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Titolo:
RUNOFF GENERATION IN ZERO-ORDER PRECAMBRIAN SHIELD CATCHMENTS - THE STORMFLOW RESPONSE OF A HETEROGENEOUS LANDSCAPE
Autore:
ALLAN CJ; ROULET NT;
Indirizzi:
UNIV N CAROLINA,DEPT GEOG & EARTH SCI CHARLOTTE NC 28223
Titolo Testata:
Hydrological processes
fascicolo: 4, volume: 8, anno: 1994,
pagine: 369 - 388
SICI:
0885-6087(1994)8:4<369:RGIZPS>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Keywords:
RUNOFF PRODUCTION; PRECAMBRIAN SHIELD CATCHMENTS; CONTRIBUTING AREAS; OVERLAND FLOW; SUBSURFACE STORMFLOW; STABLE ISOTOPES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
C.J. Allan e N.T. Roulet, "RUNOFF GENERATION IN ZERO-ORDER PRECAMBRIAN SHIELD CATCHMENTS - THE STORMFLOW RESPONSE OF A HETEROGENEOUS LANDSCAPE", Hydrological processes, 8(4), 1994, pp. 369-388

Abstract

Hydrometric and isotopic (oxygen-18) observations were used to delineate the runoff processes operating in several headwater catchments on the Precambrian Shield of Canada. The catchments comprise patches of conifer forest situated on thin soils among areas of lichen-covered granitic bedrock. Horton overland flow occurred from the lichen-bedrock areas in all precipitation events that exceeded 4- 6 mm. Runoff from the forest stands occurred mainly as subsurface stormflow, but in some instances saturation overland flow was observed. The occurrence of saturation overland flow was controlled by the topography of the bedrock beneath the forest soils. The area contributing runoff and the pathway by which water was conveyed to the catchment outflow switched from theopen lichen-bedrock areas producing overland flow on the rising limb of the storm hydrograph to the forest stands contributing subsurface stormflow on the recession limb of the hydrograph. The areal extent andposition of the landscape units in the basin were important to the rate and magnitude of stormflow production. Runoff was generated from the catchments only during and immediately after snowmelt and/or rainfall events. The catchments were dry and/or frozen for about 70% of the year.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 09:48:58