摘要
为探究在传统支状滴灌系统末端设置回流管后滴灌系统毛管主流流速增加后回流滴灌系统的输沙排沙潜力及其抗堵塞性能,通过周期滴灌实验分析回流滴灌系统的灌水均匀系数以及滴头堵塞情况,并对毛管内沉积泥沙分布特点和系统各部分输沙排沙所占比重进行分析。实验结果表明:0.035 m·s^(-1)回流、0.05 m·s^(-1)回流滴灌系统的灌水均匀系数、滴头堵塞数量均明显优于支状滴灌系统。回流流速为0.05、0.035、0.015 m·s^(-1)三种回流系统中毛管沉泥量依次增加,但均低于支状滴灌系统的毛管泥沙沉积数量,同时四种回流滴灌系统均表现为沿水流方向毛管内沉泥量逐渐增加。支状滴灌系统、0.015 m·s^(-1)回流、0.035 m·s^(-1)回流、0.05 m·s^(-1)回流系统回流排沙量分别为0、1.59、4.30、7.52 kg,表明回流管具有良好的输沙排沙能力。
In order to explore the transport potentials of sediment and anti-clogging properties in a new-type drip irrigation system,which was altered from traditional irrigation system by adding a return flow pipe,a periodic intermittent drip irrigation experiment was carried out using muddy water to investigate the properties of anti-clogging and uniform coefficient,and to analyze the distribution of sediment in lateral pipes and the sediment discharge in different parts of the drip irrigation system. The results showed that,when the return flow rate was 0. 035 m·s^(-1)and 0. 050 m·s^(-1),the uniform coefficient and the amount of clogged emitter in the new-type drip irrigation system were better than those in the branch drip irrigation system. The sediment quantity deposited in lateral pipes with return flow rate of 0. 050 m·s^(-1),0. 035 m·s^(-1)and 0. 015 m·s^(-1)in the drip irrigation system increased in turn but was wholly lower than that in the branch drip irrigation system. The sediment quantity deposited in lateral pipes in all the 4 kinds of irrigation system increased gradually along with the flow direction. The total amount of sediment discharged from the branch drip irrigation system,0. 015 m·s^(-1)return flow system,0. 035 m·s^(-1)return flow system and 0. 050 m·s^(-1)return flow system was 0,1. 59,4. 30 kg and 7. 52 kg,respectively,showing the good capacity of transporting and flushing sediment in the new-type drip irrigation system with return flow pipe.
出处
《干旱地区农业研究》
CSCD
北大核心
2017年第2期182-186,共5页
Agricultural Research in the Arid Areas
基金
内蒙古自治区重大水利科技专项(2014-117)
关键词
泥沙输移
滴头堵塞
回流管
回流流速
灌水周期
sand transport
emitter clogging
return flow pipe
return flow rate
irrigation period
