Browsing by Author "Rachlewicz, Grzegorz"
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Item 26 December 2004 tsunami deposits left in areas of various tsunami runup in coastal zone of Thailand(TERRAPUB, 2012-10) Szczuciński, Witold; Rachlewicz, Grzegorz; Chaimanee, Niran; Saisuttichai, Darunee; Tepsuwan, Thawatchai; Lorenc, StanisławThe tsunami deposits left by the 26 December 2004 tsunami in the coastal zone of Thailand were studied within two months of the event and before any significant postdepositional changes could occur. The sediment structure and texture (grain size), as well as its thickness and spatial distribution, were documented for the tsunami deposits in 12 shore-perpendicular transects from areas of various tsunami runup and wave heights. The tsunami deposits were as thick as 0.4 m and were located as far as 1.5 km inland. They were composed mostly of poorly sorted sand and often consisted of one to four normally graded, massive or laminated layers. The deposits generally became finer in the landward direction; however, landward thinning trend of the deposits is not clear, and the maximum accumulation often is not located close to the shoreline but rather is further inland. In comparable coastal environments with similar available sediment sources the tsunami size (represented as the tsunami runup height) is reflected in the resulting deposits. Larger tsunamis are associated with deposits that are thicker, have a maximum accumulation located farther inland, include a finer sediment fraction (likely from deeper offshore areas) and frequently are composed of normally graded layers.Item Jaskinia Lodowa w Ciemniaku (Ice Cave in Ciemniak), Western Tatra, Poland - over a century-long investigations of climate warming-caused degradation of subterranean ice mass(Institute of Geography and Spatial Organization Polish Academy of Sciences, 2023-12) Barabach, Jan; Szczuciński, Witold; Kicińska, Ditta; Palińska, Zuzanna; Rachlewicz, GrzegorzJaskinia Lodowa w Ciemniaku (Ice Cave in Ciemniak), in the Tatra Mountains (Tatry), is believed to host the largest subterranean ice mass in Poland. It has been known for over a century, however, the onset of its scientific investigations dates back to 1922, when Tadeusz and Stefan Zwoliński mapped it. Since then, it has become one of the best-known caves in Poland. It was described in over a hundred scientific and popular science papers. They include findings of international importance, e.g. works related to radioisotopes ,ice-mass balance and age. However, some of the questions asked a century ago are still partly unanswered. One may wonder if they will be delivered before climate warming causes the largest ‘cave glacier’ in Poland to disappear.Item Paraglacial modifications of glacial sediments over millennial to decadal time-scales in the high Arctic (Billefjorden, central Spitsbergen, Svalbard)(Wydział Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza, 2010) Rachlewicz, GrzegorzThe paper discuss the morphologic expression and sedimentological record left after the operation of glacial episodes in the area of Billefjorden, central Spitsbergen, in the period of Late Pleistocene ice-sheet development and in the last advance of glaciers in the Little Ice Age (LIA) around the beginning of the 20th century. No evidence is found for other Holocene glacier advances. Paraglacial activity during several millennia erased the surface expression of Pleistocene glacial deposits, leaving a widespread set of reworked material that adopts features of slope, fluvial, aeolian or littoral environments. Glacial features generated during the past century, and still forming in front of retreating glaciers, undergo intense paraglacial modifications limited to the maximum depth of permafrost thaw during the summer. They deliver vast amounts of erosion-susceptible material from mass movements on buried ice fragments, through the glaciofluvial system to aeolian and littoral activity.Item Zróznicowanie populacji głazów eolizowanych w różnowiekowych strefach peryglacjalnych Polski Zachodniej(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2010) Antczak-Górka, Barbara; Nowaczyk, Bolesław; Bednorz, Ewa; Medyńska-Gulij, Beata; Milecka, Krystyna; Fortuniak, Krzysztof; Chlachula, Jiri; Wrzesiński, Dariusz; Bródka, Sylwia; Mazurek, Małgorzata; Makohonienko, Mirosław; Rachlewicz, Grzegorz; Słowik, Marcin; Piekarczyk, Jan; Borówka, KrzysztofThe article presents the results of statistical analysis performed on various populations of wind-polished boulders in the lowland part of Western Poland. The populations were studied in three zones connected with stages of retreat of the Last Glaciation, both in the foreland and hinterland of each of the zones, to accommodate differences in climatic conditions and genetic types of substratum. Those factors influenced the original population of stones that could then be transformed by the wind. It was found that wind-polished boulders were a common occurrence in the study area, whether lying on the surface or as stone horizons underlying aeolian cover sands. Spatial differences among those populations are due to variations of climatic conditions accompanying the successive stages of retreat of the last inland ice.