The Generalized Dependence of Soil Cover Emissivity on Temperature and Soil Moisture in the Upper Ob River Basin
The results of measurements of the dielectric and radio emission characteristics of soils sampled in the floodplains of the Ob, Alei, Anuy, Katun, and Charysh rivers in the Altai Territory are presented. Soil samples were obtained on test areas flooded during spring floods, as well as on test sites distanced from rivers and not falling into the zones of possible flooding. Laboratory measurements of dielectric and radio-emitting characteristics of soils were conducted with a bridge type installation using a phase difference meter FK2-18 at the frequency of 1.413 GHz. For samples collected in river floodplains, generalized dependencies of refractions and absorptions on volumetric moisture and temperature are developed. The measured dependencies of the dielectric characteristics on the temperature in the range from 262 to 290 K and on the volumetric moisture in the range from 0 to 0.55 cm3 / cm3 are used to calculate soil cover emissivity. Based on the established regularities, a generalized dependence of the soil moisture on the emissivity of soil cover is calculated. The obtained result is an important step in solving the problems of restoring the spatial-temporal distribution of soil moisture from the data of the L-band satellite microwave remote sensing.
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