Effect of Spatial Uncertainty of Unsaturated Zone Permeability Coefficient on Cl^- Migration

Abstract:

In order to study the effect of spatial uncertainty of soil parameter in unsaturated zone on contaminant migration, Permeability coefficient was chosen as a typical soil parameter to be researched. Bayesian method was used to deal with permeability coefficients and Monte-Carlo method was used to simulate spatial uncertainty of permeability coefficients. Numerical model of HYDRUS-1D was used to simulate the contaminant migration in the unsaturated zone taking spatial uncertainty of permeability coefficient into account. And Cl^-was chosen as the contamination. The result was that: The distribution of contamination concentration presented a significant uncertainty, and compared with the case of ignoring spatial uncertainty of permeability coefficients in unsaturated zone, it is closer to the actual situation. Meanwhile, a suggestion about the value of initial concentration in numerical simulation of groundwater is given combining the results.

• Periodical: Advanced Materials Research (Volumes 838-841)
• Pages: 995-1002
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.838-841.995
• Online since: November 2013
• Authors: Yue Ying Wang, Xiang Li*, Bei Dou Xi, Shun Guo Bai, Ming Xiao Li, Juan Li
• Keywords: Cl^- Migration, HYDRUS, Spatial Uncertainty, Unsaturated Zone

References

[1] Chunmiao Zheng，CordonD. Benneff. (translated by Jinyu Sun, Guoping Lu）. The migration of pollutants in the groundwater simulation (second edition) [M]. Beijing：Higher Education Press. (In Chinese).

[2] Shaolong Li, Jiafa Zhang, Wei Zhang, Li Xiao. Research of permeability coefficient spatial variability and stochastic simulation in top soil[J]. Rock and Soil Mechanics, 2009, 10(30): 3168-3172. (iIn Chinese).

[3] Smith J L. Spatial variability of flow parameters in stratified sand[J]. Mathematical Geology, 1981, 13(1): 1~21.

[4] Mallants, Dirk, Mohanty, Binayak P., Jacques, Diederik, Feyen, Jan. Spatial Variability of Hydraulic Properties in A Multi-Layered Soil Profile[J]. Soil Science, March 1996 - Volume 161- Issue 3 - pp.167-181.

DOI: 10.1097/00010694-199603000-00003

[5] Xiaoqing Shi, Jichun Wu, Yongsheng Yuan. Research of permeability coefficient spatial variability[J].  Advances in Water Science, 2005, 2(16): 210-214. (In Chinese).

[6] Jie Liang, Guangming Zeng, Senglian Guo, Anlei Wei. Effect of heterogeneity of permeability coefficient on groundwater solute transport[J]. Journal of Hydraulic Engineering, 2008, 39(8), 900-905. (In Chinese).

[7] Wei Peng, Jianfeng Wu, Tingting Yan. Uncertainty about the impact of conditional Simulation of permeability coefficient on groundwater solute transport[J]. Journal of Nanjing University(natural science edition), 2008, 44(3), 280-287. (In Chinese).

[8] Tingting Yan, Jianfeng Wu. Research about effect of permeability coefficient spatial variability on solute transport[J]. Advances in Water Science, 2006, 1(17), 29-35. (In Chinese).

[9] Yun Zhang, Sheng Zhang, Changli Liu, Hongbing Hou, Hua Dong, Ming Zhang. Review and prospect about protective capability of vadose soil to nitrogen pollution[J]. Journal of Agro-Environment Science, 2006, 25(Supplement): 339-346. (In Chinese).

[10] Xianmin Liu, Xianguo Wang. Preliminary study about contaminant self-purification law of Luoyang aeration zone[J]. Groundwater, 2009, 31(5): 79-82. (In Chinese).

[11] Wenguang Zhang, Lingyao Liu. Extended Bayes method to confirm parameters of random variable probability distribution[J]. Journal of geotechnical engineering, 1995, 3(17): 91-94. (In Chinese).

[12] Jingwei Bi, Jiabao Zhang, Xiaomin Chen, Anning Zhu, Jie Feng. Simulation of farmland soil water leakage and Nitrate leaching by HYDRUS-1D model[J]. Rural Ecological Environment, 2004, 20(2): 28-32. (In Chinese).

[13] Fanghua Hao, Wen Sun, Ayan Zeng, Peng Li, Jiaxun Zhang. Simulation of nitrogen migration under different irrigating situations at irrigation area in Hetao by HYDRUS-1D[J]. Journal of Environmental Science, 2008, 28(5): 853-858. (In Chinese).

[14] Huan Ma, Dawen Yang, Huimin Lei, Jianfeng Cai, Zheye Nantian. Application and improvement of Hydrus-1D model used to analysis the Water cycle rules in the field[J]. Journal of Agricultural Engineering, 2011, 27(3): 6-11. (In Chinese).

[15] Jiangli Meng, Xinguang Dong, Jinlong Zhou, Jinli Li. Application of HYDRUS medle to relation between irrigation in arid areas and soil salinization[J]. Journal of xinjiang agricultural university, 2004, 27(1): 45-49. (In Chinese).