Simulation of tracer transportation under the leak of vertical flexible barrier system
ZHAO Yang1,2, LEI Guo-yuan1, XU Ya2, LIU Yu-qiang2, DONG Lu2, LIU Jing-cai2, HUANG Qi-fei2
1. Industrial Safety Engineering Technology Research Center of Hubei Province, Wuhan University of Science and Technology, Wuhan 430081, China; 2. State Key Laboratory of Environment Benchmarks and Risk Assessment and Research Institute of Solid Waste Management, Chinese Research Academy of Environment Sciences, Beijing 100012, China
Abstract：In order to study the feasibility, sensitivity and influencing factors of pumping-tracer joint detection of vertical flexible pollution barrier (VFBS) leakage, a corresponding conceptual model was constructed. The Equivalent Hydraulic Conductivity (EHC) method was used to couple wellbore-aquifer flow, on this basis the multi-physics simulation numerical model was used to simulate the breakthrough process and law of the tracer passing through the VFBS defect under artificial hydraulic induction. The results showed that under pumping induction, an artificial hydraulic pressure difference is formed on both sides of the VFBS to accelerate the speed of the tracer passing through the leakage. But overall, the tracer passing through the leakage was still a very small part, most of the tracer is distributed around the injection well. Under typical conditions (leakage depth 2.2m, size 0.5m, injection concentration 1000μg/L and flow rate 1L/h), the tracer was detected in opposite monitoring well on the 4th day and reached the peak on the 5th day. The deeper the leakage depth was, the peak concentration was lower and the detection time was longer. The tracer was not detected above 4m depth on the opposite side under typical conditions. Taking the 4m leakage depth under typical conditions as an example, With the deviation of the horizontal position of leakage, peak concentration was reduced, When the deviation was 4m, and the tracer was not detected on the opposite side; The greater the injected concentration was, the peak concentration was higher, but the peak time was unchanged, when the concentration was less than 2000μg/L, the tracer was not detected; The larger the hole size was, peak concentration was greater and reached on the 6th day, but all not detected. The side length of the leakage was predicted to be at least when it was 1.07m, the tracer was detected on the opposite side under typical conditions. In general, it is sorted according to the size of the impact on the tracer breakthrough process:horizontal offset distance > leakage depth > leakage size > injected concentration.
赵阳, 雷国元, 徐亚, 刘玉强, 董路, 刘景财, 黄启飞. 垂直防渗帷幕渗漏条件下示踪剂迁移模拟[J]. 中国环境科学, 2020, 40(7): 2985-2994.
ZHAO Yang, LEI Guo-yuan, XU Ya, LIU Yu-qiang, DONG Lu, LIU Jing-cai, HUANG Qi-fei. Simulation of tracer transportation under the leak of vertical flexible barrier system. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2985-2994.
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