Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/645098 |
| 报告编号 | UCRL-CR--129075 |
| 来源ID | OSTI_ID: 645098 |
| Development of a computer model for calculation of radioactive materials into the atmosphere after an accident | |
| Schershakov, V. [Federal Information Analytical Centre, Obinski (Russia)] | |
| 英文摘要 | Secondary atmospheric contamination with radioactive dust and chemical species deposited on the ground and resuspended by wind occur very widely. This process is particularly pronounced in case of extensive contamination of soil and under extreme weather conditions, for example, during dust storms. The mechanism of wind dust generation consists in the following. At low wind speed U=2-3 m/s, which is most common in midlatitude, small radioactive dust particles (diameter of hundredth of a micron to 10-20 microns) are lifted from soil surface due to turbulent vortexes. Under the gravitational force the particles of 1-2 micron diameter practically do not settle. Larger dust particles cannot remain in the air for a long time: they are lifted by turbulent vortexes and settle, their motion in the wind flow is jump-wise and the interaction of particles with the flow is called saltation /I/. Saltation is the main mechanism of dust generation up to the wind velocity at which wind erosion starts. The size of dust particles can be as large as 100 pm. When dropping they can be ricocheting from ground or pass the impulse to other particles which begin rolling over and jumping up. The process of dust transport by wind can be compared to a chain reaction. At the velocity of 10 m/s large particles of about 500 pm stop skipping and roll over only, while particles of more than 1 mm remain stationary. Thus, the fine fraction is blown out from the polydispersed soil particles. The intensity of wind resuspension of radioactive dust from the ground is characterized either by a resuspension factor or a resuspension rate. |
| 出版年 | 1997 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 54 ENVIRONMENTAL SCIENCES ; 05 NUCLEAR FUELS ; PARTICLES ; PARTICLE KINEMATICS ; PARTICLE RESUSPENSION ; RADIOACTIVE AEROSOLS ; PARTICLE SIZE ; RADIOACTIVE CLOUDS ; MATHEMATICAL MODELS |
| URL | http://www.osti.gov/scitech/servlets/purl/645098 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/267349 |
| 推荐引用方式 GB/T 7714 | Schershakov, V. [Federal Information Analytical Centre, Obinski . Development of a computer model for calculation of radioactive materials into the atmosphere after an accident,1997. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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