地膜覆盖条件下SPAC系统水热耦合运移模型的研究  

A model of heat and water flow in SPAC under transparent polyethylene mulch

作　　者：吴从林[1] 黄介生[1] 沈荣开[1] 

机构地区：[1]武汉水利电力大学水利系,湖北武汉430072

出　　处：《水利学报》2000年第11期89-96,共8页Journal of Hydraulic Engineering

摘　　要：本文建立了地膜覆盖条件下SPAC系统水热耦合运移模型 .该模型由大气、植物冠层、地膜覆盖层和土壤四层组成 .根据能量平衡原理建立了各层的能量平衡方程 .采用牛顿 -莱普森方法和有限差分法求解了各能量平衡方程和土壤水分及温度剖面 ,并用冬小麦的实测资料对模型进行了验证 ,结果表明模型具有一定的精度 .此外 。A numerical model for analyzing the heat and water flow in the SPAC system under transparent polyethylene mulch is studied. A system consists of four layers including atmosphere, canopy, mulch and soil is established in the model. Energy balance equations are derived for each layer. Soil heat and water flow are described by one dimensional equations in which the interaction between heat and water is considered through the coefficients. Newton Raphson and finite difference methods are used to solve these equation. The model is verified by comparing the simulated soil temperature and soil pressure head profiles with measured data. The result shows that the agreement is satisfactory.

关 键 词：地膜覆盖 SPAC系统 腾发量 水热运移 

分 类 号：S152.7[农业科学—土壤学]