Water and contaminant transport in the vadose zone

1995 ◽  
pp. 165-191 ◽  
Author(s):  
Peter J. Wierenga ◽  
Mark L. Brusseau
Keyword(s):  
Contaminant Transport ◽  
Vadose Zone

The effect of subsurface military detonations on vadose zone hydraulic conductivity, contaminant transport and aquifer recharge

2013 ◽  
Vol 146 ◽  
pp. 8-15 ◽  
Author(s):  
Jeffrey Lewis ◽  
Jan Burman ◽  
Christina Edlund ◽  
Louise Simonsson ◽  
Rune Berglind ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Contaminant Transport ◽  
Vadose Zone ◽  
Aquifer Recharge

scholarly journals Modeling subsurface transport in extensive glaciofluvial and littoral sediments to remediate a municipal drinking water aquifer

2011 ◽  
Vol 8 (1) ◽  
pp. 1729-1764
Author(s):  
M. Bergvall ◽  
H. Grip ◽  
J. Sjöström ◽  
H. Laudon
Keyword(s):  
Drinking Water ◽  
Hydraulic Conductivity ◽  
Contaminant Transport ◽  
Vadose Zone ◽  
Transport Processes ◽  
Zone Model ◽  
Macropore Flow ◽  
Subsurface Transport ◽  
Littoral Sediments ◽  
Sandy Aquifers

Abstract. Few studies have been carried out that cover the entire transport process of pesticides, from application at the soil surface, through subsurface transport, to contamination of drinking water in esker aquifers. In formerly glaciated areas, such as Scandinavia, many of the most important groundwater resources are situated in glaciofluvial eskers. The purpose of the present study was to model and identify significant processes that govern subsurface transport of pesticides in extensive glaciofluvial and littoral sediments. To simulate the transport processes, we coupled a vadose zone model at the point scale to a regional groundwater flow model. The model was applied to a municipal drinking-water aquifer, contaminated with the pesticide-metabolite BAM (2,6-dichlorobenzoamide). A sensitivity analysis revealed that hydraulic conductivity and infiltration rate accounted for almost half of the model uncertainty. For a ten-meter-deep vadose zone of coarse texture, macropore flow was found to be of minor importance for contaminant transport. The calibrated model was applied to optimize the location of extraction wells for remediation, which were used to verify the predictive modeling. Running a worst-case scenario, the model showed that the establishment of two remediation wells would clean the aquifer in four years, compared to nine years without them. Further development of the model would require additional field measurements to assess the importance of macropore flow in deep, sandy aquifers. We also suggest that future research should focus on characterization of the variability of hydraulic conductivity and its effect on contaminant transport in eskers.

Sign in / Sign up

Export Citation Format

Share Document