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GLIN==> SEMINAR - TUESDAY, JULY 22 - ANN ARBOR



Title:
NOAA GREAT LAKES SEMINAR SERIES
http://www.glerl.noaa.gov/news/seminars/


Date:
Tuesday, July 22, 2003

Title:
"Analyses of Floc Characteristics and Suspended Particle Behavior"

Speaker:
Rajat K. Chakraborti
Ph.D. Candidate
Department of Civil, Structural, and Environmental Engineering
State University of New York at Buffalo, Buffalo, New York


Time:
10:30 a.m.

Where:
GLERL Main Conference Room
2205 Commonwealth Blvd.
Ann Arbor, MI 48105
For directions:
http://www.glerl.noaa.gov/facil/triptik.html

Abstract:
In order to understand the transport and deposition of suspended particles, experiments were performed to evaluate the particle behavior under different physico-chemical conditions. Particle size distributions and aggregate geometrical information at different mixing times were obtained using a non-intrusive image analysis technique. The time-varying measurements of floc size and structure were used to determine collision efficiency and floc formation. Changes in aggregate morphology with changes of aggregate properties were evaluated using a fractal approach. The results showed that the floc density decreases and floc porosity increases as floc size increases. A fractal-based aggregate growth model was developed and tested with the measurements. Multi-exposure camera images were used to measure the settling rate of suspended particulate matter and to investigate the orientation of suspended particles during settling. It was found that particle structure and encased and pore volume play a significant role in floc formation and the settling behavior of aggregates. Information on suspended particle size and structure in addition to the solids concentration are important in the control and fate of nutrients and pollutants.

For more information, contact:
Dr. Nathan Hawley (NOAA/GLERL)
734-741-2273
Nathan.Hawley@noaa.gov







-- 
David F. Reid, Ph.D.
U.S. Department of Commerce
National Oceanic and Atmospheric Administration
Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.
Ann Arbor, MI  48105-2945
Voice:	734-741-2019
FAX:	743-741-2055
GLERL home page:
   http://www.glerl.noaa.gov