基于T2VOC对比分析LNAPL多种因素运移的数值模拟

Numerical simulation of LNAPL multi-factor migration based on T2VOC comparative analysis

本文采用TOUGH2软件对LNAPL进行数值模拟,选取地下水流速率、LNAPL的泄漏强度、地下水位波动等影响因素,对比分析上述几种因素对LNAPL溶解速率的变化及其敏感度,为LNAPL的溶解迁移模拟提供源强依据。结果显示NAPL相饱和度对研究溶解速率变化起关键作用;影响LNAPL溶解速率变化因素:地下水流速率对溶解速率的敏感度最大,其次为地下水位波动的敏感度,泄露速率的敏感度最小。因此,对于地下水流速率较快与经常造成地下水位上升的污染源区,应当格外注意扩大液相的监测,对于渗透速率较快的污染源区,应当注意排查LNAPL的NAPL相。

TOUGH2 software was used to conduct numerical simulation of LNAPL.The impacts and sensitivities of groundwater flow rate,LNAPL leakage intensity and groundwater level fluctuation on the dissolution rate of LNAPL were compared and analyzed,so as to provide the basis of source strength for the simulation of LNAPL dissolution and migration.The results of simulation show that NAPL phase saturation plays a key role in the dissolution rate.The factors affecting the dissolution rate of LNAPL are as follows:the sensitivity of groundwater flow rate to dissolution rate is the highest,followed by the sensitivity of groundwater level fluctuation,and the sensitivity of leakage rate is the lowest.Therefore,special attention should be paid to expand the monitoring of liquid phase for the pollution source areas with fast groundwater flow rate and frequent rise of groundwater level.For the pollution source areas with fast penetration rate,attention should be paid to investigate the NAPL phase of LNAPL.