Modeling the transportation of pollutants in shallow groundwater in the landfill site near a medium city
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Abstract:
Based on the results of field investigation and analyses of the water samples near an urban landfill site,the characteristics of groundwater pollution are discussed in this paper.A numerical model is built for the simulation of groundwater migration of pollutants.The fitting shows that the mathematical model is reasonable.By using the model to forecast the migration of COD_ cr and Cl,we get the results of those kinds of pollutants in the area.Keywords:
Groundwater Pollution
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Groundwater Contamination
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Bioaerosol
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In order to simulate the transport of leachate in groundwater and evaluate the impact of the Landfill's construction and operation on groundwater environment correctly,a landfill project of Shengze county in Wujiang,Jiangsu province was taken as an example.On the basis of hydrogeological conceptual model which is built on the generalization of hydrogeology features,a corresponding three dimensional coupling numerical model of groundwater seepage and solute transport was founded.The transport and diffusion of leachate were delineated through simulating and predicting the migration process of the leachate under different anti-seepage conditions.The results showed that the transport and diffusion of leachate is small and the impact on the groundwater environment is week,both in the case that anti-seepage conditions are intact and damaged.
Groundwater model
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Groundwater Pollution
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Groundwater pollution risk assessment in the groundwater source field (GSF) is crucial to ensure groundwater quality safety. A systematic method of assessing groundwater pollution in the GSF was established by combining the numerical models of groundwater flow and solute transport in the vadose zone and aquifer. It is featured by revealing the paramount fate of contaminant from the surface to receptor “well (wells)” via the pathway of vadose zone and aquifers. The method was verified in the phreatic and semi-confined aquifers of a vital GSF, Beijing-Tianjin-Hebei region (BTHR) in China. Nitrate was selected as the model pollutant. The results indicated that the groundwater pollution risk of the phreatic aquifer was dominated by the mediate level (45.27%), and that the second semi-confined aquifer was mainly ranked as relatively low (30.29%) and mediate (38.17%) levels. The groundwater pollution risk maps of the two aquifers were similar. The high and relatively high risk areas were affected by the high intensities of groundwater pollution sources (GPSIs) or short distances from the pollution sources to the pumping well. The low and relatively low risk areas were controlled by low GPSIs and adequate attenuation and denitrification of nitrate in the aquifer. The groundwater pollution risk in the semi-confined aquifer was lower than that in the phreatic aquifer. The groundwater pollution risk mapping provides a valuable scientific reference for the groundwater pollution prevention and control with the focus on the “pollution source” and “groundwater source field”. The proposed method can be further applied to the protections of the GSFs in the BTHR.
Phreatic
Groundwater Pollution
Groundwater model
MODFLOW
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