| DOI: | 10.2172/1037767
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| 报告号: | SRNL-STI-2012-00131
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| 报告题名: | MODELING TRITIUM TRANSPORT, DEPOSITION AND RE-EMISSION |
| 作者: | Viner, B.
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| 出版年: | 2012
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| 发表日期: | 2012-04-03
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| 国家: | 美国
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| 语种: | 英语
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| 中文主题词: | 植被
; 扩散
; 速度
|
| 主题词: | VEGETATION
; DIFFUSION
; VELOCITY
|
| 英文摘要: | The atmospheric release of tritium oxide (HTO) potentially impacts human health, typically through inhalation or absorption. Due to HTO's similarity to water, vegetation will absorb HTO by solution in the leaf water and then re-emit it, creating a number of secondary sources of HTO. Currently, models used for emergency response at Savannah River Site incorporate the transport and deposition of HTO but do not provide estimates for its potential re-emission from vegetation or soil surface though re-emission could result in prolonged exposure and greater than predicted dose for an individual downwind. A simple model of HTO transport, deposition and re-emission has been developed to examine the potential increase in exposure and dose. The model simulates an initial release of HTO that moves with a mean wind and expands through diffusion as a Gaussian puff. Deposition is modeled using previous estimates of deposition velocity for HTO and re-emission is modeled using a time constant that describes how quickly HTO is transferred between the surface and atmosphere. Additional puffs are created to simulate re-emission of HTO as well as horizontal diffusion across model grid cells. An evaluation of field data indicates that the use of a re-emission module tends to improve model predictions through improved prediction of peak concentration magnitude and location. When considering dose, nearly all of the released material is included in the dose calculation when re-emission is included. Although exposure to HTO through re-emission occurs over a few hours, the incremental increase in dose is relatively small because the atmospheric concentration of re-emitted HTO is much lower than the initial release. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1037767
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40699
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1037767.pdf（634KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Viner, B.. MODELING TRITIUM TRANSPORT, DEPOSITION AND RE-EMISSION. 2012-01-01.
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