Spectral Reflectance in the Spatial-temporal Dynamic of Turbidity, Itaipu Reservoir, Brazil
DOI:
https://doi.org/10.11137/1982-3908_2021_44_41228Keywords:
Suspended solids, NDTI, Landsat-8/OLIAbstract
Water quality and the useful life of reservoirs and dams are influenced by the entry of suspended solids, in addition to reducing their
transparency and storage capacity. It is primary to monitor and analyses its space-time dynamics. Thus, the objective of this work is
to characterize the dynamics of the Itaipu Reservoir waters from turbidity, rainfall and spectral reflectance data. To characterize the
dynamics, the reservoir was divided into 18 aquatic compartments between upstream and downstream, using precipitation data from
the TRMM sensor and Landsat 8 images in different precipitation situations. NDWI, MNDWI and NDTI water spectral indexes were
calculated from Landsat 8 images. The results showed high correlation between the NDTI index and the turbidity (R² = 0.91). Then the
NDTI images were reclassified into low, medium and high turbidity. A strong correlation between turbidity and 4 Band corresponding
to the spectral range of red (R² = 0.94) was also obtained. The precipitation has a determinant influence, being the Paraná River, in the
periods of greater precipitation, the main agent in sediment transport. The space-time dynamics showed that the lateral compartments
of the reservoir have less influence on sediment transport. In this sense, our analysis brought new elements to understand the turbidity
variation in these Itaipu Reservoir compartments, as well as the spectral reflectance dynamics in the space-time characterization related
to turbidity.
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