在多次变化的点源条件下对垂直切断墙的使用性能和设计方法的研究
Pengyuan Zhang1, Junrui Chai1, Jing Cao1
1State Key Laboratory of Water Engineering Ecology and Environment in Arid Area,Xi'an University of Technology, Xi'an 710048, China.
Journal of contaminant hydrology
|September 3, 2025
概括
这项研究模拟了垂直切断壁周围的污染物运输,发现释放时间和腐蚀显著影响墙壁的有效性. 污染源的接近也会影响度分布和分解时间.
科学领域:
- 环境工程
- 水文地质学
- 地质工程
背景情况:
- 垂直切断墙是污染现场的关键处置技术.
- 了解不和多孔介质中的污染物运输动态对于有效的现场整治至关重要.
研究的目的:
- 建立一个三维污染物运输模型,用于内部水库 - 垂直切断壁 - 外部水库系统.
- 分析各种参数对垂直切断壁的故障时间和有效性的影响.
主要方法:
- 模拟污染物运输的3D数值模型的开发.
- 污染物释放特征的分析 (有限脉冲,衰变).
- 研究多点源接近效应和污染物降解.
主要成果:
- 分解时间对释放时间 (tf ≤ 25 a) 和衰变系数 (λ < 0.04 1/a) 是敏感的.
- 多点源距离 (d ≤ 1.0 m) 会导致更强的合和单峰度.
- 切断壁的分解时间受到污染物的降解和半衰期 (t1/2_cw) 的显著影响.
结论:
- 垂直切断壁的性能高度依赖于污染源的特性和含水层状况.
- 水层中的污染物降解扩大了切断壁半衰期的敏感范围.
- 分解时间显示与分布系数 (kp_cw) 的线性关系以及与透系数 (ks_cw) 的反向线性关系.
- 提供了切断壁厚度和位置的设计指南,总结了全面的设计方法.
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