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@article{1389191,
author = {Nehyba, Slavomír and Hanáček, Martin and Engel, Zbyněk and Stachoň, Zdeněk},
article_location = {Amsterdam},
article_number = {October},
doi = {http://dx.doi.org/10.1016/j.geomorph.2017.08.019},
keywords = {Svalbard; Nordenskioldbreen; Gilbert delta; Stacking pattern; Glacier dam retreat; Basin floor morphology; Fluvio-deltaic terraces},
language = {eng},
issn = {0169-555X},
journal = {Geomorphology},
title = {Rise and fall of a small ice-dammed lake - role of deglaciation processes and morphology},
volume = {295},
year = {2017}
}
TY - JOUR
ID - 1389191
AU - Nehyba, Slavomír - Hanáček, Martin - Engel, Zbyněk - Stachoň, Zdeněk
PY - 2017
TI - Rise and fall of a small ice-dammed lake - role of deglaciation processes and morphology
JF - Geomorphology
VL - 295
IS - October
SP - 662-679
EP - 662-679
PB - Elsevier Science
SN - 0169555X
KW - Svalbard
KW - Nordenskioldbreen
KW - Gilbert delta
KW - Stacking pattern
KW - Glacier dam retreat
KW - Basin floor morphology
KW - Fluvio-deltaic terraces
N2 - A small ice-dammed lake, which developed along the margin of Nordenskiöldbreen on the northern coast of Adolfbukta, (central Spitsbergen, Svalbard) has been studied by a combination of facies analysis, ground penetrating radar, analysis of photos and satellite imagery, and by surface mapping by Unmanned Aerial Vehicle (drone). The lake existed between the years 1990–2012 and occupied two partial depressions in the bedrock, separated by a bedrock ridge for the dominant period of its history. Whereas the eastern depression was almost completely infilled due to direct fluvial input, the western depression revealed only thin sedimentary cover and was dotted from the eastern depression by an outflow of surficial waters. Gilbert delta deposits with typical tripartite zones of topset, foreset and bottomset were recognised in the eastern depression. Topset was comprised by deposits of a braided river. Foreset is formed by deposits of sediment gravity flows (turbidity currents and debris flows). Bottomset is represented by alternating suspension deposits and deposits of hyperpycnal underflows (low-density turbidity currents). The ruling factors of the evolution of the delta were glacier retreat, bedrock morphology, both affecting the relative lake level, and the rate of sediment delivery. Glacier retreat over stepped and inclined bedrock morphology led to delta prograding and downstepping. The recognised fluvio-deltaic terraces revealed four lake level falls followed by fluvial downcutting, erosion and redeposition of the older deltaic/lake deposits, the shifting of the lake´s position towards the damming glacier and the transition of the sediment input in the same direction. The termination of the lake was a result of further glacier retreat and the opening of subglacial drainage.
ER -
NEHYBA, Slavomír, Martin HANÁČEK, Zbyněk ENGEL a Zdeněk STACHOŇ. Rise and fall of a small ice-dammed lake - role of deglaciation processes and morphology. \textit{Geomorphology}. Amsterdam: Elsevier Science, roč.~295, October, s.~662-679. ISSN~0169-555X. doi:10.1016/j.geomorph.2017.08.019. 2017.
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