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Application of Visual MODFLOW to assess the Sewage
Plant accident pool leakage impact on groundwater in the Guanting
Reservoir area of Beijing |
| Weifang SHI,Weihua ZENG,Bin CHEN, |
| State Key Laboratory
of Water Environment Simulation, School of Environment, Beijing Normal
University, Beijing 100875, China; |
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Abstract In this paper, Visual MODFLOW is used to simulate groundwater flow and transport within the study area based on a certain scenario, assessing the leakage impact of a Sewage Plant accidental pool on groundwater using NH3-N as the assessment factor. In the model constructed, soil absorption and degradation was taken into account; the adsorption process of NH3-N adopted the Langmuir equation and the degradation was simplified as a first-order dynamic reaction. The leakage process was defined as a recharge with contaminants in the case that where there are two accidents happening to the Sewage Plant within a one month interval. The result of the model indicated that the NH3-N concentration of groundwater increased sharply when the Sewage Plant was malfunctioning. The peak of NH3-N concentration under the accident pool was about 8.0 × 10−5 mg/L at the first accident. When the second accident happened, the NH3-N concentration increased to a maximum of about 1.1 × 10−4mg/L. At a location of about 20 m from the accident pool, the concentration declined to about one sixth of the center, which demonstrated that the NH3-N concentration increase caused by leakage of the accident pool was little, and the spatial influence also was small. The paper provides a method of dealing with the transport of physically and chemically reactive substances in groundwater with Visual MODFLOW and assessing the Sewage Plant accident pool leakage impact on groundwater quantitatively.
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| Keywords
groundwater
leakage
Visual MODFLOW
adsorption
dynamic reaction
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Issue Date: 05 September 2010
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