Mapping of forest disturbance from winds of extratropical cyclones in the southern part of Sakhalin by remote sensing data

DOI: 10.35595/2414-9179-2024-1-30-581-587

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About the Authors

Vyacheslav A. Melkiy

Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, Laboratory of Volcanology and volcano hazard,
1B, Nauki str., Yuzhno-Sakhalinsk, 693022, Russia,
E-mail: vamelkiy@mail.ru

Alexey A. Verkhoturov

Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, Laboratory of Geochemistry and Regional Geology,
1B, Nauki str., Yuzhno-Sakhalinsk, 693022, Russia,
E-mail: ussr-91@mail.ru

Abstract

Deforestation was named one of the global environmental problems by the close of the 20th century. Tropical cyclones, which operate in the Northern-West Pacific during the summer and autumn and sometimes go far north, transforming into extratropical cyclones, are the main cause of damage for forest areas in Southern Sakhalin. In central parts of tropical cyclones, during their maximum development, pressure reaches 895 mbar, stable winds arising in atmospheric vortex can have speed up to 50 m/s, and gusts have speed up to 78 m/s. Storm winds with gusts have speed over 35 m/s, which are capable of knocking down free-standing trees, as well as causing significant damage to the forests. In October 2015, in the southern-west part of Sakhalin during the passage of typhoon Choi-wan, significantly forested areas were disrupted by winds. The purpose of the work was to investigate the extent and nature of damage to the forest, caused by winds during passage of extratropical cyclones over territory of the South-West of Sakhalin Island. Images of the research area were classified by “with training” method. The training sample was made up of a set of pixels representing images of sample plots, where geobotanical research was performed. It was revealed that total area of windthrows in the territory of Kholmsky and Nevelsky districts in south-west part of Sakhalin Island was 22 735 ha. To analyze character of windblow damages in researched area, the Normalized Difference Vegetation Index was calculated and areas with varying degrees of damage were identified in terms of content of phytomass, presented in form of green trees and clumps, as well as preserved underscrub and undergrowth. At the same time, it was revealed that among the affected stands, one can distinguish completely dead (occupy 19.85 % of the territory), partially damaged (41.85 %) and slightly damaged (38.29 %). Mapping forest disturbance from winds by remote sensing data after passing over territory of tropical cyclones makes it possible to quickly assess the disaster scale, as well as adjust reforestation plans for the coming few years. If using geoinformation technologies for processing data, time of work is significantly reduced.

Keywords

satellite imagery, mapping of forest, deforestation, extratropical cyclones, Normalized Difference Vegetation Index, geoinformation analysis

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For citation: Melkiy V.A., Verkhoturov A.A. Mapping of forest disturbance from winds of extratropical cyclones in the southern part of Sakhalin by remote sensing data. InterCarto. InterGIS. Moscow: MSU, Faculty of Geography, 2024. V. 30. Part 1. P. 581–587. DOI: 10.35595/2414-9179-2024-1-30-581-587