Size Distributions and Light Scattering Features of Minerogenic Particles in a Stream during Runoff Events
Publication: Journal of Environmental Engineering
Volume 133, Issue 9
Abstract
Inorganic (minerogenic) particles received from streams during runoff events cause undesirable increases in turbidity ( ; i.e., the light scattering coefficient, ) in many lakes and reservoirs. Quantification of particle inputs in the context of turbidity impacts and representative light scattering calculations (submodel), the necessary components in the development of a mechanistic multiple particle class model to simulate these impacts, are described for Schoharie Creek, N.Y. Light scattering attributes of minerogenic particles, including number concentration , size distribution (PSD), composition, and projected area per unit volume , are quantified for three runoff events through analyses by scanning electron microscopy interfaced with automated X-ray microanalysis and image analysis (SAX). The combined credibility of the light scattering submodel and SAX to represent the light scattering features of minerogenic particles is depicted by the consistency of calculated scattering efficiencies with theory and the strength of the reported relationship. Particles in the size range of were responsible for and in the stream, with greater contributions by the larger particles of this range at elevated stream flows. Empirical relationships are developed to predict and PSD from or stream flow.
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Acknowledgments
This study was funded by the New York City Department of Environment Protection. Field sampling was conducted by B. A. Wagner, M. Spada, and A. R. Prestigiacomo. This is Contribution No. 248 of the Upstate Freshwater Institute.
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Published In
Journal of Environmental Engineering
Volume 133 • Issue 9 • September 2007
Pages: 931 - 940
Copyright
© 2007 ASCE.
History
Received: Mar 31, 2006
Accepted: Feb 28, 2007
Published online: Sep 1, 2007
Published in print: Sep 2007
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