Downstream variability of channel morphology and bed material in the braided Keller River, James Ross Island, Antarctica

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00118120" target="_blank" >RIV/00216224:14310/20:00118120 - isvavai.cz</a>

Výsledek na webu

<a href="http://gfdq.glaciologia.it/043_2_01_2020/" target="_blank" >http://gfdq.glaciologia.it/043_2_01_2020/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4461/GFDQ.2020.43.8" target="_blank" >10.4461/GFDQ.2020.43.8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Downstream variability of channel morphology and bed material in the braided Keller River, James Ross Island, Antarctica

Popis výsledku v původním jazyce

Changes in sediment supply and water availability in rivers are associated with ongoing climate change and glacier melting. The processes connected with increasing temperatures largely determine braidplain activity within glacier forefields. This work focuses on downstream changes in channel morphology (i.e., channel width and braiding intensity) and bed material (i.e., petrological types and clast roundness), as well as possible controlling factors (i.e., sediment sources and sediment connectivity). The study area is the Keller River catchment located on the James Ross Island (JRI), Antarctica. This paper describes the 8.6 km-long Keller River in terms of morphology, including river braidplains, sediment sources and connectivity within the catchment. Eight sediment sources and three types were identified: one moraine sediment source, four debris- flow-dominated sediment sources and three fluvial-flow-dominated sediment sources. Along with high sediment connectivity, the occurrence of lateral sediment sources from tributaries significantly impacted downstream changes in channel morphology and processes. Channel width and braiding intensity showed an increasing downstream trend, although the channel width trend was irregular. As for bed material, sediment sources markedly control clast roundness with little effect of petrological properties.

Název v anglickém jazyce

Downstream variability of channel morphology and bed material in the braided Keller River, James Ross Island, Antarctica

Popis výsledku anglicky

Changes in sediment supply and water availability in rivers are associated with ongoing climate change and glacier melting. The processes connected with increasing temperatures largely determine braidplain activity within glacier forefields. This work focuses on downstream changes in channel morphology (i.e., channel width and braiding intensity) and bed material (i.e., petrological types and clast roundness), as well as possible controlling factors (i.e., sediment sources and sediment connectivity). The study area is the Keller River catchment located on the James Ross Island (JRI), Antarctica. This paper describes the 8.6 km-long Keller River in terms of morphology, including river braidplains, sediment sources and connectivity within the catchment. Eight sediment sources and three types were identified: one moraine sediment source, four debris- flow-dominated sediment sources and three fluvial-flow-dominated sediment sources. Along with high sediment connectivity, the occurrence of lateral sediment sources from tributaries significantly impacted downstream changes in channel morphology and processes. Channel width and braiding intensity showed an increasing downstream trend, although the channel width trend was irregular. As for bed material, sediment sources markedly control clast roundness with little effect of petrological properties.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geografia Fisica e Dinamica Quaternaria

ISSN

0391-9838

e-ISSN

—

Svazek periodika

43

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

13

Strana od-do

195-207

Kód UT WoS článku

000645287600001

EID výsledku v databázi Scopus

2-s2.0-85125707167