Abstract: Most of the irrigation projects in China were built between 1950s and 1970s. Since the concrete structures are aging and out of repair, the safety of irrigation area is threatened and the irrigation and drainage capacity is seriously reduced, which has resulted in a poorer benefit of irrigation areas. This paper presents a new roughness reduction technology for aqueduct based on SK single-component polyurea coating. By indoor experimental study of the roughness characteristics of the materials, combined with in-situ hydraulic observation and calculation simulation of application, various fluid dynamics changes and flow increase of aqueduct after roughness reduction by coating are comprehensively evaluated. The application has improved the operation benefits significantly, which provides scientific and technological support as well as good reference for the upgrading and innovation of water conveyance projects in large-scale irrigation areas in China.

Key words: coating roughness reduction technology, SK single-component polyurea, roughness

摘要： 我国大多数灌区修建于20世纪50~70年代，由于水工混凝土建筑物老化失修，使灌区安全受到威胁，灌排能力严重下降，灌区效益不能充分发挥。提出SK单组分聚脲涂层减糙技术，通过室内材料糙率特性试验研究，结合工程应用现场原位水力学观测和计算模拟，综合评价采用涂层减糙技术后渡槽工程各种流体力学方面的变化和流量增加的情况，工程运行效益得到显著提升，为我国大型灌区输水工程的提升改造提供科技支撑，具有良好的借鉴意义。

关键词: 涂层减糙技术, SK单组分聚脲涂层, 糙率