ISSN 0536-101X (print)
ISSN 2618-7299 (online)
+7 (499) 261-82-86
Русская версия
English version

Картографирование динамики дельты Енисея в начале XXI века по разновременным космическим снимкам

В.И. Кравцова, О.В. Вахнина, Е.Г. Харьковец

Страницы: 689–700

Аннотация. Для изучения изменений дельты Енисея в начале XXI в. выполнено сравнение космических снимков со спутников Landsat-7 1999 г. и Sentinel-2В 2017 г. В ходе их компьютерной обработки получена предкарта фактического распределения площадей размыва берегов и аккумуляции наносов. Для отображения медленно протекающих в условиях криолитозоны процессов предлагаются три типа карт: в масштабе 1:500 000 на всю территорию дельты, отображающая наличие и направленность изменений; 1:200 000 на всю дельту или ее крупные фрагменты, показывающая интенсивность процессов; карты 1:25 000 для отдельных наиболее динамичных участков дельты, отражающие реальные площади изменений.

Ключевые слова: аккумуляция наносов, береговая линия, карта динамики, космические снимки, предкарта изменений, размыв берегов, coastal erosion, coastline, dynamics map, pre-map of change, satellite imagery, sediment accumulation

Mapping the dynamics of the river Yenisei delta at the beginning of the XXI century by multitemporal satellite images

V.I. Kravtsova, O.V. Vakhnina, E.G.Kharkovets

Pages: 689–700

Summary. The Yenisei Delta is an important link to the Northern sea route, which, along with scientific tasks, determines the need to monitor its statement during climate warming. To study the changes in the delta at the beginning of the XXI century, a comparison of satellite images from Landsat-7 1999 and Sentinel-2B 2017 was created. To ensure the comparability of images, their geometric and brightness matching was performed. Automated coastline interpretation for each shooting date is performed by brightness quantization of near-infrared images. At the junction of the quantized images taken at different years, a raster image was obtained reflecting the appearance of water at the land (erosion of the coast) and the formation of land at the water (accumulation of sediments); this image serves as a pre-map. Due to the slow temp of the processes in the cryolithozone regions, the areas of the changed sections of the delta are small and their cartographic reproduction is possible only on a very large scale, the application of which for the delta is generally impractical. In this regard, 3 types of maps of different scales, coverage and content were proposed. Large-scale maps
(1:25 000 and larger) show real areas of change, but are compiled only for some of the most dynamic sections of the delta. Maps of scale 1: 200,000 are created for the entire area of the delta (desktop version, format A-2); they show areas where changes have occurred, reflect their direction (accumulation or erosion) and intensity, determined through the average annual velocity of the coastline replacement. The overview map of the entire delta of 1: 500,000 scale (book, journal version, format A-4) reflects the sections of the coastline dynamics and the direction of changes without a quantitative characteristic of their intensity.

Скачать статью