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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2026-06-11 23:58 |
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Conference: Bucharest University Faculty of Physics 2026 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Remote Sensing-Based identification of sandy geological formations in the Letea and Caraorman areas using multispectral satellite imagery
Authors:
Sofia TĂNASE (1), Ana-Maria HRENIUC MOROȘAN (2)
Affiliation:
1) Faculty of Geology and Geophysics, Nicolae Balcescu 1, Sector 1, Bucharest, Romania
2) Cornel & Cornel Topoexim SRL, Vidra Street 31, Sector 6, Bucharest, Romania
E-mail
tanasesofia23@gmail.com
Keywords:
satellite imagery, NDWI, sand dunes, Sentinel-2
Abstract:
The purpose of this study is to perform a spatial analysis of sand dunes in the Danube Delta using multispectral satellite images. These dunes are located in the central part of the delta, approximately 25km inland from the current coastline.
The sandy deposits in the Letea area formed over an ancient loess plain, which was flooded following the rise in the Black Sea level after the last glacial period. The resulting landscape exhibits a pattern of alternating dune ridges and elongated interdunal depressions, formed through aeolian processes and partially stabilized by vegetation (Anastasiu, 1988)
Two satellite images from Sentinel-2 were used for the study, each containing 13 spectral bands, processed using the SNAP software. The analysis included RGB composition (B4, B3, B2) together with the use of the NDWI index to distinguish water from land. To ensure data consistency, the bands were resampled to a uniform spatial resolution of 10 m.
Sand dune formations in the Letea and Caraorman areas were highlighted using a false-color composite derived from NDWI, B8 (NIR) and B11 (SWIR). The sands appear as elongated structures with high reflectance in the infrared range. From a geological perspective, these are unconsolidated fluvio-aeolian sedimentary deposits, mainly composed of fine and medium sands shaped by aeolian processes.
In conclusion, the use of multispectral imagery represents a major advantage, enabling detailed geospatial analyses. This approach contributes to the advancement of geological research by allowing the clear identification and differentiation of sand dunes in the Letea and Caraorman areas, as well as a better understanding of their formation and orientation.
References:
Anastasiu N., 1988, Petrologie sedimetară, Editura tehnică, București
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