基于GMS的某石化企业地下水污染模拟

Simulation of Groundwater Pollution in a Petrochemical Enterprise Based on GMS

摘要:

选取山东省某石化企业为研究对象，运用GMS构建地下水流和溶质运移模型，模拟石化企业典型污染物在正常渗漏和采取防渗阻隔2种情况下的污染分布。结果表明：正常渗漏情况下，污染羽在水平方向上顺水流方向扩散，扩散范围随时间增大而扩大，在模拟时间9 500 d时，最大迁移距离为26.15 m。污染羽在垂向上受土层渗透性影响迁移缓慢，在模拟时间9 500 d时，底部黏土层浓度最大为0.074 mg/L。在污染源下游采取防渗墙阻隔后，污染羽横向迁移明显受限，在模拟时间9 500 d时，最大迁移距离为23.65 m。相比于正常渗漏，污染羽纵向迁移增强，设置阻隔墙后底部黏土层浓度明显增大，在第9 500 d时浓度达到最大，为0.152 mg/L。

Abstract:

A petrochemical enterprise in Shandong province has been selected as the research object. A model of groundwater flow and solute transport has been constructed by using GMS to simulate the pollution distribution of typical pollutants in petrochemical enterprises under normal seepage and seepage prevention. It is showed that the contaminated plume diffuses horizontally along with the flow direction under normal seepage condition. The diffusion range will expand with the increase of time, and the maximum migration distance is 26.15 m when the simulated time is 9500d. The contaminated plume migrates slowly in vertical direction due to the influence of soil permeability. The maximum concentration in the bottom clay layer is 0.074mg/L when the simulation time is 9500d. The transverse migration of pollution plume is obviously limited, but the vertical migration will increase when cut-off wall is adopted in the downstream of pollution source. The maximum migration distance is 23.65m when the simulation time is 9500d. Comparing with normal seepage, the longitudinal migration of the pollution plume will enhance. The concentration of the clay layer at the bottom will increases obviously after the barrier wall is set up. The concentration can reach 0.152mg/L, which is the maximum at 9500d.