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首页> 外文期刊>International Journal of Soil, Sediment and Water >BIOSCREEN, AT123D and MODFLOW/MT3D a Comprehensive Review of Model Results
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BIOSCREEN, AT123D and MODFLOW/MT3D a Comprehensive Review of Model Results

机译：BIOSCREEN，AT123D和MODFLOW / MT3D对模型结果的全面审查

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摘要

The Domenico equation is commonly used to evaluate long term risks associated with contaminated groundwater. Numerous groundwater models are based on it, including BIOSCREEN and BIOCHLOR. This paper compares the results from BIOSCREEN, AT123D and MODFLOW/MT3D groundwater models. Results from the AT123D and MODFLOW/MT3D models indicate that BIOSCREEN significantly under estimates contaminant mobility and thus exposure risks. This was unexpected as BIOSCREEN results are commonly assumed to be extremely conservative. In fact BIOSCREEN did produce the highest downgradient concentrations; however it took unreasonable long periods of time to achieve them. Such lengthy time periods are not typically evaluated as part of a risk evaluation. Even more surprisingly BIOSCREEN produced the same peak concentration for all contaminants and for all aquifer types tested. Both contaminant concentration and travel times from AT123D and MODFLOW/MT3D models were almost identical. Furthermore these results varied with contaminants and aquifer properties as expected. The influence of biodegradation was also evaluated. Inclusion of conservative biodegradation rates made BIOSCREEN the least conservative model by far. This is because the lengthy travel times produced by BIOSCREEN provide a longer period of time over which biodegradation works.
机译：Domenico方程通常用于评估与受污染的地下水相关的长期风险。基于它的许多地下水模型，包括BIOSCREEN和BIOCHLOR。本文比较了BIOSCREEN，AT123D和MODFLOW / MT3D地下水模型的结果。 AT123D和MODFLOW / MT3D模型的结果表明BIOSCREEN大大低于估计的污染物迁移率，因此存在暴露风险。这是出乎意料的，因为通常认为BIOSCREEN结果非常保守。实际上，BIOSCREEN确实产生了最高的降级浓度。但是，实现它们花费了不合理的长时间。此类漫长的时间段通常不作为风险评估的一部分进行评估。更令人惊讶的是，BIOSCREEN对所有污染物和所测试的所有含水层类型都产生了相同的峰值浓度。 AT123D和MODFLOW / MT3D模型的污染物浓度和传播时间几乎相同。此外，这些结果随污染物和含水层性质的变化而变化。还评估了生物降解的影响。包括保守生物降解率在内，BIOSCREEN迄今为止是最不保守的模型。这是因为BIOSCREEN产生的漫长旅行时间为生物降解提供了更长的时间。

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