Yudao Chen
Guilin University of Technology
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Science in China Series D: Earth Sciences | 2000
Xueyu Zhu; Jianli Liu; Junjie Zhu; Yudao Chen
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.
BioMed Research International | 2016
Yaping Cheng; Yudao Chen; Yaping Jiang; Lingzhi Jiang; Liqun Sun; Liuyue Li; Junyu Huang
To provide more reasonable references for remedying underground water, fuel leak was simulated by establishing an experimental model of a porous-aquifer sand tank with the same size as that of the actual tank and by monitoring the underground water. In the tank, traditional gasoline and ethyl alcohol gasoline were poured. This study was conducted to achieve better understanding of the migration and distribution of benzene, toluene, ethyl benzene, and xylene (BTEX), which are major pollutants in the underground water. Experimental results showed that, compared with conventional gasoline, the content peak of BTEX in the mixture of ethyl alcohol gasoline appeared later; BTEX migrated along the water flow direction horizontally and presented different pollution halos; BTEX also exhibited the highest content level at 45 cm depth; however, its content declined at the 30 and 15 cm depths vertically because of the vertical dispersion effect; the rise of underground water level increased the BTEX content, and the attenuation of BTEX content in underground water was related to the biodegradation in the sand tank, which mainly included biodegradation with oxygen, nitrate, and sulfate.
IOP Conference Series: Earth and Environmental Science | 2018
Liqun Sun; Yudao Chen; Lingzhi Jiang; Yaping Cheng
The water level fluctuation of groundwater will affect the BTEX dissolution in the fuel leakage source zone. In order to study the effect, a leakage test of gasoline was performed in the sand-tank model in the laboratory, and the concentrations of BTEX along with water level were monitored over a long period. Combined with VISUAL MODFLOW software, RT3D module was used to simulate the concentrations of BTEX, and mass flux method was used to evaluate the effects of water level fluctuation on the BTEX dissolution. The results indicate that water level fluctuation can significantly increase the concentration of BTEX dissolved in the leakage source zone. The dissolved amount of BTEX can reach up to 2.4 times under the water level fluctuation condition. The method of numerical simulation combined with mass flux calculation can be used to evaluate the effect of water level fluctuation on BTEX dissolution.
Journal of Contaminant Hydrology | 2008
Yudao Chen; James F. Barker; Lai Gui
Chemical Geology | 2009
Yinian Zhu; Xuehong Zhang; Yudao Chen; Qinglin Xie; Junkang Lan; Meifang Qian; Na He
Journal of Hazardous Materials | 2005
Yinian Zhu; Xuehong Zhang; Qinglin Xie; Yudao Chen; Dunqiu Wang; Yanpeng Liang; Jie Lu
Environmental Earth Sciences | 2009
Yudao Chen; Lai Gui; James F. Barker; Yaping Jiang
Environmental Earth Sciences | 2013
Yudao Chen; Yaping Jiang; Yinian Zhu; Yuan Xia; Yaping Cheng; Yuequn Huang; Hanle Liu
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science | 2009
Yinian Zhu; Yudao Chen; Fei Long; Junkang Lan; Na He; Meifang Qian
Water Air and Soil Pollution | 2013
Yinian Zhu; Zongqiang Zhu; Yudao Chen; Feng Yang; Hui Qin; Liwei Xie