地下滴灌土壤水运动和溶质运移的数学模型及验证

Mathematical Model for Simulating Water Flow and Solute Transport During Non-steady Diffusion From Subsurface Trickle Source

摘要: 以非饱和土壤水运动理论和多孔介质中溶质运移的对流－弥散理论为基础，建立了地下滴灌条件下描述地埋点源土壤水运动和溶质运移的数学模型。模型中对滴头边界进行了简化，并对其可行性进行了检验。模拟计算结果得到室内试验资料验证。该模型可用来描述地下滴灌土壤水、肥运动和分布规律，以便为地下滴灌系统的合理设计提供理论依据。

Abstract: A three-dimensional axi-symmetrical model was developed to describe water flow and solute transport in variably saturated, rigid and homogeneous soil with subsurface drip irrigation and fertigation. A new hypothesis to simplify the boundary condition at the vicinity of emitters is used and tested in this model. Results of simulation was verified by the results of laboratory test.