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Outline
In the numerical simulation of atmospheric diffusion of pollutants characterized by radon, the default values of wet deposition parameters are generally adopted, which leads to the uncertainty of calculation accuracy. In order to determine the influence factors and characteristic values of radon wet deposition parameters, a self-developed experimental device was used to simulate the precipitation process, and the response relationship between initial radon activity concentration, precipitation intensity, precipitation pH and radon wet deposition rate and removal efficiency was comprehensively analyzed. The results show that the wet deposition rate of radon in atmospheric environment is linearly correlated with the initial radon activity concentration and precipitation intensity (R2>0.99), while the removal efficiency is weakly correlated with the initial radon activity concentration and pH value. Therefore, taking gaseous radon as a typical object, when the wet sedimentation rate is in the range of 31~2 653 Bq/(m2·h), it can be predicted that the removal efficiency of radon will remain at 0.55%~0.65%. The relationship between the final precipitation intensity and wet deposition parameters follows exponential function. The conclusion can provide parameter basis for numerical simulation of atmospheric diffusion of radon.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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