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| DOI：10.13522/j.cnki.ggps.2017.12.011 |
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| The Effect of Sediment Content on Water Infiltration from A Single Hole in Muddy Water Film Hole Irrigation System |
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LIU Lihua, FEI Liangjun, ZHU Hongyan, WANG Jinhui
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Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China; Northwest Research Instituye of Engineering Investigations and Design, Xi’an 710003, China
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| Abstract: |
| In order to unravel the effect of sediment content on water infiltration from a single hole in muddy water film hole irrigation system, we took Xi’an silty loam as example and conduced laboratory experiments to measure water infiltration from a single hole when the sediment content was 0, 3%, 6%, 9% and 12% respectively. Models were established to link change in the vertical moving distance of the wetting-front, the cumulative infiltration volume per unit area to infiltration time and sediment content. The results showed that with an increase in muddy content, the moving distance of the wetting front and the cumulative infiltration volume of per unit area, as well as the steady infiltration rate all decreased. In the same infiltration time, the infiltration coefficient decreased as the muddy content increased, but the decay ratio of the infiltration increased with the muddy content. There was a strong power-law relationship between the infiltration decay ratio and the infiltration time. The infiltration decay ratio changed dramatically during the initial infiltration process, but could be deemed to have reached steady state 200 minutes after the infiltration. |
| Key words: sandy rate; muddy water film hole irrigation; free infiltration; steady infiltration ratio; infiltration decay ratio |
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