竖直微润灌土壤水分运动数值模拟与验证

为进一步认识微润灌土壤水分运动规律,进而指导微润灌工程设计,依据非饱和土壤水分运动理论,建立了竖直微润灌土壤水分运动模型,并用SWMS-2D软件进行求解。通过室内试验,对单位长度微润管入渗量、土壤湿润锋运移值和土壤剖面含水率等指标的模拟值进行分析验证。结果表明,模拟值与实测值一致性较好,所建模型能比较真实地反映竖直微润灌土壤水分运动的状况,利用SWMS-2D软件对竖直微润灌土壤水分运动进行模拟具有可行性。

Numerical simulation and verification of soil water movement in vertical moistube-irrigation

Further understanding of the soil water movement in moistube-irrigation can be guidance for engineering design. A mathematical model of soil water movement in vertical moistube-irrigation was established based on the unsaturated soil water movement theory. The model was then solved by the SWMS-2D software. The simulated indexes, including the infiltration capacity per unit length, movement of the soil wetting front and moisture content in the soil profiles were verified by indoor moistube-irrigation experiments. It shows that the simulated results agreed well with measured values, indicating that the model can truly reflect soil water movement during moistube-irrigation. It is feasible to simulate soil water movement for the vertical moistube-irrigation is proved by SWMS-2D.