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Reflektance a kvalita vody (2015)

| Written by  Published in: Publikační činnost ENKI
  • Vinciková, H., Hanuš, J., & Pechar, L. (2015). Spectral reflectance is a reliable water-quality estimator for small, highly turbid wetlands. Wetlands Ecology and Management, 23(5), 933-946.

Spectral reflectance from water surfaces was measured in small (0.01–5 km2), turbid, eutrophic fishponds and mesotrophic quarry lakes in the Třeboň basin (South Bohemia, Czech Republic). A spectral scanner for direct field measurements from water surfaces and a hyperspectral airborne scanner were both used. The quarry lakes and fishponds differed in their spectral signature, which reflected the extent of their eutrophication. Their chlorophyll-a (chl-a) concentrations ranged from 2 to 455 µg/l−1. Various algorithms were tested to best fit the relationships between reflectance patterns and the water-quality parameters used—concentration of chl-a and the total amount of suspended solids. The reflectance ratios at 714 and 650 nm gave the best estimates for chl-a concentrations, and simple reflectance at near infrared wavelengths, especially at 806 nm, gave the best predictive values for total suspended solid evaluation (r 2 = 0.89). Field surface reflectance and airborne sensing measurements were well correlated; however, airborne reflectance data showed higher variability (r 2 = 0.93 and 0.86, respectively). The results support the validity of reflectance measurements, both field and airborne, as a rapid tool for evaluating water quality in many turbid and greatly disturbed, small water bodies.

Remote sensing; Water quality; Hyperspectral reflectance; Turbid inland waters; Chlorophyll; TSS