为揭示黄土高填方场地的降雨入渗规律,在延安某黄土高填方场地建立监测站,对天然降雨入渗条件下28 m深度范围内的土体含水率进行为期31个月的连续监测,结合降雨量、蒸发量及气温数据分析压实黄土中的水分迁移规律.结果表明:地面下3.5 m是大气影响深度,随降雨量和蒸发量变化,土体含水率变化存在明显波峰与波谷,并呈周年性变化趋势;地面下1.0 m是大气急剧影响深度,当单日降雨量＜29 mm/d时,土体含水率在周年性变化趋势背景下波动较小,当单日降雨量＞29 mm/d后土体含水率出现跳跃式骤升;降雨量越大,土体含水率的增幅越大,降雨持续的时间越长,水分迁移入渗的深度越大,监测期内降雨最大入渗深度为6.0～7.0 m.
Water Migration Law of Loess Deep Filled Ground
To unveil the rainfall infiltration patterns at a loess deep filled site,a monitoring station was established in Yan'an to continuously monitor the soil moisture content within a 28 m depth over 31 months under natural rain-fall conditions.The water migration within compacted loess was scrutinized based on rainfall,evaporation,and tem-perature data.Results indicate that atmospheric influence extends to a depth of 3.5 m.With the change of rainfall and evaporation,soil water content exhibits obvious peaks and troughs and annual trend.At 1.0 m depth,atmos-pheric influence is more pronounced.Soil moisture content shows slight fluctuations below 29 mm/d daily rainfall,followed by sharp increases beyond this threshold.Greater rainfall intensity and duration lead to deeper water migra-tion and infiltration,with a maximum depth observed between 6.0-7.0 m during the monitoring period.
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