摘要
低压滴灌毛管进口工作压力、铺设长度、地面坡度及毛管管径是影响滴灌灌水均匀度的重要参数。试验研究结果表明,低压条件下毛管进口压力的变化对灌水均匀度的影响并不明显;灌水均匀度随着毛管铺设长度的增大呈降低趋势,管径越小,降低越显著,但在一定管长范围内,毛管铺设长度对灌水均匀度的影响并不明显;逆坡情况下,灌水均匀度随着坡度的增大而减小,顺坡情况下,灌水均匀度随着坡度的增大呈先增大而后减小的趋势,在2‰的坡度时达到峰值;灌水均匀度随着管径的增大而增大,当管径增大到一定程度后,灌水均匀度随管径增大的幅度减缓。
Low pressure drip irrigation is an important developing direction of drip irrigation technology for the future. Lateral inlet operating pressure, lateral length, terrain slope and lateral diameter are the important parameters that have effects on drip irrigation uniformity. The result shows that pressure variation has less effect on irrigation uniformity at low-pressure. Irrigation uniformity decreases as lateral length in- creases and the less lateral diameter, the more remarkably decreases. However, it is not affected obviously by lateral length at a certain range of length. Irrigation uniformity decreases as terrain slope increases un- der uphill slope. It increases firstly and decreases later as terrain slope increases under downhill slope. When terrain slope is 2‰, it achieves the maximum values. Irrigation uniformity increases as lateral diam eter increases, when lateral diameter achieves a certain value, it increases slowly as lateral diameter increa ses.
出处
《灌溉排水学报》
CSCD
北大核心
2008年第5期22-24,共3页
Journal of Irrigation and Drainage
基金
国家863重点项目(2006AA100214)
中科院水保所领域前沿项目(SW04104)
关键词
低压滴灌
灌水均匀度
毛管铺设长度
毛管管径
low pressure drip irrigation
Irrigation uniformity
lateral length
lateral diameter
