土壤包气带中气体对入渗水流运动影响的实验研究

Laboratory Study for Influence of Air on the Infiltration Flow in the Soil Unsaturated Zone

利用专门的实验系统,研究了降雨入渗过程中土壤包气中气压势形成、发展和消亡的规律及其对下渗水流运动的影响。结合成因分析,探讨了气压势形成的条件;审视和解释了气压势与土壤水总势能和地下水位的相互关系。实验结果表明,在地下水位埋深较浅的条件下(<2m),积水入渗时所形成的气压势将使下渗量减少1/3。

The regularity of the formation, development and disappearance of air pressure in the soil unsaturated zone for rainfall infiltration, and also its influence on the infiltration flow were investigated by the special experimental system. Meanwhile, combining with formation analysis the conditions forming air pressure were approached, and the relationship between air pressure, total potential of soil moisture and groundwater table was also examined and explained. When the groundwater table is more shallow (<2m), the experimental results show that the total ponded infiltration water affected by air pressure will reduced by one-third.