In situ size distribution of suspended particles in the Fraser River

Authors
Citation
Bg. Krishnappan, In situ size distribution of suspended particles in the Fraser River, J HYDR ENG, 126(8), 2000, pp. 561-569
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF HYDRAULIC ENGINEERING-ASCE
ISSN journal
0733-9429 → ACNP
Volume
126
Issue
8
Year of publication
2000
Pages
561 - 569
Database
ISI
SICI code
0733-9429(200008)126:8<561:ISSDOS>2.0.ZU;2-W
Abstract
Size distributions of suspended sediment particles under low flow condition s in the Fraser River were measured using a submersible laser instrument. B y comparing the in situ size distribution measured using this instrument wi th the size distribution of primary particles (measured by collecting sedim ent samples and analyzing them for size distribution after dispersing the p articles by ultrasonic vibration), it was concluded that suspended sediment particles in the Fraser River downstream of pulp mill effluent outfalls ar e transported as agglomerations of particles (flocs) rather than as individ ual particles. Flocculation of river sediments in estuaries has been invest igated in earlier studies, which show that saltwater intrusion contributes to the flocculation mechanism. Freshwater flocculation, such as the one obs erved in the present study, also has been reported in the literature, and i t is attributed to the presence of organic materials and other contaminants from industrial and sewage treatment plant effluents. This paper describes the details of the submersible laser instrument and its use in the Fraser River, British Columbia, Canada.