水保所知识产出(1956---)知识库

以雨鸟 LF1200 型喷头为研究对象，在室内无风条件下，应用视频雨滴谱仪分别监测了竖管铅直和垂直
于坡面 2 种布置方式在不同坡度下的水滴直径和速度等信息，对比分析了不同竖管布置方式下水滴平均直径及水滴
频率沿射程的分布差异，探讨了水滴速度和水滴直径之间的关系，结果表明:竖管垂直于坡面布置下水滴平均直径沿
射程的增大趋势更为稳定，相同测点在不同坡度下的水滴平均直径沿射程的差异变化不明显;竖管垂直于坡面布置
时，各坡度下的水滴速度随直径的增大趋势更为接近，且水滴速度与直径的对数相关性更好;竖管垂直于坡面布置不
仅能降低喷头附近的水滴蒸发损失，还能在一定程度上改善喷灌质量。研究结果可为坡地喷灌系统设计提供参考。

 In this study，the Ｒainbird LF1200 sprinkler was selected as the research object． The droplet diameter and velocity of standpipe
vertical and perpendicular to the slope on different slopes were measured by Two-dimensional Video Disdrometer under no wind condition．
The distribution differences of average droplet diameter and its frequency along spray direction under different layouts of standpipe was
compared，respectively． The relationship between the average droplet diameter and velocity was discussed． The results show that: the
increasing tendency of the average droplet diameter along spray direction under layout of standpipe perpendicular to the slope is more stable，
and at the same measuring point，the difference of droplet diameter along spray direction on different slope is not obvious; when the standpipe
is perpendicular to the slope，the increasing tendency of the velocity with the increase of droplet diameter is more similar，and the logarithmic
correlation of the droplet diameter and velocity is better; the layout of standpipe perpendicular to the slope can reduce the water evaporation
loss of the droplets near the sprinkler，and to some extent，the quality of sprinkler irrigation is also improved． The conclusions of this study
can provide useful information for design of sprinkler irrigation system on sloping land．