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Titolo:
Turbidity, suspended sediment, and water clarity: A review
Autore:
Davies-Colley, RJ; Smith, DG;
Indirizzi:
Natl Inst Water & Atmospher Res Ltd, NIWA, Hamilton, New Zealand Natl InstWater & Atmospher Res Ltd Hamilton New Zealand n, New Zealand New York Dept Environm Protect, Bur Water Supply, Valhalla, NY 10595 USA New York Dept Environm Protect Valhalla NY USA 10595 lhalla, NY 10595 USA
Titolo Testata:
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
fascicolo: 5, volume: 37, anno: 2001,
pagine: 1085 - 1101
SICI:
1093-474X(200110)37:5<1085:TSSAWC>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEW-ZEALAND RIVERS; OPTICAL-PROPERTIES; HUMAN PERCEPTION; COLOR; DISK; PENETRATION; SUITABILITY; APPEARANCE; LIGHT; PREY;
Keywords:
clarity; fish habitat; optical properties of water; recreation; Secchi disc; suspended sediment; turbidity; visibility; water quality;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Davies-Colley, RJ Natl Inst Water & Atmospher Res Ltd, NIWA, POB 11-115, Hamilton, New Zealand Natl Inst Water & Atmospher Res Ltd POB 11-115 Hamilton New Zealand
Citazione:
R.J. Davies-Colley e D.G. Smith, "Turbidity, suspended sediment, and water clarity: A review", J AM WAT RE, 37(5), 2001, pp. 1085-1101

Abstract

Suspended sediment causes a range of environmental damage, including benthic smothering, irritation of fish gills, and transport of sorbed contaminants. Much of the impact, while sediment remains suspended, is related to itslight attenuation, which reduces visual range in water and light availability for photosynthesis. Thus measurement of the optical attributes of suspended matter in many instances is more relevant than measurement of its massconcentration. Nephelometric turbidity an index of light scattering by suspended particles, has been widely used as a simple, cheap, instrumental surrogate for suspended sediment, that also relates more directly than mass concentration to optical effects of suspended matter. However, turbidity is only a relative measure of scattering (versus arbitrary standards) that has no intrinsic environmental relevance until calibrated to a 'proper' scientific quantity. Visual clarity (measured as Secchi or black disc visibility) is a preferred optical quantity with immediate environmental relevance to aesthetics, contact recreation, and fish habitat. Contrary to common perception, visual clarity measurement is not particularly subjective and is more precise than turbidity measurement. Black disc visibility is inter-convertible with beam attenuation, a fundamental optical quantity that can be monitored continuously by beam transmissometry Visual clarity or beam attenuation should supplant nephelometric turbidity in many water quality applications, including environmental standards.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 11:33:49