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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NITRATE TRANSPORT CHARACTERISTICS IN THE GROUNDWATER WITH PREFERENTIAL FLOW

Jinqiao Wu
Sun Yat-Sen University, No. 132 Waihuan Dong Road, Guangzhou, 510006, China

Jing Ding
Sun Yat-sen University, 132 Waihuan Dong Rd. Panyu District, Guangzhou 510006, China

Jianfeng Lu
Sun Yat-Sen University, No. 132 Waihuan Dong Road, Guangzhou, 510006, China

Weilong Wang
Sun Yat-sen University, 132 Waihuan Dong Rd. Panyu District, Guangzhou 510006, China

Abstract

Nitrate can be widely used in solar thermal power and other industrial engineering. If nitrate is leaked and cannot be timely recovered, it will probably dissolve in the water and transport into the soil and groundwater, and then it will be a serious environmental problem. In this paper, the unsteady diffusion performances of nitrate in the soil and groundwater were numerically investigated by HYDRUS in order to evaluate the environment pollution of leaked nitrate. In the simulation model, the soil system is a homogeneous porous system with a vertical preferential flow pathway in the upper center region, and the local precipitation with nitrate infiltrated from the upper boundary open to atmosphere. The nitrate concentration distribution is further analyzed by considering the effects of the pathway length, pathway width and pathway set location. The simulation results showed that the horizontal nitrate diffusion range was rarely affected by these three pathway variables, while the vertical diffusion range was seriously impacted by the preferential flow. Because the nitrate diffused more quickly in the preferential flow pathway, the diffusion region near pathway will totally expand downward. As the pathway length enlarged, the nitrate diffusion region especially the region around the pathway will be deeper. As the pathway width increased, the nitrate diffusion region affected by preferential flow also became wider. As the pathway depth increased, the nitrate diffusion region affected by preferential flow became less, so the preferential flow has more obvious effected on nitrate migration in the unsaturated layer than the saturated one.

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