新型微孔渗灌管渗水性能初步试验研究

对一种国产新型渗灌管的渗水性能进行了室内初步试验，结果表明，在２ｍ的低水头情况下，渗管渗水不均匀，管壁有喷水现象，但其渗水速率较大。渗水速率随时间和累积渗水量的增加而减小，每次渗水的初始渗水速率与总累积渗水量之间呈指数关系衰减；初步确定出设计参考渗水速率为８．０～８．５Ｌ／（ｍ·ｈ）；渗水后的水质有明显变化，化学堵塞和物理堵塞是渗灌管渗水速率减小的重要原因。

Preliminary Experimental Study on Discharge Characters of a Subsurface Irrigation Tube

The discharge characters of a new type of subsurface irrigation tube made in China were preliminarily studied through indoor experiments. Results show that the subsurface irrigation tube has high discharge rate, but low uniformity at pressure of 2m water head. The design discharge rate of the tube is about 8.0～8.5 L/(m·h) under water head of 2m. The total accumulative discarged water amount is related exponentially to initial discharge rate of the tube. The discharge rate reduce with time and the increase of accumulative discharged water amount. Chemical and physical pluggings are two important factors to reduce discharge rate.