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Titolo:
Effect of drought on hydrology and sulphate dynamics in a temperate swamp
Autore:
Warren, FJ; Waddington, JM; Bourbonniere, RA; Day, SM;
Indirizzi:
McMaster Univ, Sch Geog & Geol, Hamilton, ON L8S 4K1, Canada McMaster Univ Hamilton ON Canada L8S 4K1 ol, Hamilton, ON L8S 4K1, Canada Environm Canada, Natl Water Res Inst, Burlington, ON L7R 4A6, Canada Environm Canada Burlington ON Canada L7R 4A6 rlington, ON L7R 4A6, Canada
Titolo Testata:
HYDROLOGICAL PROCESSES
fascicolo: 16, volume: 15, anno: 2001,
pagine: 3133 - 3150
SICI:
0885-6087(200111)15:16<3133:EODOHA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECAMBRIAN SHIELD WETLANDS; SURFACE-WATER INTERACTIONS; BIG RUN BOG; WEST-VIRGINIA; NITROGEN TRANSFORMATIONS; CANADIAN SHIELD; SULFATE; STREAM; GROUNDWATER; RETENTION;
Keywords:
wetland; groundwater; sulphate; mass balance; drought; runoff;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Waddington, JM McMaster Univ, Sch Geog & Geol, Hamilton, ON L8S 4K1, Canada McMaster Univ Hamilton ON Canada L8S 4K1 N L8S 4K1, Canada
Citazione:
F.J. Warren et al., "Effect of drought on hydrology and sulphate dynamics in a temperate swamp", HYDROL PROC, 15(16), 2001, pp. 3133-3150

Abstract

Temperate wetlands are generally net retainers of sulphate (SO4-2). However, recent research indicates that some wetlands may export SO4-2 during drought conditions. In temperate wetlands, the susceptibility to drought will depend on wetland-stream and groundwater-surface water interactions. Here we present results of summer SO4-2 dynamics in a confined and unconfined stream within a temperate swamp. At the confined transect, the water table levels dropped greatly (-55 cm) and groundwater flow patterns reversed in response to summer drought. Although high porewater SO4-2 concentrations (36.4 mg l(-1)) were measured, no downstream export of SO4-2 was observed. A SO4-2 mass balance analysis on this stream reach indicated near zero retention. At the unconfined transect, water flowed from the stream to the wetland throughout most of the summer, maintaining relatively high water table levels (-25 cm). Sulphate porewaterconcentrations were significantly lower (9-2 mg l(-1)) than in the confined transect. Downstream discharge decreased to zero within this reach duringextreme drought conditions, resulting in 100% SO4-2 retention for a three-week period. Upon rewetting stream SO4-2 levels increased to 161.7 mg l(-1)resulting in a large net export Of SO4-2. This study demonstrates that while water table position was an important control on SO4-2 dynamics within the wetland, the degree of hydrologic connectivity between the wetland and the stream was the main control on episodic SO4-2 release following summer drought. Copyright (C) 2001 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 07:28:09