膜下滴灌土壤水、盐分运移数值模拟研究

Study on the Numerical Simulation of Soil Water and Salt Transport under Mulch Drip Irrigation

【目的】研究干旱农业区采用覆膜滴灌技术,在无覆膜的膜间裸露区内设置排盐沟条件下,覆膜滴灌土壤盐分运移和排盐沟表面排盐效果。【方法】利用hydrus-2D模型模拟研究该条件下二维土壤入渗湿润峰变化。【结果】滴头以下部位形成盐分淡化区域;排盐沟表面受蒸发影响呈现盐分累积现象。【结论】膜下滴灌排盐沟效果明显,排盐沟斜面积盐现象显著,该模型可以较好的模拟二维土壤入渗湿润峰变化。

【Objective】This project aims to apply plastic film mulching technique and set salt drainage ditch at the bare area without membranes for the purpose of finding out the effect of salt elimination in soil under mulch drip irrigation【Method】Hydrus- 2D model was applied to simulate the change of wetting front of2 D soil infiltration.【Result】The part under the dripper became to be dilute salt area; The surface of the salt draining ditch presented the phenomenon of salt accumulation because of evaporation.【Conclusion】The effect of salt elimination of the salt draining ditch was obvious under drip irrigation. The ramps of the salt drainage ditch accumulated the salt. This model could simulate the change of wetting front of 2D soil infiltration well.