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Titolo:
The effect of storage on runoff from a headwater subarctic shield basin
Autore:
Spence, C;
Indirizzi:
Environm Canada, Atmospher & Hydrol Sci Div, Yellowknife, NT X1A 1E2, Canada Environm Canada Yellowknife NT Canada X1A 1E2 owknife, NT X1A 1E2, Canada
Titolo Testata:
ARCTIC
fascicolo: 3, volume: 53, anno: 2000,
pagine: 237 - 247
SICI:
0004-0843(200009)53:3<237:TEOSOR>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECAMBRIAN SHIELD; ENERGY-BALANCE; SHALLOW SOIL; HYDROLOGY; SNOWMELT; GENERATION; PEATLAND; FOREST; WATER; FLOW;
Keywords:
Canadian Shield; Northwest Territories; runoff; snowmelt; water management;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Spence, C Environm Canada, Atmospher & Hydrol Sci Div, Suite 301,5204 50thAve, Yellowknife, NT X1A 1E2, Canada Environm Canada Suite 301,5204 50th Ave Yellowknife NT Canada X1A 1E2
Citazione:
C. Spence, "The effect of storage on runoff from a headwater subarctic shield basin", ARCTIC, 53(3), 2000, pp. 237-247

Abstract

Canadian Shield runoff production processes have been investigated, but research is needed beyond the hillslope scale to determine the influences on the volume and timing of runoff from headwater basins to higher-order streams. Such research will permit an understanding of the magnitude of climate change impacts at the watershed scale, where changes in the hydrologic regime are felt most by water resource users. To this end, water budget terms were measured over different portions of a headwater lake basin north of Yellowknife, Northwest Territories, during the spring snowmelt of 1998 to determine the relative importance of each component as water moved through the basin. Evaporation made up 16% and runoff 70% of the snowmelt from upland areas. Upland pending of water during the melt increased the evaporative loss. Headwater lake storage deficits are very important in the timing and volume of runoff that is transmitted downstream: 53% of basin meltwater went to meeting the storage deficit in the lake so that only 7% of the meltwater was routed out of the basin. These results imply that topology of shield headwater basins, notably the location of lakes and antecedent water levels in lakes, are important in determining the runoff response. As storage deficits in surface waters will cause changes over space in runoff response and timing, it may be inappropriate to consider the snowpack or rainfall volumein isolation when forecasting runoff volume. These results are important for water management and hydrological modeling applications of northern shield basins.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 07:31:04