灌区节水改造中防渗渠道断面的优化设计

渠道防渗工程是当前灌区节水改造的重要内容之一,对原灌区骨干渠道系统的梯形土渠进行节水改造,其断面形式选用弧形坡脚梯形断面,其断面形式接近最佳水力断面、水流条件好、流速快、输沙能力强、防渗效果好、抗冻性能较高等优点.在此基础上,建立渠道纵横断面设计的系统动态规划模型,对灌区改造渠道进行纵横断面优化设计,并通过实例比较证实,该设计方法可以大幅度节省灌区节水改造项目的工程投资.

Optimal design of anti-seepage channel section for water-saving transformation in irrigation district

Channel anti-seepage project is one of the important contents for water-saving transformation in irrigation district. In the water-saving transformation to ladder-shaped earth canal of key channel system in original irrigation district, the ladder-shaped section of curved slope foot was selected as section of canal. Because it has a lot of virtues, such as close to optimal hydraulic cross section, fine water condition, hight velocity of flow, ability to convey sand, effectual prevention from seepage, resist of frost-heave performance. Based on this, a system dynamic planning model was built up to carry on vertical-lateral section optimization design to transform irrigation district channel. Comparing and verifying its merits through one instance, the study showed that this design method could reduce the engineering investment in large scale for irrigation district water-saving transformation project.