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探明非饱和土壤水分入渗中水—气运移的规律及相互关系,有利于促进水分入渗规律和溶质运移规律的深化研究。基于室内土柱试验,研究了在小雨量(15mm/d)连续降雨入渗条件和土中气相影响条件下水分入渗的变化规律。结果表明,土中水分入渗能力随时间和深度递减;气压势与含水率呈负相关,与基质吸力呈正相关;多项式和对数函数对土—水特征曲线的拟合较为理想;入渗系数随剖面深度加大而减少。试验结果较好地解释了试验过程中出现的积水现象,对深入研究非饱和土壤水分入渗规律意义重大。
Proving the law and correlation of water-gas migration in unsaturated soil water infiltration is helpful to deepen the research on the law of water infiltration and the law of solute transport. Based on the indoor soil column test, the variation of water infiltration under continuous rainfall infiltration with small amount of rainfall (15mm / d) and soil gas phase influence was studied. The results showed that the infiltration capacity of soil water decreased with time and depth. The pressure potential was negatively correlated with moisture content and positively correlated with substrate suction. The polynomial and logarithmic functions fitted well to the soil-water characteristic curve. The infiltration coefficient Decrease with increasing depth of section. The result of the experiment can explain the phenomenon of water accumulation during the experiment, which is of great significance to the further study of the law of unsaturated soil moisture infiltration.