在不和土壤中分析液体-蒸汽混合迁移机制,基于温度对土壤微观结构的影响
1Highway Academy, Chang'an University, Xian, 7100000, People's Republic of China.
Scientific reports
|November 23, 2023
概括
昼间温度周期导致水分在土壤中迁移,在粘土层的顶部积聚,并在沙层增加孔隙吸收. 这种潮湿运动改变了土壤的微观结构,影响了进一步的迁移.
科学领域:
- 地质技术工程 地质技术工程
- 土壤物理 土壤物理
- 环境科学 环境科学
背景情况:
- 不和土壤中的水分迁移受温度和土壤微观结构的影响.
- 对于基础设施的稳定性来说,了解白天周期下的地下土壤水分动态至关重要.
研究的目的:
- 为了研究在白天温度周期下的下层土壤中湿度增加的机制.
- 分析热效应,土壤微观结构和水分迁移之间的关系.
主要方法:
- 在粘土和沙土上进行液体蒸汽混合迁移试验.
- 利用环境扫描电子显微镜 (ESEM) 和粒子 (孔) 和裂分析系统 (PACS) 进行微观结构分析.
- 进行了矩阵吸收测试,并分析了土壤-水特性曲线 (SWCC).
主要成果:
- 在这两种土壤类型中观察到"每日水蒸气迁移周期",导致顶层水分积累.
- 在泥土的粘土中,由蒸汽压力驱动的上升湿度迁移改变了微观结构,降低了上层的孔积.
- 在沙子中,由重力驱动的向下迁移增加了上层的孔隙吸收,增强了夜间迁移.
结论:
- 昼间温度周期在不和土壤中诱导复杂的水分迁移模式.
- 土壤微观结构在响应水分再分配时动态变化,产生反循环.
- 了解这些微观结构变化是预测和管理地下土壤水分含量的关键.
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