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
【目的】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。【方法】通过室内土箱试验模拟大田单坑渗灌过程，研究了单坑渗灌红壤在不同灌水量（1、2 L和3 L）和不同灌水器埋深（10、15 cm和20 cm）条件下湿润锋运移距离、累积入渗量和土壤含水率的分布规律，并采用交替方向隐式差分法对土壤水分空间分布进行了模拟。【结果】入渗率随灌水量增大而增大，随灌水器埋深增大而减小；土壤入渗率在入渗初期较大，但随着时间推移逐渐减小，最终在较小范围内波动变化。在540 min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...
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| description | 【目的】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。【方法】通过室内土箱试验模拟大田单坑渗灌过程，研究了单坑渗灌红壤在不同灌水量（1、2 L和3 L）和不同灌水器埋深（10、15 cm和20 cm）条件下湿润锋运移距离、累积入渗量和土壤含水率的分布规律，并采用交替方向隐式差分法对土壤水分空间分布进行了模拟。【结果】入渗率随灌水量增大而增大，随灌水器埋深增大而减小；土壤入渗率在入渗初期较大，但随着时间推移逐渐减小，最终在较小范围内波动变化。在540 min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，灌水器埋深对垂向湿润锋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。【结论】Kostiakov模型（R2=0.998）较Philip模型（R2=0.892）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较好地模拟单坑渗灌红壤的空间水分分布状况（R2=0.827，E≤7.2%）。 |
| doi_str_mv | 10.13522/j.cnki.ggps.2021212 |
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| subjects | Emitters Horizontal orientation Infiltration Infiltration rate Irrigation Irrigation tanks Irrigation water Mathematical models Moisture content Movement Numerical models Soil water movement Soil water storage Soils Spatial distribution Storage tanks Subsurface irrigation Temporal distribution Water content Water depth Water infiltration Wetting Wetting front |
| title | 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 |
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