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| Analysis of simulated migration of atrazine in a type of loamy sand based on two adsorption models |
| Received:June 24, 2019 |
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| KeyWord:atrazine;adsorption;desorption;HYDRUS-1D;simulation |
| Author Name | Affiliation | E-mail | | LI Xiao-yu | College of Architectural and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing 100124, China | | | REN Zhong-yu | College of Architectural and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing 100124, China | | | LI Fang-chun | China National Knowledge Infrastructure, Beijing 100192, China | | | JING Qi | College of Architectural and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing 100124, China | jingqi@bjut.edu.cn | | WEI Ming-hai | Chinese Academy of Environmental Planning, Beijing 100012, China | |
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| Abstract: |
| To better understand the migration of atrazine in soil and provide foundations for groundwater pollution prevention, a one-dimensional soil column experiment was constructed to simulate the migration of atrazine in a type of saturated loamy sand under the conditions of consecutive atrazine injection and soil column leaching with deionized water, respectively. The software HYDRUS-1D was used to simulate the migration process of atrazine in the soil column based on the one-site non-equilibrium adsorption model and the adsorption-desorption model. The results indicated that the simulation quality was influenced by the fitting methods. In the case of overall parameter fitting, the Nash-Suttcliffe coefficients(NSCs) and root mean squared errors(RMSEs) of the one-site non-equilibrium adsorption model were 0.909~0.922 and 2.752~3.167, respectively, for the simulation of the consecutive injection of atrazine; under the leaching condition, the NSCs of the simulation were negative and the RMSEs were 8.703~12.424. Under both experimental conditions, the NSCs and RMSEs of the adsorption-desorption simulation were 0.901~0.954 and 2.037~3.289, respectively. By using segmental parameter fitting for the one-site non-equilibrium adsorption model simulation, the NSCs improved to 0.919~0.941 while the RMSEs decreased to 2.405~2.986 for the consecutive injection of atrazine, and the NSCs improved to 0.927~0.940 while the RMSEs decreased to 2.036~2.309 for leaching. In the adsorption-desorption model simulation, the NSCs improved to 0.904~0.956 and RMSEs decreased to 2.037~3.247 for both processes. The fitting results indicated that in the case of overall parameter fitting, the one-site non-equilibrium adsorption model demonstrated a good fitting performance in simulating the migration of atrazine under the consecutive injection conditions but a poor fitting performance under leaching conditions, whereas the adsorption-desorption model could effectively simulate the migration of atrazine in saturated loamy sand under both experimental conditions. The fitting performance of both models could be improved by segmental parameter fitting in simulations of the processes of consecutive injection and leaching. |
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