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Titolo:
WINTER OXYGEN CONDITIONS IN ICE-COVERED RIVERS - THE IMPACT OF PULP-MILL AND MUNICIPAL EFFLUENTS
Autore:
CHAMBERS PA; SCRIMGEOUR GJ; PIETRONIRO A;
Indirizzi:
NATL HYDROL RES INST,11 INNOVAT BLVD SASKATOON SK S7N 3H5 CANADA CONOR PACIFIC CANADA,ALBURMAC BUSINESS CTR EDMONTON AB T6E 6A8 CANADA
Titolo Testata:
Canadian journal of fisheries and aquatic sciences
fascicolo: 12, volume: 54, anno: 1997,
pagine: 2796 - 2806
SICI:
0706-652X(1997)54:12<2796:WOCIIR>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
2 YUKON RIVERS; WATER-QUALITY; GROWTH; TEMPERATURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
P.A. Chambers et al., "WINTER OXYGEN CONDITIONS IN ICE-COVERED RIVERS - THE IMPACT OF PULP-MILL AND MUNICIPAL EFFLUENTS", Canadian journal of fisheries and aquatic sciences, 54(12), 1997, pp. 2796-2806

Abstract

Depressions in dissolved oxygen (DO) commonly occur in ice-covered rivers and can be further exacerbated by anthropogenic inputs. To assessthe impact of pulp mill and municipal effluents on under-ice oxygen, temporal and spatial patterns in DO were examined for the Athabasca River, Alberta, Canada. Start-up of a bleached kraft mill in 1957 was associated with the lowest late-winter (February-March) DO concentrations ever recorded. Improvements in mill technology since 1977 coincided with increases (P < 0.05) in late-winter DO concentrations at two of three downstream sites and an amelioration in both the magnitude and downstream extent of the DO sag. During recent years (1988-1993), effluent loading resulted in sag and recovery zones over small spatial scales (tens of kilometres) and also contributed to large-scale (hundreds of kilometres) linear declines in DO. A review of oxygen conditions in ice-covered rivers throughout the world likewise showed that DO concentrations decreased linearly with distance below effluent outfalls for most river reaches with effluent concentrations >1%. Our observation that depressions in DO in ice-covered rivers increase with distance downstream raises concerns about safeguarding oxygen levels in northern rivers, especially in view of increasing development in these areas.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/10/20 alle ore 13:42:55