随着时间的增加，砂柱中的饱和度剖面逐渐接近于稳定时的饱和度剖面，对应于粗砂的土壤水分特征曲线。
As time progresses, the water saturation profile becomes closer to the steady-state profile, which corresponds to the soil-water characteristic curve of the coarse sand.
随着时间的增加，砂柱中的饱和度剖面逐渐接近于稳定时的饱和度剖面，对应于粗砂的土壤水分特征曲线。
As time progresses, the water saturation profile becomes closer to the steady-state profile, which corresponds to the soil-water characteristic curve of the coarse sand.
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