Field measurements of stream reaeration coefficient

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Bacchus, A.

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Ontario Ministry of the Environment

Abstract

Studies were carried out during the summer of 1978, to measure the atmospheric reaeration rate coefficients for selected reaches of the Grand and Speed rivers as part of the Grand River Basin Water Management Study. The measurement technique described in this report - the "modified tracer" technique - was developed by the United States Geological Survey, U.S. Department of the Interior. It utilizes ethylene as a tracer gas and Rhodamine WT dye as a dispersion and dilution tracer. This report describes theoretical background, experimental procedure and data analysis for the study of reaeration rates in surface waters. The field study section outlines typical manpower and equipment requirements and sampling location considerations. Schematic diagrams show the method of dye injection and dye detection systems. Sample data are then subjected to typical computations, and a comparison is made between experimental and predicted reaeration rates. A listing of the computer program HGREDYET, developed to compute reaeration rate coefficients, and a sample copy of the input and output are presented in the Appendix. The results of these studies indicate that the modified tracer technique is a useful tool for measuring the atmospheric reaeration rate coefficient.

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Archive of Agri-Environmental Programs in Ontario, Ontario Ministry of the Environment, Other O.M.E. Environmental Reports, tracer gas, dye, modifed tracer, Rhodamine WT dye, dispersion and dilution tracer, reaeration, reaeration rates

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