含沙水滴灌条件下灌水器抗堵塞试验研究

对4种不同滴灌管(带)在含沙水滴灌条件下灌水器的出流量变化及淤积堵塞情况进行了田间试验研究。经过多次灌水试验,结果表明,4种滴灌管(带)灌水器出流量均随灌水次数的增加和距离毛管进水口长度的增加呈减小趋势,最后完全堵塞的灌水器均发生在毛管的末端;在相同水质和灌水压力下,大流量灌水器抗堵塞性能较好,即大流道灌水器的抗堵塞性能优于小流道灌水器;随着灌水次数的增加在滴灌管(带)的管腔内有细小泥沙淤积,小流量滴灌管(带)在70～80 m处泥沙淤积量骤然增加,大流量滴灌管(带)在80～90 m处骤然增加,管内泥沙的沉积大大增加了灌水器的堵塞几率,因此定期对滴灌带进行冲洗可以有效减小堵塞。

Anti-clogging Performance of Drip Emitters under Silt Content Water Irrigation

Under silt content water irrigation,discharge variation and deposition of four drip tubes(tapes) was studied through field experiment.After many irrigation experiments,the results demonstrated that with the increasing of irrigation frequency and distant from inlet of lateral,discharge of four drip tubes(tapes) all decreased,and finally completely clogged emitters located at the terminals of the laterals.Under the same water quality and irrigation pressure,the anti-clogging performance of large flow rate emitter was much better,namely large flow path emitter was better than small.With the increasing of irrigation frequency small silt deposited in all drip tubes(tapes),and for small flow rate drip tubes(tapes) suddenly increased at 70~80 m,but for large ones suddenly increased at 80~90 m,that increased the probability of emitter clogging.Washing drip tubes(tapes) regularly could decrease the probability of clogging.