Effects of Light Zenith Angle Variation on Spectral Responses of a Water Body’s Environmental Quality

D. S. Bhargava and D. W. Mariam
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D. S. Bhargava: University of Roorkee (now I.I.T.)
D. W. Mariam: University of Roorkee (now I.I.T.)

Environment Systems and Decisions, 2004, vol. 24, issue 4, 237-247

Abstract: Abstract The effect of light source zenith angle (θz) variation on the spectral reflectance measurement from sediment-laden water was studied in the laboratory using a spectroradiometer. Light source zenith angle in addition to sediment characteristics and concentration play a dominant role in affecting the reflectance characteristics of a suspension. With an increase in θz values, an increase in spectral reflectance is observed. The spectral reflectance characteristics of a water body also increase with the sediment concentration for all soil types and at all wavelengths. Empirical relationships between the spectral reflectance, suspended sediment concentration, and the light source zenith angle have been developed. Such a remote sensing technique for monitoring the concentration of the suspended sediment and their characteristics is a useful tool for economical estimation of a large water body’s quality related parameters vis-a-vis its environmental quality.

Keywords: spectral water quality; remote sensing; light zenith angle; spectral response; spectral environmental quality (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1007/s10669-005-0999-9

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