In connection with the increased attention to the Northern Sea Route, an attempt was made to using satellite imagery for mapping the distribution of shoals in the Yenisei Delta, representing the closing link of water transport access to the ocean. To study the shoals, modern images from the Sentinel-2 satellite with a sufficiently high spatial (10 m) and spectral (12 channels) resolution, obtained on various dates during the summer low water period, are used. The map of the shoals has been compiled on the Tanamo-Munguyskoye extension of the delta. This map shows sandy and sandy-silty riverbanks, highlighted shallows of the estuary bay, and riverbed channel zones. Additionally, bottom topography forms are reflected ¬ sections of a ridges topography on sandbanks, underwater extensions of channels and rod zones in the estuary, and the distribution of aquatic vegetation is shown. For different objects, various images and methods of their interpretation are used. Sandbanks, ridges on them, underwater continuation of the channels are decrypted according to visual interpretation of the July pictures in the red zone. To highlight the fuzzy contours of sand and sandy-silty shoals, brightness quantization of these images is used. To control the correctness of distingwishing of hard-to-decode sandy-silty sandbanks, indicative interpretation is used for images taken in August, when aquatic vegetation develops on these sandy-silty shoals, which are clearly detected in color images synthesized with natural color reproduction. The boundaries of silty shoals are revealed in the images taken in September, when the submerged vegetation developed on them receives maximum areas. In the same pictures, rod zones are also distinguished. To identify the continuation of the rod zones in the estuary, color synthesis of multytemporal images is used. Comparison of the compiled map with topographic and river-pilot maps of previous years allows us to judge the changes in the distribution of the shallows during the warming period - their partial erosion at the heads of the large islands of Lopatin and Sudniy.
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Publication History
Received: 02.10.2020
Published: 24.02.2020


2021 issue 1
DOI 10.30533/0536-101X-2021-65-1