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本文建立了用于数值解的不同覆盖条件下土壤二维水热运动数学模型。该模型中多孔材料覆盖层(砂砾、秸秆等)被当作传热多孔介质处理,对水分传输的影响被当乍具有一定阻力的阻挡层处理,且将油纸、塑膜及土面增温剂等均视为薄膜类材料。省略了许多假设条件,因而使覆盖效应的研究建立在更加科学的基础上,可以更为深入地了解覆盖层在不同气候条件下对土壤水分蒸发、入渗及地温影响机理和程度。为综合评价和选用农用覆盖材料及其参数提供了手段。
In this paper, a mathematical model of soil two-dimensional hydrothermal movement under different coverage conditions is established. In this model, the porous material cover (gravel, straw, etc.) is treated as a heat-conducting porous medium and the effect on water transport is dealt with as a barrier layer with a certain resistance at first, and oil paper, plastic film and soil warming agent Etc. are considered as film-like materials. Omitting many assumptions, the study of cover effect is based on a more scientific basis to provide a more in-depth understanding of the mechanism and extent of influence of cover layer on soil moisture evaporation, infiltration and ground temperature under different climatic conditions. For comprehensive evaluation and selection of agricultural cover material and its parameters provide a means.