石油类污染物在包气带中的迁移预测——以兰州西固商业石油储备库为例

Prediction of the Migration of Oil Pollutants in Vadose Zone——A Case Study of Commercial OilReserve Base in Xigu,Lanzhou

包气带在地表石油类污染物下渗到地下水的过程中扮演着重要角色,同时包气带受到污染必然会对周围环境,特别是植物的生长造成影响,从而影响人类自身。主要使用HYDRUS软件预测了兰州西固商业石油储备库的渗漏对包气带的影响,分正常工作状况和非正常工作状况两种情况。在正常工作状况下,从5000天到10000天,污染物浓度呈线性增加,到50年左右,包气带底部(下边界)污染物浓度接近0.1mg/cm3。在非正常工作状况下,包气带底部(下边界)浓度增加的速度要远远大于正常工作状况,到50年左右,包气带底部(下边界)浓度达0.5mg/cm3。预测结果可以为相应工作状况下饱和带的溶质迁移模型提供参考依据,对确定饱和带污染物的浓度具有重要的参考意义。

Vadose zone which plays an important role in the process of infiltration of surface oil pollutants into the groundwater is bound to affecting surrounding environment, especially the growth of plants, thus human being. By using HYDRUS software, the effect of the leakage of vadose zone caused by commercial oil reserve base in Xigu, Lanzhou in the case of normal working condition and non-normal condition was predicted. In normal working condition, at the bottom of vadose zone, the concentration of pollutant was linear increasing between 5,000 days and 10,000 days, and reached 0.1mg/cm^3 at 50 years. In non-normal working condition, at the bottom of vadose zone, the concentration of pollutant increased far more than normal case, and reached 0.5mg/cm^3 at 50 years. Results can serve as referential information for solute transport model in the saturated zone under correspondingly practical condition and is of great significance to the determination of concentration of pollutants in the saturated zone.