Rise and fall of a small ice-dammed lake - role of deglaciation
processes and morphology

J 2017

Rise and fall of a small ice-dammed lake - role of deglaciation processes and morphology

NEHYBA, Slavomír, Martin HANÁČEK, Zbyněk ENGEL and Zdeněk STACHOŇ

Basic information

Original name

Rise and fall of a small ice-dammed lake - role of deglaciation processes and morphology

Authors

NEHYBA, Slavomír (203 Czech Republic, guarantor, belonging to the institution), Martin HANÁČEK (203 Czech Republic, belonging to the institution), Zbyněk ENGEL (203 Czech Republic) and Zdeněk STACHOŇ (203 Czech Republic, belonging to the institution)

Edition

Geomorphology, Amsterdam, Elsevier Science, 2017, 0169-555X

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10500 1.5. Earth and related environmental sciences

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 3.308

RIV identification code

RIV/00216224:14310/17:00097521

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.geomorph.2017.08.019

UT WoS

000413175000048

Keywords in English

Svalbard; Nordenskioldbreen; Gilbert delta; Stacking pattern; Glacier dam retreat; Basin floor morphology; Fluvio-deltaic terraces

Abstract

V originále

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.

Links

LM2015078, research and development project

Name: Česká polární výzkumná infrastruktura (Acronym: CzechPolar2)

Investor: Ministry of Education, Youth and Sports of the CR

Citovat

NEHYBA, Slavomír, Martin HANÁČEK, Zbyněk ENGEL and Zdeněk STACHOŇ. Rise and fall of a small ice-dammed lake - role of deglaciation processes and morphology. Geomorphology. Amsterdam: Elsevier Science, 2017, vol. 295, October, p. 662-679. ISSN 0169-555X. Available from: https://dx.doi.org/10.1016/j.geomorph.2017.08.019.

@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 and Zdeněk STACHOŇ. Rise and fall of a small ice-dammed lake - role of deglaciation processes and morphology. \textit{Geomorphology}. Amsterdam: Elsevier Science, 2017, vol.~295, October, p.~662-679. ISSN~0169-555X. Available from: https://dx.doi.org/10.1016/j.geomorph.2017.08.019.

Detailed Information on Publication Record