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| Experimental study on free infiltration characteristics of muddy water film hole irrigation |
| HU Jianqiao1,2, WANG Jinghui3, ZHANG Jiangxiang1, CHENG Ziyong4 |
| 1. School of Civil Engineering, Longdong University, Qingyang, Gansu 745000, China; 2.Provincial Key Laboratory of Yellow Soil Engineering Properties and Applications, Qingyang, Gansu 745000, China; 3.Northwest Research Institute of Engineering Investigations and Design, Xi′an, Shaanxi 710003, China; 4. The Engineering College of Gansu Agricnltural University, Lanzhou, Gansu 730070, China |
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Abstract The influences of sand content on free infiltration characteristics of muddy water film hole irrigation and water content distribution in wetted soil are studied experimentally. Through indoor free infiltration of clean water film hole irrigation experiments with four different sand contents in muddy water, the relationships between free infiltrations of muddy water film hole infiltration parameters, wetting front transport parameters and wetted soil water content distribution parameters after the irrigation and the different sand contents are established. A cumulative infiltration model per unit film area, wetting front transport model, wetted soil water content distribution model and film infiltration declining feature due to the increasing sand content are put forward. It is demonstrated that with increasing muddy water sand content, the cumulative infiltration decreases and less than that of clean water under the same condition. The infiltration coefficient K decreases with increasing sand content, but the infiltration index α increases with the increasing content. In the same infiltration time, with increasing sand content, the vertical and horizontal wetting front transport distances are gradually reduced. With increasing distance from the center of film hole, the water mass content in wetted soil reduces gradually in the vertical and horizontal directions. The sand contents in muddy water can reduce film hole irrigation infiltration in comparison with clean water, particularly, the higher the sand content, the smaller the infiltration rate.
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Received: 01 July 2016
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