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Wyświetlanie 1-4 z 4
Tytuł:
Dynamika odpływu ze zlodowaconej zlewni Rzeki Waldemara (NW Spitsbergen) w sezonach letnich 2009-2011
Dynamics of the outflow from the glacierized Waldemar River catchment (NW Spitsbergen) in summer season 2009-2011
Autorzy:
Sobota, I.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/260991.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
rzeka lodowcowa
odpływ
zlewnia zlodowacona
zmienność odpływu
glacial river
runoff
glacial catchment
runoff changes
Opis:
Jednym z ważnych zagadnień hydrologii obszarów zlodowaconych jest ustrój rzek proglacjalnych, rozumiany jako charakter zmienności ich odpływu w czasie. W pracy przedstawiono wyniki badań odpływu ze zlewni Rzeki Waldemara przeprowadzonych w sezonach letnich 2009, 2010 i 2011. Były one kontynuacją badań odpływu ze zlewni Lodowca Waldemara prowadzonych w sezonach letnich od 1977 oraz nieprzerwanie od 1996 roku. Dokonano analizy jego zmienności w oparciu o wybrane skale czasowe. Wybrane elementy odpływu odniesiono do przebiegu warunków meteorologicznych. W okresie objętym analizą wystąpiły znaczące różnice w charakterystyce odpływu Rzeką Waldemara. Średni przepływ w sezonach letnich 2009, 2010 i 2011 wyniósł odpowiednio: 0,84 m3s-1, 0,55 m3s-1 oraz 1,01 m3s-1. Rzeka Waldemara w różnych skalach czasowych charakteryzuje się specyficznymi warunkami odpływu, które kształtowane są przede wszystkim warunkami pogodowymi wpływającymi na intensywność ablacji lodowcowej, jak również warunkami śniegowymi na lodowcu. Istotną rolę w reżimie rzeki odgrywają zdarzenia niecykliczne, do których należą zjawiska fenowe oraz udrożnienie systemu drenażu lodowca.
This paper presents the results of the research of runoff from the basin of the Waldemar Glacier conducted in summer seasons 2009, 2010 and 2011. The catchment area is about 5 km2, 50% out of which is covered by glacier. The main measurements point was located in the area of the leakage of the river onto the outwash plain. These investigations were a continuation of runoff research from the catchment conducted from the summer seasons of 1977 and continuously since 1996. An analysis of runoff changeability based on selected time scales was performed. Selected elements of the runoff were related to meteorological conditions. In the period under study there were significant differences in the characteristics of the outflow of Waldemar River runoff. The average discharge for the summer seasons 2009, 2010 and 2011 was 0.84 młs-1, 0.55 młs-1 and 1.01 młs-1 respectively. The Waldemar River at different time scales is characterized by specific conditions of the runoff, which are shaped primarily by weather conditions, the intensity of glacier ablation, and snow conditions on the glacier. Important role in the regime of the river plays a non-cyclical phenomenon, like a fohn, or sudden unblocking in- and/or subglacial drainage system.
Źródło:
Problemy Klimatologii Polarnej; 2012, 22; 57-68
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluvial response to environmental changes during MIS 4-3: a sedimentary record at the Brześnica site, central-western Poland
Autorzy:
Moskalewicz, Damian
Tylmann, Karol
Woźniak, Piotr Paweł
Kopyść, Natalia
Moska, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2060131.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
braided river
fluvial deposits
OSL dating
MIS 4
MIS 3
Last Glacial Maximum
Opis:
Fluvial deposits subjected to this study are exposed at the Brześnica site, in the south-western part of the Wielkopolska region in Poland, which was close to the ice-sheet limit during the Last Glacial Maximum (LGM). Sedimentological analyses, including lithofacies descriptions, palaeocurrent measurements, grain size and rounding analyses and heavy mineral compositions indicate that the fluvial deposits at Brześnica were deposited in braided river environment. The following fluvial sedimentary processes were inferred: (1) shallow, rapid flow alternating with waning flow, (2) infilling of erosional channels with fluvial sediments during flood events, (3) changes from supercritical to subcritical flows, and (4) shallow sheet floods. The results of OSL dating indicated sediment deposition ~65.2 ±1.5 ka, i.e. in MIS 4, that was here characterized by cold environmental conditions and a general shift from meandering to braided fluvial sedimentation style. This finding contrasts with accumulation/erosion phases interpreted previously in this region for that time interval; however, it is consistent with recent studies of fluvial systems functioning during MIS 5-2 and of factors responsible for sedimentation style.
Źródło:
Geological Quarterly; 2020, 64, 4; 915--930
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osada ludności kultury łużyckiej w Deszcznie, pow. Gorzów Wielkopolski
The settlement of the Lusatian culture in Deszczno, Gorzów Wielkopolski district
Autorzy:
Kozłowska, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/440800.pdf
Data publikacji:
2013
Wydawca:
Muzeum Narodowe w Szczecinie
Tematy:
grupa górzycka
kultura łużycka
osada
Pradolina Noteci
strefa kontaktowa
Górzycka group
Lusatian culture
settlement
Noteć River glacial valley
contact zone
Opis:
Materials presented in this article are the result of two seasons of excavations. At the outset, it is worth noting that the location of the settlement in Deszczno, in the so-called contact zone, makes it interesting from a sources aspect and from a ‘Pomeranian perspective.’ The site 11/13 in Deszczno belongs to the open settlement type. All features recorded there were below ground ones. Amongst them pits of unrecognized function (118) and postholes (70) dominate. Furthermore, 65 oval and circular pits, rectangular or trapezoidal in section were recorded, which hypothetically are the remains of cellars or proper storage pits. Hearths occurred in the settlement in question only rarely. Despite excavating a large area of the settlement its spatial organization is not clear. Unfortunately, the poor state of the features’ preservation does not allow for a more detailed interpretation of their functions. Remains of probable dwellings, which are one of basic elements in distinguishing hypothetical farms’ boundaries, were recorded occasionally. It can be assumed that large, irregular features are only the sunken parts of larger overground buildings. Unfortunately, it was impossible to find any evident remains of this type of construction linked with dwellings. It is also difficult to perceive a division of space into separate zones, such as residential and agricultural or production and agricultural ones. Production and agricultural features were scattered within the entire excavated area. Numerous and chronologically diverse materials discovered on the site indicate the long-term use of the place, at least from the late Bronze Age to the Middle Ages. The settlement in question, related to communities of the Lusatian culture, was present here as early as from period IV of the Bronze Age. This is indicated by infrequent but evident elements of the Uradz style of pottery decoration. Its small number on the site seems to match the general trend in the occurrence of this type of pottery in Greater Poland and the Lubusz Land region. According to M. Kaczmarek, it may indicate that the phenomenon of the Uradz style was of slightly shorter duration than was assumed and covered only a part of period IV of the Bronze Age. Perceptible settlement activity occurred on the site during the next stage dated to the turn of period V of the Bronze Age and Early Iron Age. This period also marks the beginning of phenomena associated with the development of settlement of the Górzycka group of the Lusatian culture encompassing areas on both sides of the lower Warta and Noteć River basins as well as the middle and lower Odra River. The increased activity of this group in the aforementioned zone is confirmed by discoveries of numerous sites.
Źródło:
Materiały Zachodniopomorskie; 2012, 9; 51-100
0076-5236
Pojawia się w:
Materiały Zachodniopomorskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating long term sediment yields from sediment core analysis
Oszacowanie dlugookresowej dostawy rumowiska na podstawie analizy rdzeniowej
Autorzy:
Kennie, P
Bogen, J.
Olsen, H.C.
Powiązania:
https://bibliotekanauki.pl/articles/81703.pdf
Data publikacji:
2010
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
sediment yield
core analysis
glacial river
sediment transport
Lake Nigardsvatn
Norway
Opis:
Sediment cores from lakes and reservoirs can be used to estimate sediment yields. In proglacial lakes, the bed sediment typically accumulates as varves, reflecting changes in seasonal and annual sedimentation. This report compares the results from two different methods of measuring suspended sediment transport in a Norwegian glacial river and lake. Sediment yields obtained from a study of sediment cores in the proglacial lake Nigardsvatn along with measurements of the delta topset were compared with a 25-year record of sediment transport based on automatic water sampling and water discharge measurements at a monitoring station at the inflowing river. During the period from 1980 to 2005, analyses of sediment cores taken from the lake bed along with measurements and grain size distribution analysis of the delta indicated that a volume of 175,670 to 202,697 m3 was deposited in the lake Nigardsvatn and corresponding river delta. The year 1980 was selected as a convenient starting point because a large-magnitude flood with a 100-year recurrence interval occurred at the end of 1979, leaving an easily recognizable sediment layer and accurate reference point. Sediment cores were taken at a total of 24 locations throughout the lake and 25 locations in the delta. The densities of the sediment cores were found to vary between 1.3 and 1.5 g/cm3 during the period examined in this study, giving a total suspended sediment load of between 175,670 and 202,697 tons. The measurements carried out at the sediment station in the glacier melt-water river gave a value of 294,800 tons during the same period. A final value of 211,100 tons is calculated from the monitoring station results after deduction of the sediment fraction which passes through the lake without being deposited. This gives a discrepancy between the two methods of 8,403 to 35,430 tons (4–20%). This can be partially attributed to the difficulties of measuring the water discharge in the unstable glacier meltwater river. In conclusion, sediment cores may be used to extrapolate or correct measurements from sediment monitoring stations over longer periods but caution should be made when considering single years.
W pracy przedstawiono wyniki badań prowadzonych według dwóch różnych metod pomiaru ilości rumowiska unoszonego, dostarczonego w latach 1980–2005 do jeziora Nigardsvatn w Norwegii, które zasilane jest wodami roztopowymi z lodowca Jostedalsbreen. Wielkość dostawy rumowiska, określoną na podstawie analizy rdzeniowej z sondowania geologicznego osadów dennych jeziora, porównano z wynikami uzyskanymi na podstawie danych z 25-cio letniego ciągu pomiarów zmącenia w rzece zasilającej jezioro. Stwierdzono, że różnica w wielkości dostawy rumowiska do jeziora określona dwiema metodami wynosi 4–20%, przy czym mniejsze wartości uzyskano na podstawie analizy rdzeniowej osadów. Autorzy uważają, że metoda ta może być stosowana do oszacowania lub korygowania wyników pomiarów zmącenia w rzekach zasilających jeziora i zbiorniki wodne w dostatecznie długich okresach.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2010, 42, 1; 115-126
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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