Abstract:This paper presents the results of laboratory investigation and simulation of diesel infiltration in unsaturated zone. A series of one-dimensional column experiments were conducted to study the infiltration and residue characteristics of diesel in sandy soils under varied soil moistures and media sizes. Then, Hydrocarbon Spill Screening Model (HSSM) was used to simulate the infiltration processes of diesel in medium sand with soil moisture equals to 6%. The results indicated that as soil moisture grew, the migration velocity of soil wetting front first increased and then decreased, and the fastest migration velocity corresponded to 40%~50% of maximum residue moisture content. Negative correlation was found between the amount of residual diesel and soil moisture content. In fine, medium and coarse sand, the average migration velocity of soil wetting front were 0.42, 0.52, 0.73cm/min, and the average amount of residual diesel were 98.10, 68.70, 48.79mL, respectively. The migration velocity of soil wetting front and the amount of residual diesel were negatively correlated with media size. Fitted migration velocity by HSSM of soil wetting front in medium sand with moisture content equals to 6% was 0.5832cm/min, while the experimental value was 0.5689cm/min. The relative percentage error between fitted value and the experimental value was 2.51%. HSSM can accurately simulate the infiltration process of diesel oil in the unsaturated zone, and has great significance to soil and groundwater pollution forecast.
宋兴龙, 赵勇胜, 李璐璐, 秦传玉, 杜鹏程. 非饱和带柴油入渗实验研究及HSSM模拟[J]. 中国环境科学, 2014, 34(7): 1818-1823.
SONG Xing-Long, ZHAO Yong-Sheng, LI Lu-Lu, QIN Chuan-Yu, DU Peng-Cheng. Experimental study and HSSM simulation of diesel infiltration in unsaturated zone. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1818-1823.