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以平行于来流方向和垂直于来流方向建造的平地型铀尾库为研究对象,采用计算流体力学软件Fluent对氡大气扩散进行数模拟,研究了风速为0.5 m/s时滩面植被覆盖对铀尾矿库下风向氡的迁移规律和浓度分布的影响,并对比分析了两种建造方向对氡扩范围的影响。结果表明,随铀尾矿库下风向距离和植被覆盖面积加,铀尾矿库下风向的氡浓度不断下降。植被覆盖面积相同时,建方向平行于来流的铀尾矿库下风向的局部氡浓度明显高于建造方垂直于来流的,并且氡污染距离较远。建造方向一定时,随植被覆面积增大,局部氡浓度不断增加,但随距离增加,氡污染程度不断弱。
Taking the planar uranium tail bank constructed parallel to the incoming flow direction and perpendicular to the incoming flow as the research object, the computational fluid dynamics software Fluent was used to simulate the radon atmospheric diffusion. The effects of vegetation cover on the beach surface at a wind speed of 0.5 m / s On the rule of the radon migration and concentration distribution under the uranium tailings dam, and analyzes the influence of two construction directions on the radon expansion range. The results show that the radon concentration in the wind direction under the uranium tailings bank declines with the wind direction distance and the vegetation coverage area under the uranium tailings dam. When the vegetation coverage is the same, the local radon concentration in the wind direction under the uranium tailings bank parallel to the incoming flow is obviously higher than that of the construction side perpendicular to the incoming flow, and the radon pollution distance is far. With a certain direction of construction, with the increase of vegetation cover area, the local radon concentration continuously increases, but with the increase of distance, the degree of radon pollution is constantly weak.