滴头堵塞率及堵塞位置对灌水均匀度的影响

Influence of emitter clogged ratio and clogged location to the irrigation uniformity

采用控制堵塞试验的方法，在压力恒定的条件下，分析了堵塞率、堵塞位置对灌水均匀度的影响规律。试验结果表明：当压力在4～10 m 变化时，压力对于灌水均匀度的影响不显著，其变化范围在1％以内，生产实际中可以适当降低滴灌带的工作压力达到降低造价的目的；堵塞率是影响灌水均匀度的主要原因，堵塞率越高灌水均匀度越差，当堵塞率超过10％时，灌水均匀度 CU 已经远低于规范的最低值；只有当堵塞率不大于10％时，堵塞位置才对灌水均匀度有一定的影响，当堵塞位置分布在滴灌带前三分之一段和全段时，对灌水均匀度的影响较明显，此时灌水均匀度最小。

Using the method to control the clogged experiment ,under the condition of constant working pressure , has analyzed the influence rule of the emitter clogged rate ,clogged location to the irrigation uniformity .The test results showed that ：When the working pressure was changed at the 4 to 10 m ,the influence of pressure to the irrigation unifor-mity was not obvious ,as the change range was less than 1% .So in the production practice ,the working pressure of the trickle irrigation line can be properly decreased to achieve the purpose of reducing the cost .It is found that the emitter clogged rate was the main reason for affecting the irrigation uniformity ,the higher emitter clogged rate ,the poorer irriga-tion uniformity .When the emitter clogged rate is high than 10% ,the irrigation uniformity CU will be more less than the minimal value in the code .So only the emitter clogged rate was less than 10% ,the logged position will be a certain in-fluence to the irrigation uniformity .When the emitter clogged position distributed at the first one-third section and along entire line ,the influence to the irrigation uniformity will be rather obvious ,right now the irrigation uniformity will be the minimum .