Applicability of one dimensional algebraic model in brackish water irrigation of severe saline-alkali soil
ZHAO Liandong1, GAO Peiling1,2, WANG Naijiang1, LIU Xiaoyuan1, YANG Daming1, LIU Quanzhong2
1.School of Agricutural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255049, China; 2.School of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255049, China
Abstract:In order to verify the applicability of one dimensional algebraic model in brackish water irrigation of severe saline-alkali soil, one dimensional infiltration experiments are conducted in laboratory on saline-alkali soil with different levels of mineralization degree(2, 3, 4 and 5 g/L). The model parameters are decided by means of experimental relationships between infiltration rate and wetting front as well as cumulative infiltration. Then infiltration time history and moisture content of soil profile are simulated numerically with the model. The root mean squared error(RMSE)and the index of agreement(D)are chosen to evaluate the applicability of the model. The results show that all the RMSE of infiltration time is less than 6.7 min; all the D produced by infiltration time model is more than 0.99. All the RMSE of water content is <3.5%; all the D produced by water content model exceeds 0.90. This suggests that one dimensional algebraic model can effectively describe the infiltration process of severe saline-alkali soil, this model also can simulate water distribution in soil profile more accurately after an infiltration ends.
赵连东, 高佩玲,, 王乃江, 刘小媛, 杨大明, 刘全忠. 一维代数模型在重度盐碱土微咸水灌溉中的适用性[J]. 排灌机械工程学报, 2017, 35(3): 248-255.
ZHAO Liandong, GAO Peiling,, WANG Naijiang, LIU Xiaoyuan, YANG Daming, LIU Quanzhong. Applicability of one dimensional algebraic model in brackish water irrigation of severe saline-alkali soil. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(3): 248-255.
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