Formy eoliczne doczekały się wielu opracowań, bazujących między innymi na wykorzystaniu technik teledetekcyjnych, które poszerzają możliwości badania dynamiki procesów eolicznych i przekształceń form eolicznych pod wpływem antropopresji. Artykuł prezentuje wyniki badań form eolicznych pod kątem cech morfometrycznych i przekształceń indukowanych działalnością człowieka na obszarze części Polesia Wołyńskiego ograniczonego rzekami Stochod na zachodzie i Horyń na wschodzie. Badania prowadzono przy zastosowaniu analizy mapy topograficznej Wojskowego Instytutu Geograficznego w skali 1:100 000 oraz zdjęć satelitarnych. Na obszarze badań zarejestrowano 187 form eolicznych, z czego 92 noszą ślady współczesnej antropopresji i właśnie ta grupa form podlegała szczegółowej analizie. Wśród nich zidentyfikowano przede wszystkim wydmy paraboliczne, wydmy wałowe i pola piasków eolicznych. Przekształcenia antropogeniczne i uruchamianie deflacji wynikało głównie z rozwoju szlaków drożnych w obrębie form, tworzenia podcięć drogowych, włączenia części form do pól uprawnych, chaotycznej eksploatacji piasku, wykorzystania do celów rekreacyjnych oraz zmiany zalegania poziomu wód gruntowych na skutek melioracji obszarów bagiennych znajdujących się w sąsiedztwie form eolicznych.
EN
There are a lot of results of studies concern on aeolian forms, including analysis based on remote sensing technics, which broaden possibilities of studying the aeolian processes dynamics and transformations of aeolian forms under the influence of anthropopressure. The paper presents results of research focused on morphometry of aeolian forms and recognition of zones transformed by human activity on the part of Volhynia Polesie between Stochod River on the west and Horyń River on the east. Topographic map in scale 1:100 000 published by WIG was used, as well as satellite photographs. On the study area 187 aeolian forms were recognized, including 92, which bear the marks of nowadays transformation. That forms were included into analysis. Among them there were found parabolic dunes, ridge dunes and aeolian sand covers. Anthropogenic transformation and activation of deflation were caused mainly by changing of road trails and roads undercuts, use the aeolian forms for agriculture, chaotic sand exploitation, use for recreational purposes and changing of the ground water level as the result of drainage of boggy areas in vicinity of aeolian forms.
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Results of OSL dating and sedimentary studies from the profile of the low alluvial terrace of the middle Warta River are presented. The samples were dated using the single-aliquot regenera-tive method. Dating was used to establish a timing of the Weichselian Late Glacial events in the river valley environment. Stable conditions on the floodplain are expressed by the deposition of organic-rich series radiocarbon dated at 12 900-12 600 cal BP and 11 600-10 770 cal BP. Samples for OSL dating were collected from the mineral material deposited during the intensification of flood events during the Weichselian decline. The results obtained for the alluvia range from 12.78 ± 0.62 ka b2k to 14.33 ± 0.74 ka b2k. Sedimentological criteria allowed to distinguish between particular flood events. Overestimation of OSL ages is probably a result of rapidity of environmental changes in that time.
At the Koźmin Las site, in Central Poland, in the middle section of the Warta River valley, a series of well-preserved tree trunks and in situ stumps, as well as organic deposits, have been found. The tree remains are dated back to the period between 13,000–12,600 cal BP, i.e. to the Alleröd/Younger Dryas transition. The forest consisted predominantly of pines (Pinus sylvestris L.) of a maximum age of approx. 140 years and an average age of 68 years, and the river valley floor was overgrown. The forest was destroyed ca. 12,600 cal BP by deteriorating hydrological conditions or a sudden catastrophic event. The aim of the study was to assess the degree of degradation in terms of selected macroscopic, physical and chemical properties of a subfossil pine log. On this basis, a conservation process was developed, using aqueous solutions of polyethylene glycols (PEG) with varying concentrations of low- and high-molecular polymers. Treated and dried samples were compared in terms of their tangential and radial dimensional stability, as well as their hygroscopic properties.
The investigated area is located in the middle section of the Warta River valley, where the Neogen deposits with lignite series occur within the Adamów tectonic graben. In the Kozmin-North excavation, opened for extraction in 2008 and belonging to the "Adamów"Lignite Mine, the Neogene deposits are covered with an about 30-m thick Quaternary series. The research was carried out to identify the origin and age of the Quaternary sediments. As a result, four sandy series and three till series were identified, which were deposited during the South Polish Glaciations and Middle Polish Glaciations. North Polish Glaciations sediments developed in extraglacial conditions.
An investigated area is located in the middle reach of the WartaRiver valley. During drillings in the Bór site organic deposits such as detritous calcareous gyttja and calcareous detritous gyttja has been documented in a depth between 14,9 and 16,6 m. The organic deposits are covered by mineral, mostly sandy deposits. The accumulation took place in the small lake formed as an abandoned channel. Palynological analysis led to conclusion that biogenic accumulation began at the end of Wartanian and took place at least to the Eemian Interglacial optimum. Results of palynological, Cladocera and geochemical analysis inform about water level changes and increasing of trophy status of the reservoir. Presence of Mesozoic substratum very close to the palaeolake bottom influenced significantly chemical features of the organic deposits. As Eemian organic deposits are uncommon in the Warta River valley, the Bór site seems important for palaeogeographical reconstructions of the Warta River valley during Eemian Interglacial.