Hydrophysical Characteristics of Sand Soils: Modeling the Restoration of Water-Retaining Capacity
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Restoration of the water-retaining capacity of light soils was carried out according to semiempirical dependences of moisture conductivity on capillary pressure with their physical parameters in the regime of an unsaturated moisture content. The relationship between the granulometric composition and the intensity of moisture conductivity at different moisture values is investigated. Moisture conductivity as a hydrophysical characteristic reflecting the thermodynamic state of soil water is used in the calculation of parameters for empirical modeling. The obtained data were used for the restoration of the main hydrophysical characteristic by mathematical modeling using the semiempirical model of M. van Genuchten. Water retention curves are qualitatively similar for all soil types. The quantitative difference is due to the increase of the matrix potential during the transition from sand to loamy sand due to changes in the granulometric composition. The shift of water-holding curves in the direction of decreasing moisture was observed for the same soil potential. This indicates an increase in the water-retaining capacity as the soil weight and dust fraction increase.
Keywordshydrophysical functions granulometric composition basic hydrophysical characteristic moisture conductivity pedotransfer functions water balance porosity gravity flow
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- 1.Globus, A.M., Pochvenno-gidravlicheskoe obespechenie agroekologicheskikh matematicheskikh modelei (Soil-Hydraulic Supply of Agroecological Mathematical Models), Leningrad: Gidrometizdat, 1987.Google Scholar
- 2.Voronin, A.D., Energy concept of the physical state of soils, Pochvovedenie, 1990, no. 5, pp. 7–19.Google Scholar
- 3.Aver'yanov, S.F., Dependence of soil water permeability on air content, Dokl. Akad. Nauk SSSR, 1949, vol. 69, no. 2, pp. 142–144.Google Scholar
- 4.Likhatsevich, A.P., Study of the hydrophysical properties of soils, Vesti Nats. Akad. Nauk (Minsk), 2013, no. 4, pp. 40–45.Google Scholar
- 6.Kachinskii, N.A., Fizika pochvy (Soil Physics), Moscow: Vysshaya shkola, 1979.Google Scholar
- 7.Smagin, A.V., Teoriya i praktika konstruirovaniya pochv (Theory and Practice of Soil Construction), Moscow: Mosk. Gos. Univ., 2012.Google Scholar
- 8.Shein, E.V., The particle-size distribution in soils: Problems of the methods of study, interpretation of the results, and classification, Eur. Soil Sci., 2009, vol. 42, no. 3, pp. 284–291.Google Scholar
- 12.Kulik, K.N. and Salugin, A.N., Markov chains of deflation of soil and vegetation cover of pastures of the Black lands, Ross. S-kh. Nauka, 2003, no. 5, pp. 34–37.Google Scholar
- 13.Salugin, A.N., Dynamic modeling of degradation processes in agroecology, Doctoral (Agric.) Dissertation, Volgograd, 2006.Google Scholar
- 14.Salugin, A.N., A structural model of the region’s water balance, Vestn. Volgogr. Gos. Akad., 2015, no. 33, pp. 216–223.Google Scholar