由膜孔灌水流推进和消退资料推求灌溉质量指标研究

[目的]寻求简化灌水质量指标推求的方法。[方法]根据膜孔灌大田灌水试验实测资料,研究相同流量不同次灌水的水流推进和消退规律,基于充分供水条件下膜孔灌入渗规律的特点,提出了利用膜孔灌大田水流推进和消退资料推求膜孔灌灌水均匀度和灌水效率的方法。[结果]随着灌水次数的增加,水流推进加快,消退变慢,积水消退时间明显延长;膜孔灌田面水流推进和消退曲线满足一元二次函数关系。随着灌水次数的增加,畦首渗水时间变化不大,尾部渗水时间变化较大;研究提出的简化灌水均匀度计算公式,能简单而有效地求得大田膜孔灌灌溉质量指标。[结论]该研究为膜孔灌技术要素设计和灌水质量评价奠定了基础。

Study on Determination of Irrigation Quality Index Based on Water Flow Advance and Regression Data in Film Hole Irrigation

[Objective] The research aimed to seek for the simplified method of determination of irrigation quality index.[Method] Based on the field experimental data of film hole irrigation,the rule of water flow advance and regression of different irrigation times with same flow was researched.Based on character of infiltration law of film hole irrigation under the adequate water supply,a method of determining irrigation uniformity and irrigation efficiency of film hole irrigation was put forward by using the field experimental data of water flow advance and regression.[Result] With the increase of irrigation times,the water flow advance was quickened,the water flow regression became slow,the time of water accumulation and regression was prolonged obviously.The water in the field flow advance and regression curve could meet one-place quadratic function relation.With the increase of irrigation times,the water seepage time at the head of border check changed little,the water seepage time at the end of border check changed greatly.The simplified counting formula of irrigation evenness proposed in this study could determine the irrigation quality index of film hole irrigation in the field simply and effectively.[Conclusion] The research laid a foundation for the technical element design and irrigation quality evaluation of a film hole irrigation project.