气候驱动的水文极端会增加石油碳化合物的地下流动性:在半大陆气候条件下的实验研究
Amélie Cavelan1, Fabrice Golfier2, Catherine Lorgeoux2
1Université de Lorraine, CNRS, LIEC, F-54000, Nancy, France; BRGM, F- 45000, Orléans, France.
The Science of the total environment
|November 26, 2025
概括
极端的地下水波动显著增加轻非水相液体 (LNAPLs) 的释放和挥发,但也增强了自然衰减. 这影响了污染土壤的长期环境风险和管理策略.
科学领域:
- 环境科学 环境科学
- 水文地质学 水文地质学
- 土壤科学 土壤科学
背景情况:
- 地下水平面的波动影响土壤中轻非水相液体 (LNAPLs) 的命运.
- 这些波动的强度及其对LNAPL行为的影响,特别是在气候变化下,人们对这些波动的强度和影响知之甚少.
- 现有的LNAPL管理策略可能会因气候变化而改变的环境风险而受到挑战.
研究的目的:
- 量化地下水位波动强度对LNAPL命运和沙土再分配的影响.
- 在2100年预测的极端气候变化场景下模拟和评估LNAPL行为.
- 为改进LNAPL污染场所的环境风险评估和管理策略提供数据.
主要方法:
- 使用大型 lysimetric 柱 (2 m3) 监测土壤水分,重量,pH 和氧化还原潜力.
- 控制的极端降雨和地下水位波动模拟了IPCC预测的气候变化影响.
- 分子分析 (GC-TQD,micro-GC) 量化了自由,气态和溶解的LNAPL相.
主要成果:
- 极端波动使LNAPL涂抹区厚度增加了50%,自由LNAPL耗尽增加了30%.
- 在极端条件下,BTEX挥发率上升了2.8倍,溶解的LNAPL度增加了25%.
- 与当前条件相比,自然减弱率高出50% (37.5g/m2/day).
结论:
- 地下水位波动的强度是推动LNAPL在沙性土壤中的再分配的关键因素.
- 极端波动增强短期LNAPL释放,但矛盾的是,减少其长期持久性.
- 调查结果强调需要将气候变化驱动的水文变化纳入LNAPL风险评估和补救计划.
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