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	Selection of dispersivity in groundwater risk assessment
	Wu Xiaofeng ; Tang Jie
	2010-05-11 ; 2010-05-11
关键词	Theoretical or Mathematical/ environmental degradation groundwater risk management water pollution measurement/ groundwater risk assessment Domenico model ASTM E 1739 Tier 2 risk assessment chlorinated organic solvents groundwater sites potential contaminant concentration groundwater down-gradient dispersivity parameters constant longitudinal dispersivity scale effect risk calculation natural attenuation factor groundwater velocity degradation rate/ A8670E Water (environmental science) A9240Q Water quality and water resources A8670L Measurement techniques and instrumentation in environmental science A9240K Groundwater
中文摘要	The Domenico model is used in combination with ASTM E 1739 in a Tier 2 risk assessment of chlorinated organic solvents contaminated groundwater sites to predict potential contaminant concentration in groundwater down-gradient from the point of exposure (POE). A knowledge of the dispersivity parameters is necessary for carrying out this calculation. A constant longitudinal dispersivity of 10 m is often used in analytical and numerical calculation. However, because of the scale effect of dispersion, two other main approaches are currently often used. From the viewpoint of conservative principle in risk assessment, it is necessary to determine which dispersivity data will give a higher predicted concentration, corresponding to a more conservative risk calculation. Generally, it is considered that a smaller dispersivity leads to a higher predicted concentration. This assumption is correct when dispersion is the only natural attenuation factor. However, degradation of commonly encountered chlorinated organic solvents in environment under natural condition has been widely reported. Calculations given in this paper of several representative cases show that a general consideration of the influence of dispersivity on concentration prediction is not always correct when a degradation term is included in the calculation. To give a conservative risk calculation, the scale effect of dispersion is considered. Calculations also show that the dispersivity parameters need to be determined by considering the POE distance from the source, the groundwater velocity, and the degradation rate of the contaminant.
语种	英语 ; 英语
出版者	Editorial Board of J. of Tsinghua University ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/27446]
专题	清华大学
推荐引用方式 GB/T 7714	Wu Xiaofeng,Tang Jie. Selection of dispersivity in groundwater risk assessment[J],2010, 2010.
APA	Wu Xiaofeng,&Tang Jie.(2010).Selection of dispersivity in groundwater risk assessment..
MLA	Wu Xiaofeng,et al."Selection of dispersivity in groundwater risk assessment".(2010).

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