Казанский (Приволжский) федеральный университет, КФУ
КАЗАНСКИЙ
ФЕДЕРАЛЬНЫЙ УНИВЕРСИТЕТ
 
MINIMIZING EVAPORATION BY OPTIMAL LAYERING OF TOPSOIL: REVISITING OVSINSKY'S SMART MULCHING-TILLAGE TECHNOLOGY VIA GARDNER-WARRICK'S UNSATURATED ANALYTICAL MODEL AND HYDRUS
Форма представленияСтатьи в зарубежных журналах и сборниках
Год публикации2019
Языканглийский
  • Обносов Юрий Викторович, автор
  • Библиографическое описание на языке оригинала Kacimov A.R, Obnosov Y, J. Šimůnek, Minimizing Evaporation by Optimal Layering of Topsoil: Revisiting Ovsinsky's Smart Mulching-Tillage Technology Via Gardner-Warrick's Unsaturated Analytical Model and HYDRUS//Water Resources Research. 2019, 55(5), p. 3606-3618. DOI: 10.1029/2018WR024025, http://dx.doi.org/10.1029/2018WR024025 (IF=4.397, Q1)
    Аннотация Ovsinsky (1899) suggested and tested a soil water conserving technology of no-till treatment of topsoil used as a substrate of rain-snow-fed field crops in a semi-arid environment in southern Russia. We model Ovsynsky's unsaturated flow fragment, in which 1-D steady evaporation through a two-layered soil from a horizontal static water table to a dry soil surface takes place. Gardner's exponential and algebraic functions are used for the unsaturated hydraulic conductivity–suction head relations. The vertical evaporation flux depends on the diads and triads (correspondingly) of the parameters of these functions, e.g., the saturated hydraulic conductivity and the sorptive number of the two layers. The flux, as a function of the relative thickness of the upper stratum, is analytically found from the solution of one or two nonlinear equations. This relation can be non-monotonic and exhibits either a minimum or maximum depending on whether this stratum is coarser or finer than the subjacent stratum fed from a horizontal isobar. HYDRUS1D simulations confirm these extrema. This explains the experimental results from the literature on mulching/tillage/soil crusting-sealing, which can increase, decrease or have no impact on evaporation from a shallow water table. Alterations of the soil's homogeneity to reduce evaporation losses can improve the hydrological balance of soil profiles.
    Ключевые слова Gardnerian unsaturated conductivity, steady evaporation from a water table, two-layered soils, HYDRUS simulations
    Название журнала Water Resources Research
    URL http://dx.doi.org/10.1029/2018WR024025
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