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| Wetting Pattern of Ridge-furrow Irrigation Infiltration Described with Moment Analysis |
| Zhang Yongyong1,2, Wu Pute2, Zhao Xining2 |
1. Linze Inland River Basin Comprehensive Research Station/Key Laboratory of Eco-hydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling 712100, Shaanxi, China |
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Abstract In order to provide guidance to reasonable design of technique parameters in ridge-furrow irrigation, the migration laws of wetting pattern were investigated. Soil water infiltration affected by soil physical properties, cultivation technique parameters, and irrigation technique parameters under ridge-furrow irrigation was numerically simulated by using the HYDRUS-2D model. The effect of variables on wetting patterns and ellipse characteristics were quantitatively evaluated by using moment analysis. The result showed that the wetting pattern was like an ellipse with a long axis in the horizontal direction. Initial soil water content had a minor effect on ellipse characteristics compared with other variables. The ridge-furrow irrigation technique should be implemented in finer soils. With the increase of furrow width and irrigation water depth, the elliptical area is increasing and the discrepancy of elliptical axis length is obvious, which significantly increase the lateral infiltration distance. We should select narrow furrows for sandy loam and wide furrows for clay loam. Spatial moment analysis allows a straightforward, physically meaningful description of the wetting pattern for subsurface water distribution.
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Received: 12 May 2014
Published: 20 September 2015
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2015, Vol. 35 
