Hydrus-3D在设施膜孔灌水氮再分布过程中的应用研究

通过室内试验结果与Hydrus模型模拟计算结果对比分析,认为点源二维、点源三维模拟膜孔灌溉均作了过分的简化,特别是在水平湿润锋的模拟方面,相对误差较大。本文将膜孔处土壤以粗沙代替进行三维模拟,并与室内试验结果进行了验证,得到了较好的模拟结果。

Study on application of hydrus-3D to simulation on process of nitrogen and water redistribution of film-hole irrigation

With the contrastive analysis between the results of laboratory experiment and Hydrus simulated calculation， it is considered that both the point-source 2-D simulation and the point-source 3-D simulation on the film-hole irrigation are over simplified， especially more larger relative errors are there in the aspect of the simulation of the horizontal wetting front. A 3-D simulation is made herein by replacing the soil at the film-hole with coarse sand， and then the results are compared with those from the laboratory experiment. In this way， better simulation results are generally obtained.