三峡库区地下水双酚A运移数值模拟

双酚A（BPA）是一种能够对人类及动物产生重大威胁的环境雌激素。以BPA为目标污染物，以三峡库区重庆市茶园新区为例，利用VSAFT2软件建立地下水水质模型并分析库水位变化、地层非均质条件和土壤吸附作用因素对BPA在地下水环境中运移规律的影响。研究中通过假设茶园新区渗透系数分布特点，以变异系数为非均质划分标准，模拟了变异系数分别为0.237、0.529和0.748条件下，BPA在地下水中的运移过程。结果表明：BPA运移速率和运移量随水头边界值的增加而增加，运移能力与地下水水力梯度值呈现正相关；非均质性越强，BPA运移速度越慢；土壤吸附作用在一定程度上会阻滞BPA在地下水的运移过程，对流与弥散均发生延迟；经参数敏感度分析，饱和渗透系数对模拟结果的影响较大。

Numerical simulation of bisphenol A transport in groundwater in the Three Gorges Reservoir area

Bisphenol A (BPA), an environmental estrogen, poses a major threat to humans and animals. A hydrogeological model of Chayuan New District in Chongqing was established to estimate the migration mechanism of BPA under the time-varying boundary. Further, aquifer heterogeneity and adsorption were also investigated. Besides, the migration of BPA in groundwater was simulated under the condition that the coefficients of variation were 0.237, 0.529, and 0.748, respectively. The results show that the migration rate and quantity of BPA are proportional to the boundary water head, and the migration capacity is positively correlated with the groundwater hydraulic gradient. The analysis shows that the intensity of heterogeneity is inversely proportional to the BPA migration rate. Soil adsorption can block the transport of BPA in groundwater, resulting in delayed convection and dispersion. Finally, a sensitivity analysis of the saturated permeability coefficient (Ks) was carried out, demonstrating Ks has a significant effect in the estimation.