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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. 197-209

Remote microwave indicators of forest dryness

A.N. Romanov 1 , I.V. Khvostov 1 , I.V. Ryabinin 1 , D.A. Romanov 1 , D.N. Troshkin 1 
1 Institute for Water and Environmental Problems SB RAS, Barnaul, Russia
Accepted: 08.12.2023
DOI: 10.21046/2070-7401-2024-21-1-197-209
Using the example of test areas of pine forests (Altai Territory, Russian Federation; Abay Region, Republic of Kazakhstan), the dynamics of brightness temperatures of coniferous forests measured from the SMOS (Soil Moisture and Ocean Salinity) satellite during the period of large forest fires was studied. The impact of forest fires on forest microwave radiation has been assessed. The dielectric characteristics of pine branches and needles, birch branches and leaves at a frequency of 1.41 GHz were studied. We used a bridge-type laboratory setup based on an FK2-18 industrial phase meter, which makes it possible to measure the dielectric characteristics of dispersed mixtures and aqueous solutions using the bridge method in the frequency range from 0.3 to 10.0 GHz. The dependences of the refractive index and absorption indices of pine branches and needles, birch branches and leaves on the volume fraction of water in a living tree have been established. To assess the fire danger of forests, it is proposed to use a new approach based on a comprehensive analysis of the results of remote sensing, field and laboratory studies. New remote microwave indicators of forest dryness/wetness are proposed based on the use of satellite measurements of brightness temperatures in the microwave range and laboratory measurements of dielectric characteristics of a living tree, which allow taking into account the phase composition and dielectric properties of wood water and dry wood.
Keywords: birch, pine, branch, needles, leaves, temperature, moisture, forest fire, refractive index, absorption factor, complex permittivity, microwave range
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