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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 1, pp. 220-230

Assessment of meteorological drought and morphometric analysis of the relief of agrolandscapes using remote sensing data and meteorological observation data

A.I. Pavlova 1 
1 Novosibirsk State University of Economics and Management, Novosibirsk, Russia
Accepted: 23.01.2024
DOI: 10.21046/2070-7401-2024-21-1-220-230
The work is devoted to the assessment of meteorological drought and morphometric analysis of relief using remote sensing data and meteorological observation data. Standardized Precipitation and Evaporation Index (SPEI) is calculated using daily meteorological data (precipitation and air temperature) from 1970 to 2021. The research was carried out on the example of Novosibirsk Region. Analysis of the temporal distribution of drought in the central forest-steppe Priobsk, Barabinsk and north forest-steppe Kolyvano-Prisairsk agrolandscapes showed that the long-term average SPEI value is characteristic of normal moisturing. However, the nature of the change in the climate index in some years is significantly different. Space images from Japanese satellites ALOS DSM (Advanced Land Observing Satellite Digital Surface Model) and ALOS PALSAR (Phased Array L-band Synthetic Aperture Radar) were used for morphometric analysis of the relief. The central forest-steppe Barabinsk agrolandscape is located on a lowland plain. The normalised height in the Central forest-steppe Barabinsk agrolandscape is 20 m lower than in the Priobsk agrolandscape and 80 m lower than in the Kolyvan-Prisairsky agrolandscape. The Barabinsk agrolandscape is characterized by the prevalence of insignificant slope (less than 0.50). The base level of erosion is 6 m on average. The average value of the topographic index LS (Length and Slope) is about 7 times less than in the central forest-steppe Priobsk agrolandscape and 19 times less than in the Kolyvan-Prisair agrolandscape. In the central forest-steppe Barabinsk agrolandscape, the frequency of occurrence of droughts of low intensity in July and August is the same (0.31). The incidence of moderate-intensity drought in May and August is the highest (0.32). The central forest-steppe Priobsk agrolandscape represents a gentle plain. There are droughts of moderate and extreme intensity (26 %), strong intensity (25 %), weak intensity (23 %). There are no extreme droughts in the conditions of the hilly Prisair Plain for the Kolyvan-Prisair agrolandscape during the growing season of grain crops from May to August. Repeatability of droughts of weak and moderate intensity is 42 and 40 % of the total number of cases, droughts of strong intensity occur in 18 % of cases.
Keywords: standardized precipitation and evaporation index, agrolandscapes, agroclimatic resources, morphometric relief parameters, geomorphometry, digital elevation model
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