WATER QUALITY IN MIXING ZONES

A method has been developed to delineate quantitatively waste concentrations throughout waste effluent mixing zones on the basis of densitometric measurements extracted from aerial photographs. A "mixing zone", as defined herein, is the extent of a receiving-water body utilized to dilute a waste discharge to a concentration characteristic of a totally mixed condition. Simultaneously-acquired color- infrared photographs and suspended solids water samples have been used quantitatively to delineate the mixing zone resulting from the discharge of a paper mill effuent at a study site within the state of Wisconsin. Digital scanning microdensitometer data were used to estimate and delineate suspended solids concentrations on the basis of a semi-empirical model. The results and experiences of the study have indicated that photographic photometry, if predicted on a limited amount of ground sampling, can be used to measure and delineate mixing-zone waste distributions as reliably and in more detail than conventional surface measuring techniques. The method has direct application to: (1) the establishment of definite and rational water quality guidelines; (2) the development of sampling and surveillance programs for use by governmental and private agencies; and (3) the development of design and location criteria for industrial and municipal waste effluent outfalls. /Author/

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  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Lillesand, T M
    • Scarpace, F L
    • Clapp, J L
  • Publication Date: 1975-3

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Filing Info

  • Accession Number: 00095968
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 2 1975 12:00AM