基于两阶段人工鱼群算法的U型渠道断面优化设计

渠道断面优化是控制农田水利工程成本的重要因素,已有的渠道断面优化研究以梯形渠道为主,对U型渠道研究较少。以优化U型渠道深度、圆弧半径和直线段外倾角为目标,建立以U型渠道过水断面面积最小为目标函数、满足设计流量要求的数学优化模型。根据U型渠道水力计算的复杂性,利用引入协调行为的两阶段人工鱼群算法,对渠道断面设计进行优化。优化结果满足边坡稳定等约束条件。将模型应用于连云港市赣榆区黑林镇土地整理项目,10条斗渠过水断面面积均减小,优化后占地面积共减少28.603 m~2,占原占地面积的5.0%。

Two-phase artificial fish swarm algorithm-based optimal design of U-shaped channel section

Channel section optimization is an important factor to control irrigation and water conservancy engineering cost, existing section optimization researched more about the trapezoidal channel, while less about the U-shaped channel.The depth，circle radius and camber angle of straight line section of the U-shaped channel are optimized herein，and then a mathematical optimization model is established by taking the minimum area of the water-carrying section as the objective function，which meets the requirement of the design flow rate. In accordance with the complexity of the hydraulic calculation made for the U-shaped channel，the channel section design is optimized with the two-phase artificial fish swarm algorithm，in which coordination behavior is introduced. The optimization result meets the constraint condition of slope stability，etc. Applying the model to the land consolidation project implemented at Heilin Town in Ganyu District of Lianyungang Municipality，all the areas of the water carrying sections of 10 lateral canals therein are decreased with the total reduction of the land occupation area of 28.603 m2 that is 5.0% of the original land occupation area.