摘要
首先分析了田面微地形对滴头实际工作压力的影响,田面越不平整,滴头实际工作压力与设计工作压力的差值越大,当田面局部高差大于滴头设计工作压力时,滴头流量等于零;然后提出了田面微地形产生的流量偏差率公式,并用泰勒级数展开;最后利用描述统计方法和独立样本T-检验的方法对余项进行分析,置信度为99%的余项取值区间为0.001￣0.002,说明余项能够被忽略,田面微地形产生的流量偏差率公式可以用简单的形式来表示。
The influence of the farmland micro-terrain on the actual operation pressure of the emitter was analyzed firstly. The more uneven the farmland was, the more deviation between the actual operation and designs pressure of the emitter was. When the designs pressure of the emitter was below to sectional difference of farmland elevation, the flow of the emitter would be equal of zero. The calculation formula of the flow deviation rate of the emitter, which was from the farmland micro-terrain, was proposed and developed by the formula of Tailor. By method of described statistic and T-test, the surplus of the formula of Tailor was analyzed. The result indicated that the surplus could be neglected and the calculation formula of the flow deviation rate of the emitter, which was from the farmland micro-terrain, was determined by simple form.
出处
《中国农学通报》
CSCD
2005年第6期420-423,共4页
Chinese Agricultural Science Bulletin
基金
中国科学院知识创新项目"节水农业关键设备与重大产品研制及产业化开发"(2002AA2Z4101)
国家"十五"科技攻关项目
"黄土高原优质果业开发模式与技术研究"(2001BA508B20)
