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Maksymalny czas trwania głębokich niżówek letnich w środkowej Polsce i jego uwarunkowania

100%

Edmund T., Uniwersytet Łódzki W. N. G.

Acta Universitatis Lodziensis. Folia Geographica Physica

2008

vol. 8

Artykuł powstał w wyniku prac badawczych prowadzonych w ramach Projektu Zamawianego MNiI (K091/P04/2004/11).

Maximum duration of extreme summer flows in central Poland was estimated on the base of hydrometric data including twenty four hour flow series from the 1966-1983 period, which were published by IMGW. There were 29 water gauges located in Warta, Pilica and Bzura drainage basins (Fig. l) shortlisted for the analysis. Low flow periods were sectioned basing on a border flow SNQ - a principle was that the period with flows below the borderline had lasted at least 5 days, while low flows followed in succession had to be divided by periods of flows higher than SNQ being minimum 3 days long. Maximum summer flows were at that time very differentiated and their length fluctuated from 10 to 282 days (Fig. 2). According to that some kind of spatial order can be outlined here, the longest low flow periods appeared in Great Poland and Warsaw - Berlin Glacial Valley (Fig. 3). Maximum length of low flow was significantly correlated with the parameters, which illustrated flow recession time, mean time of low flow or extreme time constitution in total low flow and extreme low flow time (Fig. 4, 8). The parameters of maximum length probability distribution were estimated as well. On the base of those calculations was estimated the probability of not achieving the maximum, which was empirically confirmed. Values fluctuated from 90-99.2% usually being about 96% (Fig. 6). The greatest probability of lengthening of maximum low flow periods had Great Poland Rivers (Mogilnica, Wrześnica, Lutynia), while the smallest probability was characteristic for rivers, which origins are in uplands (Warta - Poraj, Pilica - Przedbórz).

Waloryzacja środowiska przyrodniczego wczesnośredniowiecznego grodu w Rękoraju na Wysoczyźnie Piotrkowskiej, Polska Środkowa

72%

Piech W.

Acta Universitatis Lodziensis. Folia Geographica Physica

2017

issue 16

For Early Medieval societies areas with high geo- and biodiversity were most suitable for settlement, whereas preferred landforms included river terraces formed by medium and fine sand. The analysis conducted by the Author resulted in elaboration of the terrain assessment maps, which were derived from a geomorphological map of the area. The environmental valorisation of surroundings of the stronghold at Rękoraj was carried out to identify the most favorable areas for early medieval – type of agriculture.

Dla społeczności wczesnego średniowiecza najdogodniejszymi obszarami do zasiedlania były tereny o dużej geo- i bioróżnorodności, zaś preferowanymi formami geomorfologicznymi były terasy rzeczne zbudowane z piasków średnio- i drobnoziarnistych. Przeprowadzone analizy pozwoliły na wykreślenie map waloryzacji, dla których punktem wyjścia była mapa geomorfologiczna obszaru. Waloryzację środowiska otoczenia grodziska w Rękoraju wykonano w celu wskazania obszarów, które były najkorzystniejsze dla gospodarki wczesnośredniowiecznej w warunkach „agrotechniki lekkiej”.

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2 Acta Universitatis Lodziensis. Folia Geographica Physica

1 2017

1 2008

1 Edmund T.

1 Piech W.

1 Uniwersytet Łódzki W. N. G.

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Maksymalny czas trwania głębokich niżówek letnich w środkowej Polsce i jego uwarunkowania

Waloryzacja środowiska przyrodniczego wczesnośredniowiecznego grodu w Rękoraju na Wysoczyźnie Piotrkowskiej, Polska Środkowa