Characteristics of distribution and transport of petroleum contaminants in fracture-karst water in Zibo Area, Shandong Province, China |
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Authors: | ZHU Xueyu LIU Jianli ZHU Junjie CHEN Yudao |
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Institution: | 1. Department of Earth Sciences,Nanjing University,Nanjing 210093,China 2. Department of Chemisty,Nanjing University,Nanjing 210093,China 3. Department of Construction Engineering,Guilin Institute of Technology,Guilin 541004,China |
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Abstract: | Fracture-karst water is an important water resource for the water supply in North China. Petroleum contamination is one of
the most problematic types of the groundwater pollution. The characteristics of distribution and transport of the petroleum
contaminants in fracture-karst water are different from those in porous water. The flow velocity of fracture-karst water is
much faster than the velocity of porous water on an average. Therefore, contaminant transport in fracture-karst water is an
absolute advection-dominated problem. The plume of the petroleum contamination may extend to several kilometers from pollution
sources. It was not caused by the oil pool floating on the water table but by the oil components dissolved and scattered in
groundwater. The distribution of the petroleum contaminants over space are concentrated in the strong conductive zone on the
plane. On the vertical section the highest concentration of the oil contaminants appeared in the strata where the contamination
sources were located. The concentrations of the oil contaminants in wells changed greatly over time. Therefore, the curves
of concentration versus time fluctuated greatly. The reasons are as follows. (a) Fracture-karst water has a very great velocity.
(b) Local flow fields which were caused by pumping and stoppage in some wells changed frequently. (c) In fracture-karst aquifer
the transport channels are complicated. (d) Residual oil in vadose zone was leached after rainfall. It is of great practical
value for the control and remediation of petroleum contamination in fracture-karst aquifer to understand those characteristics. |
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Keywords: | fracture-karst water petroleum contaminants tracing test benzene curve of concentration versus time spatial distribution |
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