Simulation on water-absorption characteristic curve of infiltrating irrigation materials through Laplace-transform

• Published in: Nong ye gong cheng xue bao Vol. 31; no. 2; pp. 87 - 93
• Main Authors: Wang, Xiaojian, Zhang, Zengzhi, Mao, Yijian
• Format: Journal Article
• Language: Chinese
• Published: 01.01.2015
• Subjects: Agricultural engineering; Computer simulation; Differential equations; Error analysis; Errors; Infiltration; Irrigation; Mathematical models; Sodium
• ISSN: 1002-6819
• DOI: 10.3969/j.issn.1002-6819.2015.02.013

Infiltrating irrigation technology is an effective water-saving irrigation technology. As a new irrigation methods, it is getting a lot of attention. This study aimed to simulating the water-absorption performance curve using the Laplace-transform method, which transformed a problem of solving differential equations into a problem of solving algebraic equation. Meanwhile, the model had also been used to explore the numerical relationship between water-absorbing capacity and material components. PAM and sodium montmorillonite (Na-MMT) was used as experimental material, circular material cube (4 g for each, 10 mm in height, 5 mm in radius) was for samples. The results showed that: the relative error between the simulated and measured water-absorption rate were 0.04%-7.17% and root mean square error (RMSE) was <0.0717, indicating that the water-absorption rate curves characterized by using Laplace transform is effective and accurate. This study is valuble for design of infiltration irrigation materials and resea