Techniques for Measuring Light Absorption, Scattering, and Particle Concentrations in Water

摘要

The purpose of the research reported was to investigate the usefulness of multispectral remote sensing techniques in determining the concentration of supended solids in aquatic environments. For the research, aerial photography and multispectral scanner imagery was used to record the upwelling radiation at various locations on the surface of the water. Procedures for determining the concentration of suspended solids are explored. Two techniques are discussed: The first applies to bodies of water that are shallow and fairly clear; The second applies to bodies of water that are deep or very turbid. The first technique is a direct outgrowth of earlier water-depth studies and, when the necessary ground-truth data are available, can also be used to determine water depth or the scattering and adsorption coefficients of the lake. The second has the advantage of requiring less ground truth data for interpretation of the remote measurements. Both techniques are feasible within certain operational constraints. Both give values of the concentration of suspended solids, relative to the concentration at a fixed point, for every location in a body of water for which multispectral data are available.