| Cite this article: | 廖振棋,范军亮,裴青宝,等.不同灌水量和灌水器埋深下单坑渗灌红壤水分入渗特性及其模拟[J].灌溉排水学报,0,():-. |
| LIAO Zhenqi,FAN Junliang,PEI Qingbao,et al.不同灌水量和灌水器埋深下单坑渗灌红壤水分入渗特性及其模拟[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Infiltration Characteristics and Its Simulation of Red Soil under Single Pit Irrigation with Different Irrigation Amounts and Emitter Depths |
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LIAO Zhenqi1, FAN Junliang1, PEI Qingbao2, ZHONG Yun3,4,5,4,6
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1.College of Water Research and Architectural Engineering,Northwest A F University;2.College of Water conservancy and Ecological Engineering,Nanchang Institute of Technology;3.State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area,Xi'4.'5.an University of Technology,Xi'6.an
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| Abstract: |
| In order to investigate the influence of irrigation amount and emitter depth on the infiltration characteristics of red soil under single pit irrigation, indoor soil box was used to simulate the infiltration process of red soil under single pit irrigation. The migration distance of the wetting front, cumulative infiltration and the distribution of soil moisture content under different irrigation amounts (1L, 2L, 3L) and emitter depths (10cm, 15cm, 20cm) were observed. The alternative direction implicit difference method was also used to simulate the spatial distribution of soil water content. The results showed that the infiltration rate increased with the increase of irrigation amount and decreased with the increase of emitter depth. The infiltration rate was large at the initial stage of infiltration, but it gradually decreased over time, and finally fluctuated within a certain range. Within 540 min, the wetting area and the maximum migration distance of wetting front increased with the increase of irrigation amount, which promoted the soil water to move to the lower right of the emitter. The maximum migration distance of vertical wetting front was greater than that of horizontal wetting front. The influence of the irrigation amount on soil moisture content was greater than that of the emitter depth. The Kostiakov model was more suitable than the Philip model for describing the infiltration process of red soil water content under single pit irrigation. The alternative direction implicit difference method could simulate the spatial distribution of soil water content of red soil under single pit irrigation. |
| Key words: Pit irrigation; Red soil; Irrigation amount; Emitter depth; Infiltration |
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