[目的]研究节水灌溉工程设计方法,提高农田水利设施保水率和农田灌溉水的利用率.[方法]分析各种形式的渠道输水系统的适宜性,优化设计我国常用的梯型、U型明渠输水系统,以江苏省赣榆县班庄镇土地整理项目为例进行验证.[结果]根据项目地土壤条件选择预制混凝土U型渠道,渠床糙率为0.015,优化数学模型;F=(α+2.5％)min[F1+F2+F3]=(α+2.5％ )min[ Vf1+V2f2+ V4f3+cother];决策变量为纵坡I=1/2000,外倾角α=5°；得到投资最少,效果最佳的渠道断面,渠道总投资为37 806元.[结论]该优化设计方案切实可行.%[Objective] To study the design methods of water-saving irrigation engineering, so as to improve the water retention rate of conservation facilities and the utilization rate of irrigation water. [Method] The suitability of various channel systems was analyzed , the common ladder type and U-type open channel conveyance systems were optimized and then verified with a case study of the land consolidation project in Banzhuang Town of Ganyu County in Jiangsu Province. [Result] The U-type concrete channel was made according to local soil conditions, the roughness of channel bed was 0.015, a mathematical model was optimized; the decision variable was longitudinal slope = 1/2 000, camber angle = 5 ° ; the best channel section which costed the least was obtained, the total investment of this channel was 37 806 Yuan. [Conclusion] The designed scheme is practical.
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