Influence of muddy water concentration and particle diameter on clogging of labyrinth channels
Niu Wenquan1，2, Liu Lu1，3
(1.Institute of Soil and Water Conservation, Chinese Academy of Sciences/Ministry of Water, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 3.Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
A better understanding of the effect of suspended solids characteristics in muddy water on labyrinth path emitters is critical to prevent an emitter from clogging and select an appropriate water treatment approach in drip irrigation systems.In this study,the impacts of sediment particle size,sediment concentration and inlet pressure on the clogging level of the emitters used in drip irrigation systems were investigated by means of intermittent muddy water tests scheduled with the L (3 )orthogonal design table.The clogging level was evaluated with the relative average flow rate and irrigation uniformity coefficient of flow through an emitter.The result showed that the clogging level is determined by sediment particle size,sediment concentration and inlet pressure,but not monotonically related to a single factor.The clogging level is significantly influenced by the inlet pressure followed by sediment particle size when particle size<0.1 mm.In field irrigation practice,it is recommended to filter the fine sediment particles(<0.048 mm) and add dispersants to inhibit the flocculation of tiny viscous particles and so as to improve the performance of emitters.The findings from this study will help enhance our understanding of the clogging mechanisms of emitters and the use of high sediment water in drip irrigation.
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