DC pole | Wartość | Język |
dc.contributor.author | Decaux, Leo | - |
dc.contributor.author | Grabiec, Mariusz | - |
dc.contributor.author | Ignatiuk, Dariusz | - |
dc.contributor.author | Jania, Jacek | - |
dc.date.accessioned | 2019-03-15T07:26:50Z | - |
dc.date.available | 2019-03-15T07:26:50Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | The Cryosphere, Vol. 13 (2019), s. 735-752 | pl_PL |
dc.identifier.issn | 1994-0424 | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12128/8554 | - |
dc.description.abstract | As the behavior of subglacial water plays a determining
role in glacier dynamics, it requires particular
attention, especially in the context of climate warming,
which is increasing ablation and generating greater amounts
of meltwater. On many glaciers, water flowing from the
glacier’s surface is the main source of supply to the subglacial
drainage system. This system is largely influenced by
the supraglacial drainage system, which collects meltwater
and precipitation and rapidly delivers it to discrete points
in the glacier bed via moulins and crevassed areas, called
water input areas (WIAs). Models of patterns of subglacial
conduits mainly based on the hydrological potential gradient
are still regularly performed without taking into account
the supraglacial drainage system. We modeled the pattern of
subglacial channels in two glaciers located in Svalbard, the
land-terminating Werenskioldbreen and the tidewater Hansbreen
during the 2015 melt season.We modeled a spatial and
a discrete water recharge in order to compare them. First,
supraglacial catchments were determined for each WIA on
a high-resolution digital elevation model using the standard
watershed modeling tool in ArcGIS. Then, interpolated water
runoff was calculated for all the main WIAs. Our model
also accounts for several water pressure conditions. For our
two studied glaciers, during the ablation season 2015, 72.5%
of total runoff was provided by meltwater and 27.5% by
precipitation. Changes in supraglacial drainage on a decadal
timescale are observed in contrast to its nearly stable state
on an annual timescale. Nevertheless, due to the specific nature
of those changes, it seems to have a low impact on the
subglacial system. Therefore, our models of subglacial channel
are assumed to be valid for a minimum period of two
decades and depend on changes in the supraglacial drainage
system. Results showed that, for Svalbard tidewater glaciers
with large crevassed areas, models of subglacial channels
that assume spatial water recharge may be somewhat imprecise
but are far from being completely incorrect, especially
for the ablation zone. On the other hand, it is important to
take discrete water recharge into account in the case of landterminating
Svalbard glaciers with limited crevassed areas. In
all cases, considering a discrete water recharge when modeling
patterns of theoretical subglacial channels seems to produce
more realistic results according to current knowledge. | pl_PL |
dc.language.iso | en | pl_PL |
dc.rights | Uznanie autorstwa 3.0 Polska | * |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/pl/ | * |
dc.subject | glaciers | pl_PL |
dc.subject | discrete water recharge | pl_PL |
dc.subject | Svalbard glaciers | pl_PL |
dc.title | Role of discrete water recharge from supraglacial drainage systems in modeling patterns of subglacial conduits in Svalbard glaciers | pl_PL |
dc.type | info:eu-repo/semantics/article | pl_PL |
dc.identifier.doi | 10.5194/tc-13-735-2019 | - |
Pojawia się w kolekcji: | Artykuły (WNP)
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