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Effects of water salinity on emitter clogging in surface drip irrigation systems

文献类型： 外文期刊

作者： Lili, Zhangzhong 1 ; Yang, Peiling 3 ; Zheng, Wengang 1 ; Li, Yunkai 3 ; Liu, Yu 3 ; Zhang, Chong 3 ;

作者机构： 1.Beijing Acad Agiculture & Forestry Sci, Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China

2.Minist Agr, Key Lab Qual Testing Hardware & Software Prod Agr, Beijing 100097, Peoples R China

3.China Agr Univ, Coll Water Resources & Civil Engn, 17 Qinghua Donglu,POB 57, Beijing 100083, Peoples R China

期刊名称：IRRIGATION SCIENCE （ 影响因子：2.94； 五年影响因子：3.214 ）

ISSN： 0342-7188

年卷期：

页码：

收录情况： SCI

摘要： Saline water can be used in drip irrigation systems, thus conserving freshwater. However, the emitters used in drip irrigation are easily prone to salinity-related chemical clogging, which has become a barrier to the exploitation and utilization of saline water in this context. We therefore analyzed the behavior and emitter distribution of chemical clogging using a drip irrigation experiment comparing four water salinities (1.0, 2.0, 4.0, and 6.0 dS/m) in the Hetao Irrigation District (Inner Mongolia, China). The results revealed that the clogging parameters (discharge ratio variation [Dra] and coefficient of uniformity [CU]) showed a slow-sharp downward trend under saline water conditions. Salinity had significantly negative, linear relationships with the two clogging parameters. We identified that the chemical clogging process exhibited randomness, but showed regularity where it usually occurred. Three types of chemical clogging process were identified, representing gradual, fluctuating, and sudden reductions in the clogging parameters. The highest risk location for chemical clogging was the end of the laterals, while the main site for sedimentation of the blocking materials was the core flow path of emitters. On the basis of the results, a water salinity of below 4.0 dS/m is recommended as suitable for use in drip irrigation systems.

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