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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2025, Vol. 22, No. 1, pp. 244-258

Comparison of results of turbidity and suspended matter concentration fields determination for the Mzymta, Sulak and Terek rivers based on satellite data and in situ measurements

N.A. Knyazev 1 , P.D. Zhadanova 1 
1 Space Research Institute RAS, Moscow, Russia
Accepted: 03.12.2024
DOI: 10.21046/2070-7401-2025-22-1-244-258
The paper presents a performance comparison of algorithms for determination of turbidity field and suspended matter concentration of river outflows from optical images of the Sentinel-2 and Landsat-8, -9 satellites. The Mzymta River on the Black Sea coast and the Sulak and Terek rivers flowing into the Caspian Sea were selected as the study areas. The Nechad and Dogliotti algorithms implemented in the ACOLITE software package were used to estimate the parameters of suspended matter in the estuary boundaries of river outflows. The values of turbidity and suspended matter concentration obtained by the algorithms were compared with in situ measurements. High correlations were found for different regions when applying the Nechad algorithm at wind speeds of less than 2 m/s. For turbidities above 70 NTU (Nephelometric Turbidity Unit) or high wind speeds, the algorithm produced values strongly varying from the field measurements. The Dogliotti algorithm performed well for the Mzymta and Terek rivers, but the best fit was achieved at a high turbidity of more than 1000 NTU that was observed only for the Terek River.
Keywords: satellite monitoring, Sentinel, Landsat, in situ measurements, water turbidity, suspended matter concentration, ACOLITE, Mzymta, Sulak, Terek
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