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| Titel |
Spatial controls on groundwater response dynamics in a snowmelt-dominated montane catchment |
| VerfasserIn |
R. S. Smith, R. D. Moore, M. Weiler, G. Jost |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 5 ; Nr. 18, no. 5 (2014-05-21), S.1835-1856 |
| Datensatznummer |
250120361
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| Publikation (Nr.) |
 copernicus.org/hess-18-1835-2014.pdf |
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| Zusammenfassung |
| The role of spatial variability in water inputs on runoff dynamics has
generally not received as much research attention as topography and soils;
however, the influence of topography and forest cover on snow surface energy
exchanges can result in asynchronous snowmelt throughout a catchment,
complicating the space–time patterns of runoff generation. This study
investigates temporal variation in the relative importance of spatial
controls on the occurrence, duration, and timing of shallow groundwater
response, utilizing a highly distributed monitoring network in a
snowmelt-dominated montane catchment in western Canada. The study findings
indicate that deep-soil hydraulic conductivity is a first-order control on
the spatial distribution of sites that generate shallow groundwater response
versus sites that experience only deep percolation. Upslope contributing area
and slope gradient are first-order controls on the duration of groundwater
response during peak-flow, recession-flow, and low-flow periods. Shallow
runoff response areas expand and contract throughout these periods and follow
the general spatial patterns of topographic convergence. However, spatial
controls on the timing, intensity, and quantity of snowmelt and controls on
vertical versus lateral flux partitioning in the soil overwhelm the influence
of topographic convergence on runoff patterns during early spring freshet
periods. The study findings suggest that various topographic indices and
topography-based rainfall runoff models would not likely be good predictors
of runoff patterns in snowmelt-dominated montane catchments during early
phases of the spring freshet, but would increase in importance as the freshet
and post-freshet periods proceed. |
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