| 引用本文: | 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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| 摘要: |
| 为了探究灌水量和灌水器埋深对单坑渗灌红壤水分入渗特性的影响,通过室内土箱试验模拟大田单坑渗灌过程,研究单坑渗灌红壤在不同灌水量(1L、2L、3L)及不同灌水器埋深(10cm、15cm、20cm)条件下湿润锋运移距离、累积入渗量和土壤含水率分布规律,并应用交替方向隐式差分法对土壤水分空间分布进行模拟研究。结果表明：入渗率随灌水量增大而增大,随灌水器埋深的增大而减小；在入渗初期土壤入渗率较大,但随着时间推移逐渐减小,最终在某一个较小的范围内波动变化。在540min内,随着灌水量的增加,湿润体和湿润锋最大运移距离均增大,且促进土壤水分向灌水器右下方运移,其中垂向湿润锋最大运移距离大于水平湿润锋最大运移距离,灌水器埋深对垂直湿润峰运移距离均呈递减趋势；灌水量对单坑渗灌土壤含水率的影响大于灌水器埋深的影响。Kostiakov模型(R2=0.9978)较Philip模型(R2=0.8924)能更适于描述单坑渗灌红壤的水分入渗过程；交替方向隐式差分法能够较好地模拟单坑渗灌红壤的空间水分分布状况(R2=0.8334,E≤7.2%)。 |
| 关键词: 坑渗灌;红壤;灌水量;灌水器埋深;入渗;数值模拟 |
| DOI： |
| 分类号:S275.9 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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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 |
