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Characteristics of distribution and transport of petroleum contaminants in fracture-karst water in Zibo Area, Shandong Province, China

引用

Science China Earth Sciences 2000年第2期43卷 141-150页

作者：朱学愚刘建立朱俊杰陈余道 Department of Earth Sciences Nanjing University Nanjing China Department of Chemisty Nanjing University Nanjing China Department of Construction Engineering Guilin Institute of Technology Guilin China

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.

关键词： fracture-karst water petroleum contaminants tracing test benzene curve of concentration versus time spatial distribution.

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