Use of reflectance band ratios to estimate suspended and dissolved matter concentrations in estuarine waters
- 1 April 2005
- journal article
- other
- Published by Informa UK Limited in International Journal of Remote Sensing
- Vol. 26 (8), 1763-1769
- https://doi.org/10.1080/01431160512331314092
Abstract
In the Tamar estuary (south‐west UK), the concentrations of coloured dissolved organic and suspended (total, organic and inorganic) matter were measured and related to in situ hyperspectral remote‐sensing reflectance (R rs) measurements. A simple method was used to determine the R rs signal from underwater optical measurements, in order to avoid any surface reflection effects. As previously observed in other estuaries, a large correlation was obtained between the R rs(850 nm)/R rs(550 nm) ratio and total suspended matter concentration. The same R rs ratio was also highly correlated to the inorganic suspended matter concentration. The corresponding relationships are linear. The R rs(400 nm)/R rs(600 nm) ratio correlates with the coloured dissolved organic matter concentration, according to a power law regression. These relationships, which appeared to be invariant during the summer period (June–September) and valid for the whole estuary, may be applied to airborne remote sensing data to map the tidal movements of turbidity in the estuary.Keywords
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