range is probably related to active subsidence of the Nowy Targ Basin