DOI: 10.1016/j.quascirev.2014.11.023
Scopus记录号: 2-s2.0-84918797909
论文题名: Climatic and morphological controls on diachronous postglacial lake and river valley evolution in the area of Last Glaciation, northern Poland
作者: Błaszkiewicz M. ; Piotrowski J.A. ; Brauer A. ; Gierszewski P. ; Kordowski J. ; Kramkowski M. ; Lamparski P. ; Lorenz S. ; Noryśkiewicz A.M. ; Ott F. ; Słowiński M. ; Tyszkowski S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 109 起始页码: 13
结束页码: 27
语种: 英语
英文关键词: Fluvial processes
; Holocene
; Lacustrine processes
; Lateglacial
; River valley evolution
Scopus关键词: Glacial geology
; Glaciers
; Ice
; Lakes
; Melting
; Rivers
; Fluvial process
; Holocenes
; Lateglacial
; Morphological control
; Palynological analysis
; River valley
; Subglacial channels
; Subglacial meltwater
; Landforms
英文摘要: The Wda River valley in northern Poland is a polygenetic valley located in a former subglacial meltwater channel that after ice sheet retreat hosted separate and then interconnected lake basins, subsequently replaced by a river. In one part of the river system an abandoned Lateglacial valley is found. This dry valley is a unique feature in the area located within the limit of the Scandinavian Ice Sheet during the Last Glaciation in the Central European Lowland. We investigated lacustrine and fluvial sediments and landforms in the valley and applied palynological analysis combined with radiocarbon dating to reconstruct the valley evolution from the early period of river inception in the Lateglacial through the formation of lakes during the Pleistocene/Holocene transition up to the establishment of a modern river system in the early Holocene. Three coeval processes were identified: (1) formation of lake basins in the subglacial channel connected by a river, (2) erosion of the river bed between the lakes, and (3) sediment deposition at the mouths of the channels in the lake basins first generating delta fans and eventually filling the lakes entirely. The valley formation was associated with diachronous melting of dead ice blocks buried in the subglacial channel controlled by the capacity of the hydrological system to evacuate the meltwater. Most of the lake basins in the study area were formed during the Bølling-Allerød period, but one section of the subglacial channel not affected by thermokarst processes survived protected by dead ice blocks throughout the entire Lateglacial. Accelerated dead-ice decay at the beginning of the Holocene triggered widespread lowering of the base level, which caused lake disappearance and the formation of the modern river system. The processes reconstructed in the central section of the Wda River indicate a highly dynamic and diachronous river valley development during the Lateglacial and early Holocene whereby the valley formation was interwoven with the formation of lake basins within the valley triggered by melting of dead ice blocks in the substratum. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60041
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geography and Spatial Organization of the Polish Academy of Sciences, Department of Environmental Resources and Geohazards, Poland; Department of Geoscience, Aarhus University, Denmark; Helmholz Centre, German Research Centre for Geosciences GFZ, Department 5.2 Climate Dynamics and Landscape Evolution, Potsdam, Germany; University of Greifswald, Institute of Geography and Geology, Greifswald, Germany; Nicolaus Copernicus University, Toruń, Poland
Recommended Citation:
Błaszkiewicz M.,Piotrowski J.A.,Brauer A.,et al. Climatic and morphological controls on diachronous postglacial lake and river valley evolution in the area of Last Glaciation, northern Poland[J]. Quaternary Science Reviews,2015-01-01,109