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| Influences of irrigation method on rainfall infiltration depth |
| JIN Xiaohui, CHEN Minjian*, YAN Long, WANG Yong, DENG Wei |
| Department of Water Resources China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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Abstract In order to study influences of irrigation method on rainfall infiltration depth, based on field in-situ observation experiment, the influences of drip irrigation under film and traditional surface irrigation conditions on initial moisture of rainfall infiltration were analyzed in the paper, and HYDRUS-2D software was applied to simulate the differences in rainfall infiltration under two irrigation conditions. The results showed that the drip irrigation under film altered the initial moisture of rainfall infiltration, and its influence on the initial moisture varied in different growth periods of maize. The rainfall infiltrations were simulated in different scenarios and it was demonstrated that under the same initial condition, the rainfall infiltration depth in two irrigation methods was mainly affected by rainfall and duration. If the rainfall is small, then the infiltration depth of drip irrigation under film is greater than that of traditional surface irrigation; with the increase of rainfall and duration, however, the infiltration depth of two irrigation methods tends to be consistent. Regardless of whether it is maize seedling or main growth stage, the initial soil moisture of rainfall infiltration always has a certain impact on the rainfall infiltration depth. In the seedling stage, the infiltration depth of drip irrigation under film is deeper than that of surface irrigation, but in the main growth stage, the infiltration depth of surface irrigation is deeper than that of drip irrigation under film.
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Received: 15 May 2018
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