摘要
研究了不同供水水头(H)(0.5、0、-0.5、-1、-2m)及不同孔径的负压灌水器(3～4、5～6μm)对负压灌溉出水量及土壤水分运移的影响。试验结果表明,不同处理中,湿润锋运移规律相似,湿润体近似为椭球体。当灌溉时间相同时,湿润体体积随供水水头的减小而减小。累计入渗量、最大水平和垂直湿润距离随高程差呈幂函数变化。灌水历时相同,H=0.5、0、-0.5m时,孔径为5～6μm的灌水器出水量较大,而H=-1、-2m时,孔径为3～4μm的灌水器出水量较大。
A series 1aboratory experiments were arranged to study the effects of different water head（H=0.5,0,-0.5,-1,-2 m）and emitters（emitter aperture of 3~4 μm and 5~6 μm） on the soil water movement and efficiency of negatively pressurized irrigation system.A 30° wedge-shaped Plexiglas container was used to represent one twelfth of the complete cylinder.The results show that the wetting fronts have a same movement regular pattern and the wetting body is almost ellipsoid-shaped under different treatments.Volume of wetting body decreases with the decrease of hydraulic heads during same irrigation time.The relationships between time and cumulative infiltration,the maximum horizontal and vertical wetted distances are power functions.During the same period,when H=0.5,0,-0.5 m,the emitter aperture of 5~6 μm has higher efficiency,but when H=-1 m,-2 m,the emitter aperture of 3~4 μm has higher efficiency.
出处
《灌溉排水学报》
CSCD
北大核心
2011年第5期71-74,共4页
Journal of Irrigation and Drainage
基金
山西省高校科技开发资助项目(2010104)
山西省自然科学基金资助项目(2007011063)
关键词
负压灌溉
湿润锋
累计入渗量
负压灌水器
negative pressure irrigation
wetting front
cumulative infiltration
negative pressure emitter
