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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Karavayskiy A. Yu., Lukin Y. I., Pogoreltsev E. I.
Заглавие : Joint studies of water phase transitions in Na-bentonite clay by calorimetric and dielectric methods
Место публикации : Cold Reg. Sci. Technol. - 2018. - Vol. 153. - P.172-180. - ISSN 0165232X (ISSN), DOI 10.1016/j.coldregions.2018.04.010
Примечания : Cited References: 30. - The authors are sincerely grateful to the reviewers for their concerned analyses of the content of this paper and providing the valuable helpful discussion that allowed us to introduce many principle improvements in the text of the manuscript. This work was supported by Programs II.12.1. Fundamental Research SB RAS, Russia.
Ключевые слова (''Своб.индексиров.''): frozen soil--non-freezing water--unfrozen water--bound water--phase transitions--dsc--dielectric permittivity--dielectric model
Аннотация: The present study consisted of an experimental investigation of phase transitions of soil water contained in moist Na-bentonite clay, using the differential scanning calorimetry (DSC) method, within the temperature range from −40 to 20 °C. Based on the results of DSC analysis, the following components of soil water were found in the frozen bentonite: non-freezing water, unfrozen water and ice. The proposed method of processing the obtained experimental calorimetric data allowed us to determine the temperature dependencies of the content of particular soil water components. Latent heat of fusion was found in two cases, namely: where the ice was transformed into bound or unbound unfrozen soil water. The results of the investigation into phase transitions, obtained via calorimetric measurements, were used to substantiate the method for studying the phase transitions of soil water by dielectric measurements. With this in mind, complex relative permittivity testing was conducted on the same moist Na-bentonite clay, in the temperature range from −30 to 0 °C and a gravimetric moisture range from the dry soil to 1 g/g. Based on the results of these dielectric tests and a refractive dielectric mixture model (RDMM), the following components of water were identified in the frozen soil: tightly bound water, loosely bound water, unbound water and ice. The dependences of the content of these components of soil water on the temperature were calculated. It was shown that the increase in the mass of unfrozen loosely bound water, as a result of a decrease in the ice mass, determined with dielectric measurements, is quantitatively consistent with the dependence calculated using calorimetric testing. This proves that the changes of the mass of the loosely bound water, determined by dielectric measurements, is a result of the phase transition and the corresponding temperature dependence can be used to determine the characteristics of these phase transitions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Karavayskiy A. Yu., Lukin Y. I., Molostov I. P.
Заглавие : A dielectric model of thawed and frozen Arctic soils considering frequency, temperature, texture and dry density
Место публикации : Int. J. Remote Sens. - 2020. - Vol. 41, Is. 10. - P.3845-3865. - ISSN 0143-1161, DOI 10.1080/01431161.2019.1708506. - ISSN 1366-5901 (eISSN)
Примечания : Cited References: 39
Аннотация: A dielectric model was developed for thawed and frozen mineral soils, based on the refractive mixing dielectric formula and the dielectric measurement data for three soils collected in the Arctic tundra of the Yamal Peninsula. The refractive mixing dielectric model was used in conjunction with the Debye multi relaxation equations as a theoretical model to fit the measured complex relative permittivity spectra as a function of soil moisture and temperature. As a result, the dielectric spectroscopic parameters for the various components of water in the soil, such as the low- and high-frequency limits of the complex relative permittivity, the times of the corresponding relaxations, and the specific conductivity, were simultaneously determined for soils with different clay contents for all measured temperatures. As the theoretical temperature dependences of these parameters, the Clausius–Mossotti, Eyring, and linear equations for the conductivity were used. By using approximations of the measured data with these formulas, the parameters of the temperature-dependent model were derived, such as the coefficient of volume expansion, energy and entropy of activation, and coefficient of thermal conductivity. A set of the parameters discussed above in conjunction with the refractive mixing formula is a temperature- and mineralogically dependent multi-relaxation spectroscopic dielectric model, which enables estimation of the permittivity of moist soils as a function of dry soil density, moisture, frequency, temperature, and texture. The statistical error of the proposed dielectric model was estimated in terms of the normalized root-mean-square error (nRMSE), which was equal to 5% and 25% for the dielectric constant and dielectric loss factor, respectively.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Muzalevskiy K. V., Fomin S. V., Karavayskiy A. Yu.
Заглавие : Optimum frequency range for remote sensing of soil moisture with various texture, density and organic matter content
Коллективы : IEEE International Multi-Conference on Engineering, Computer and Information Sciences 2022
Место публикации : 2022 IEEE International Multi-Conference on Engineering, Computer and Information Sciences, SIBIRCON 2022: IEEE, 2022. - P.1130-1133. - , DOI 10.1109/SIBIRCON56155.2022.10017095
Примечания : Cited References: 28. - The investigation supported by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation, project №22-17-20042
Аннотация: In this article, the frequency range, within which the dependence of reflectivity on soil moisture is invariant respect to changes in soils texture, dry bulk density and organic matter content, has been established. The analysis is based on dielectric measurements of 16 natural mineral nonsaline soils in the frequency range from 45-100 MHz to 2 GHz. The moisture of soils varied from air dry to the field capacity. The clay, silt and sand content in the soil samples are ranging from 0% to 76%, from 1% to 93%, and from 0 to 100%, respectively. The dry bulk density and organic matter content in soil samples are ranging from 0.7 g/cm3 to 1.8g/cm3, and from 0.6% to 69%, respectively. As a result, it is shown, that the variations in texture, dry bulk density, and organic matter content of soils have the least effect in the frequency range from 125 MHz to 820 MHz (with minimum at a frequency of 350 MHz) on the dispersion of the dependence of refractive index on volumetric moisture. As an example, the case of smooth bare soil surface remote sensing at a frequency of 435 MHz is considered. It is shown that for the entire set of soils, a single calibration curve for conversion of reflectivity to volumetric soil moisture is sufficient to retrieve soil moisture with a root-mean square error of 2.1% and a determination coefficient of 0.981. The established frequency range can be recommended for microwave remote sensing methods of soil moisture measurement, not depended on soils texture.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Fomin S. V., Muzalevskiy K. V., Karavayskiy A. Yu., Romanov V., Lipshin A., Mikhailets M.
Заглавие : Validation of Dobson's, Schmugge's, and Mironov's dielectric models at four typical agrosoils of Krasnoyarsk and Krasnodar krais
Коллективы : IEEE All-Russian Microwave Conference
Место публикации : Proceedings - 2022 IEEE 8th All-Russian Microwave Conference, RMC 2022. - 2022. - 8th IEEE All-Russian Microwave Conference, RMC 2022 (23 - 25 November 2023, Moscow, Russian Federation) Conference code: 187597. - P.349-352. - , DOI 10.1109/RMC55984.2022.10079332
Примечания : Cited References: 16. - The investigation supported by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation, project №22-17-20042
Аннотация: In this article, in a wide frequency range from 300 MHz to 2 GHz at a temperature of 20C, the validation of Dobson's, Schmugge's, and Mironov's (with one, two, and three soil water relaxations) dielectric models was carried out using four samples of typical agrosoils taken from the arable layer. Variations in the clay fraction, dry bulk density, and organic matter content of soil samples ranged from 32% to 56%, from 1.1 g/cm3 to 1.7 g/cm3, up to 6.9%, respectively. It is shown that the Mironov's model with two relaxations (M2) has the best accuracy in describing the measured relative complex permittivity (RCP) spectra for all soils in average. The coefficient of determination (R2) and root-mean square error (RMSE) appeared to be equal of Rε'2=0.907 (RMSEε'=0.83) for real and Rε''2=0.960 (RMSEε'' =0.89) for imaginary parts of RCP, when comparing the measured and calculated RCPs. Error of soil moisture retrieval, based on M2 dielectric model and the observations of reflection coefficient at nadir was estimated. For four agricultural soils, it is shown that the retrieved volumetric soil moisture values with the determination coefficient R2=0.975 and RMSE =2% coincide with the true values of soil moisture. It has also been found that small inaccuracies (several tens of percent) in determining the dry bulk density and clay content of soils have practically no effect on the error in retrieving the volumetric soil moisture.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Karavayskiy A. Yu., Lukin Y. I.
Заглавие : The effect of clay content on the spectra of permetivity of mineral soils at positive temperatures
Колич.характеристики :4 с
Коллективы : Radiation and Scattering of Electromagnetic Waves 2023
Место публикации : Conf. Proc. - Radiat. Scatt. Electromagn. Waves, RSEMW. - 2023. - P.456-459. - , DOI 10.1109/RSEMW58451.2023.10201998
Примечания : Cited References: 17. - The work was financially supported by the Russian Science Foundation and the Krasnoyarsk Regional Fund for Support of Scientific and Scientific and Technical Activities within the framework of the scientific project No. 22-27-20112
Аннотация: In this research, it was studied the crossover frequencies of the spectra of the real part of the permittivity of moist mineral soils with different clay content from 10 to 64% in the frequency range from 15 MHz to 15 GHz and in the temperature range from 25 to 0 °C. Based on the experimental dependences obtained, empirical models were proposed for the average crossover frequency of the soil of the real part of the permittivity spectra in the range of changes of these frequencies values with temperature changes, as well as for the half-widths of the ranges of changes.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karavayskiy A. Yu., Lukin Y. I.
Заглавие : Influence of dielectric relaxations of soil water on the temperature dependence of soil permittivity
Колич.характеристики :10 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 12. - P.1190-1199. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X24700206. - ISSN 15626911 (eISSN)
Примечания : Cited References: 23. - This work was supported by the Russian Science Foundation and the Krasnoyarsk Regional Fund of Science and Technology Support within the framework of scientific project no. 22-27-20112
Аннотация: Using a generalized refractive mixture dielectric model, the influence of the relative permittivity spectra of bound and unbound water in mineral soil on the nature of the temperature dependence of the relative permittivity of natural mineral soil, with a clay fraction content of 41.3%, was studied in the electromagnetic field frequency range from 50 MHz to 15 GHz. The causes of the emergence of intersections in the relative permittivity spectra of mineral soil, obtained at different temperatures but for a sample of the same moisture content, have been studied. It has been proved that the emergence of such an intersection point in the frequency range up to 1.5 GHz is due to the Maxwell–Wagner effect in bound water. The dependences of the frequency of the intersection point of the relative permittivity spectra of mineral soil on the temperature and volumetric content of bound and unbound water have been studied.
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