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。
Abstract
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 rainfall conditions. The water migration within compacted loess was scrutinized based on rainfall, evaporation, and temperature 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, atmospheric 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 migration and infiltration, with a maximum depth observed between 6.0-7.0 m during the monitoring period.
关键词
黄土 /
高填方场地 /
含水率 /
降雨 /
水分迁移
Key words
loess /
deep filled ground /
moisture content /
rainfall /
water migration
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基金
陕西省秦创原“科学家+工程师”队伍建设项目(2022KXJ-086);陕西省重点研发计划项目(2023-YBSF-499);国家自然科学基金项目(42072302)
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