Assessment of overgrowth of the Chelbas group of the Azov Sea Limans with aquatic vegetation
The Chelbas Limans play crucial role in the reproduction of semi-anadromous fish species. The efficiency of their spawning is closely related to the overgrowth of spawning grounds, therefore, the study of aquatic vegetation in the limans is essential for fisheries. This study is aimed at the investigation of the area and intensity of overgrowth of the Chelbas Limans with aquatic vegetation using remote sensing and GIS technologies. The materials on the dynamics of overgrowth of the Azov Sea limans belonging to the Chelbas group are presented for the period 2016–2021. The assessment of the overgrowth of these water bodies was carried out using the Modified Normalized Difference Water Index (MNDWI) and the radiometric Normalized Difference Vegetation Index (NDVI), which were calculated from the multispectral images of the European Space Agency Sentinel-2 satellite. The data of satellite remote sensing have been compared with the data of botanical surveys and visual observations. The area of overgrowth with aquatic vegetation in the Kushchevaty Liman varied within the range from 15 to 93 %, in the Gorkiy Liman it ranged within 12–65 %, and in the Sladkiy Liman the overgrowth area did not exceed 1.7 %. A four-level classification of the overgrowth of the water bodies according to the NDVI is proposed: class 0 is from -1.0 to -0.1, class 1 is from -0.1 to 0.3, class 2 is from 0.3 to 0.5, and class 3 is from 0.5 to 1.0. Examination of the aquatic vegetation in the Chelbas Limans has shown the dependence of the area of overgrowth of these water bodies with macrophytes on the regime of freshwater and seawater influx to the limans.
| Main Authors: | , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2021
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| Subjects: | Spawning grounds, Overgrowth, Semi-anadromous fish species, Modified Normalized Difference Water Index (MNDWI), Freshwater flow, Vegetation cover classification, Normalized Difference Vegetation Index (NDVI), Зарастание, Полупроходные виды рыб, Нерестилища, Радиометрический вегетационный индекс (NDVI), Водный индекс (MNDWI), Поступление пресной воды, ASFA_2015::M::Macrophytes, ASFA_2015::G::GIS, ASFA_2015::V::Vegetation cover, |
| Online Access: | http://hdl.handle.net/1834/41781 |
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| Summary: | The Chelbas Limans play crucial role in the reproduction of semi-anadromous fish species. The efficiency of their spawning is closely related to the overgrowth of spawning grounds, therefore, the study of aquatic vegetation in the limans is essential for fisheries. This study is aimed at the investigation of the area and intensity of overgrowth of the Chelbas Limans with aquatic vegetation using remote sensing and GIS technologies. The materials on the dynamics of overgrowth of the Azov Sea limans belonging to the Chelbas group are presented for the period 2016–2021. The assessment of the overgrowth of these water bodies was carried out using the Modified Normalized Difference Water Index (MNDWI) and the radiometric Normalized Difference Vegetation Index (NDVI), which were calculated from the multispectral images of the European Space Agency Sentinel-2 satellite. The data of satellite remote sensing have been compared with the data of botanical surveys and visual observations. The area of overgrowth with aquatic vegetation in the Kushchevaty Liman varied within the range from 15 to 93 %, in the Gorkiy Liman it ranged within 12–65 %, and in the Sladkiy Liman the overgrowth area did not exceed 1.7 %. A four-level classification of the overgrowth of the water bodies according to the NDVI is proposed: class 0 is from -1.0 to -0.1, class 1 is from -0.1 to 0.3, class 2 is from 0.3 to 0.5, and class 3 is from 0.5 to 1.0. Examination of the aquatic vegetation in the Chelbas Limans has shown the dependence of the area of overgrowth of these water bodies with macrophytes on the regime of freshwater and seawater influx to the limans. |
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