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Titolo:
HYDROLOGICAL AND HYDROCHEMICAL RESPONSE OF A SMALL CANADIAN SHIELD CATCHMENT TO LATE WINTER RAIN-ON-SNOW EVENTS
Autore:
MCLEAN RA; ENGLISH MC; SCHIFF SL;
Indirizzi:
WILFRID LAURIER UNIV,COLD REGIONS RES CTR WATERLOO ON N2L 3C5 CANADA
Titolo Testata:
Hydrological processes
fascicolo: 8, volume: 9, anno: 1995,
pagine: 845 - 863
SICI:
0885-6087(1995)9:8<845:HAHROA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIME-DOMAIN REFLECTOMETRY; SOUTH-CENTRAL ONTARIO; WATER-TABLE RESPONSE; PRECAMBRIAN SHIELD; ELECTROMAGNETIC DETERMINATION; STREAMFLOW GENERATION; CAPILLARY-FRINGE; ACIDIFICATION; DEPOSITION; MELTWATER;
Keywords:
RAIN-ON-SNOW; SNOWMELT; GROUNDWATER; FORESTED CATCHMENTS; STREAM FLOW; PREFERENTIAL ELUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
R.A. Mclean et al., "HYDROLOGICAL AND HYDROCHEMICAL RESPONSE OF A SMALL CANADIAN SHIELD CATCHMENT TO LATE WINTER RAIN-ON-SNOW EVENTS", Hydrological processes, 9(8), 1995, pp. 845-863

Abstract

A study was undertaken during the winter of 1990-1991 in a small (3.7ha) Canadian Shield catchment to examine the hydrological and hydrochemical response during rain-on-snow events. The results are presented of two large (37.9 and 34.6 mm) rain-on-snow events occurring in earlyand late March 1991. Peak and total runoff and the groundwater response from the two events are significantly different. Hydrological data indicate that these differences can be attributed to a combination of meteorological (temperature) and physical conditions (antecedent snowpack ripeness, soil moisture and groundwater levels). An immature snowpack (low temperature and density) combined with low antecedent soil moisture conditions significantly reduced the magnitude of the net hydrological input and runoff from the catchment during the early March event, whereas a more mature snowpack and high antecedent soil moisture conditions led to a large runoff event during late March. During both rain-on-snow events a significant portion of the pre-event snowpack chemical load was lost. Based on the maximum snowpack chemical load measured before the events, the two large rain-on-snow events and a brief mid-March warm period during which there were two much smaller rain-on-snow events removed 78% of the hydrogen ion and 63% of the sulphate and nitrate load from the snowpack, while only reducing snowpack water equivalence by 7%. A two-component (rain and snowmelt) isotopic (delta(18)O SMOW parts per thousand) separation of snowmelt lysimeter water during the two events indicated that snowmelt was an important (50 and 65%, respectively) water source available for infiltration and runoff at the snow-soil interface. Considering the high hydrogen ion loadingsto the catchment during these two events (3.3 and 3.0 mequiv. m(-2), respectively) streamflow pH was not significantly reduced due to an increase in the discharge of well-buffered groundwater. A two-component isotopic hydrograph separation of peak stream discharge during the 2-3March event indicated that 75% of the total flow was groundwater. In mid-latitude acid-sensitive catchments, winter rain-on-snow events arean important hydrological occurrence due to their ability to elute much of the chemical load (H+, SO4, NO3) from the snowpack before the onset of spring melt when the maximum annual hydrological input typically occurs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 09:55:02