Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
EXAMINING THE CONTRIBUTIONS OF GLACIAL TILL WATER TO STORM RUNOFF USING 2-COMPONENT AND 3-COMPONENT HYDROGRAPH SEPARATIONS
Autore:
HINTON MJ; SCHIFF SL; ENGLISH MC;
Indirizzi:
UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES WATERLOO N2L 3G1 ONTARIO CANADA WILFRID LAURIER UNIV,DEPT GEOG WATERLOO N2L 3C5 ONTARIO CANADA
Titolo Testata:
Water resources research
fascicolo: 4, volume: 30, anno: 1994,
pagine: 983 - 993
SICI:
0043-1397(1994)30:4<983:ETCOGT>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
STREAMFLOW GENERATION; PRECAMBRIAN SHIELD; CAPILLARY-FRINGE; GROUNDWATER-FLOW; CATCHMENT; MODEL; CHEMISTRY; MELTWATER; DEUTERIUM; O-18;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Hinton et al., "EXAMINING THE CONTRIBUTIONS OF GLACIAL TILL WATER TO STORM RUNOFF USING 2-COMPONENT AND 3-COMPONENT HYDROGRAPH SEPARATIONS", Water resources research, 30(4), 1994, pp. 983-993

Abstract

Two- and three-component hydrograph separations based on O-18 and dissolved silica are used to investigate the contributions of glacial till water to the storm runoff of a headwater stream on the Canadian Shield. Two-component isotopic hydrograph separations based on O-18 indicate that the volume and flux of event water could be accounted for by direct precipitation onto saturated areas. Three-component hydrograph separations distinguish between event water, preevent soil water, and preevent till water. These results show that groundwater flow through coarse-textured glacial tills can make a significant contribution to stream discharge during runoff events (29 and 62% in this study) despitethe lower hydraulic conductivities of the tills compared to the overlying soils. The three-component hydrograph separations also demonstrate that the relative contributions of preevent soil water and preevent till water changed during one runoff event such that the average waterchemistry of the preevent component varied during the event. Two-component hydrograph separations using dissolved silica indicate that seasonal changes in the till water contributions also occur and are related to groundwater levels. Measurements of vertical hydraulic gradients during runoff events indicate that the increase in flow from the tillsto the soils is minimal and cannot account for the large and rapid increase in till water flow into the stream. Till water that has discharged to the soils prior to the event is probably being flushed from thesoils into the stream during events.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 04:46:07