| Numerical simulations of water infiltration for various soil textures using HYDRUS-1D |
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| DOI：10.7606/j.issn.1000-7601.2018.04.20 |
| Key Words: HYDRUS-1D software irrigation various soil textures water infiltration soil water content distribution soil wetting depth |
| Author Name | Affiliation | | LIU Bin-bin | College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China | | LIU Yao-bing | College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China | | ZHANG Ke-feng | Ningbo Institute of Technology, Zhejiang University, Ningbo, Zhejiang 315100, China |
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| Abstract: |
| Quantifying water dynamics in soils is the basis for the rational water management in agriculture. In this study a systematic numerical investigation is carried out into the variations of soil water content and soil wetting depth after irrigation and 24 h after irrigation for various soil textures (silt, silt loam, sandy clay loam) using the HYDRUS-1D software. Results show that both soil water content and wetting depth 24 h after irrigation are only dependent on soil type and irrigation amount, and are not affected by irrigation rate. The re-distribution of irrigated water in soil is evident for the soil with a good drainage capacity. In the case of irrigation rate of 0.7 cm·h-1 and irrigation time of 3 h for the silt loam, the wetting depth immediately after irrigation and 24 h after irrigation is 9.2 cm and 20.6 cm, respectively, with the re-distribution amount up to 55.3%. There exists simple linear relationship between soil wetting depth and the total irrigation amount for various soils, and the gradient of the fitted equations ranges from 5.15 (silt) to 5.95 (sandy lay loam). The results obtained from this study could have the potential to be used in optimal water use in agriculture. |
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