Research Article
Dec 1969
Basin Tracer Curves Interpreted by Basic Calcutta
Publication: Journal of the Sanitary Engineering Division
Volume 95, Issue 6
Abstract
A basin flow tracer test with pulse injection is essentially passage of a material shock wave. Virtual transit is related to the maximum slope on the dimensionless time versus concentration curve. The plug point, separating plug from non-plug flow, is located at the initial arrival of tracer for straight rising or convex upward ascents, and hypothetically at the first tangential subinflectum of ogive ascents. Plug fraction of flow extends from the origin to the plug point; dual flow exists from the plug point to the descending inflectum, beyond that flow is the mixed or eddied type. Short circuiting is indicated directly by the distance between plug point and nominal detention time. The negative exponent of the semi-logarithmic plot of the decline denotes the number of times the effective fraction of basin volume is extracted by non-plug flow. Curves replotted from the literature confirm this theory. Dispersion is measured by the angle between the tangent to the plug point with the vertical. A concise diagram having plug point and dispersion as coordinates permits comparison of basins.
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Published In
Journal of the Sanitary Engineering Division
Volume 95 • Issue 6 • December 1969
Pages: 1031 - 1050
Copyright
© 1969 American Society of Civil Engineers.
History
Published in print: Dec 1969
Published online: Feb 12, 2021
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Authors
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A. Adler Hirsch
Director, Bason and Filter Specialty Co., Shreveport, La.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.