灌溉渠道中非恒定流的计算及其应用
发布时间：2018-09-06 12:23
【摘要】：灌溉渠道在输水配水过程中由于用水变化导致控制建筑物的控制机构动态变化,以实现流量调节。通过调节,经非恒定流的过渡过程完成渠道从一种恒定流状态转向另一种恒定流状态。通过对明渠非恒定流理论进行系统论述,明确了控制灌溉渠道水流运动的方程组,为建立流动的数值模型打下了基础。应用Saint Venant方程组和Preissmann隐式差分格式建立明渠恒定流和非恒定流数值模型;所得到的恒定流代数方程采用简单迭代法求解,比其它计算水面线的方法简洁;得到的非恒定流非线性代数方程组采用Newton-Rapnson迭代法求解,线性代数方程组采用直接三角分解方法求解,模型考虑了分流口,闸、堰复合型内边界条件,模型具有较好的收敛性和稳定性;模型对更为复杂的边界条件有较好的可扩展性。将模型用于河南省开封柳园口灌区总干渠,可以对来流变化、闸门开度变化和分水口引水变化,以及恒定条件下的总干渠的流动进行模拟,得到的结果对实际应用具有一定的参考价值,同时为全面构建灌区全渠系流动及控制模型,奠定了基础。
[Abstract]:In order to realize the flow regulation, the dynamic change of the control mechanism of the building is caused by the change of the water used in the irrigation canal during the process of water transfer and distribution. By adjusting, the transition process of unsteady flow completes the channel from one constant flow state to another constant flow state. By systematically discussing the theory of unsteady flow in open channel, the equations for controlling the flow movement of irrigation channel are defined, which lays the foundation for the establishment of numerical model of flow. The numerical models of open channel constant flow and unsteady flow are established by using Saint Venant equations and Preissmann implicit difference scheme, and the obtained constant flow algebraic equations are solved by simple iterative method, which is simpler than other methods for calculating water surface lines. The nonlinear algebraic equations of unsteady flow are solved by Newton-Rapnson iterative method, and the linear algebraic equations are solved by direct triangular decomposition method. The model has better convergence and stability, and better expansibility for more complex boundary conditions. The model is applied to the general trunk canal of Liuyuankou Irrigation District in Kaifeng, Henan Province, which can simulate the change of inflow, the change of gate opening, the change of diversion of water diversion and the flow of total trunk canal under constant conditions. The obtained results have some reference value for practical application and lay a foundation for the overall construction of the flow and control model of the whole canal system in the irrigation area.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV133.2
[Abstract]:In order to realize the flow regulation, the dynamic change of the control mechanism of the building is caused by the change of the water used in the irrigation canal during the process of water transfer and distribution. By adjusting, the transition process of unsteady flow completes the channel from one constant flow state to another constant flow state. By systematically discussing the theory of unsteady flow in open channel, the equations for controlling the flow movement of irrigation channel are defined, which lays the foundation for the establishment of numerical model of flow. The numerical models of open channel constant flow and unsteady flow are established by using Saint Venant equations and Preissmann implicit difference scheme, and the obtained constant flow algebraic equations are solved by simple iterative method, which is simpler than other methods for calculating water surface lines. The nonlinear algebraic equations of unsteady flow are solved by Newton-Rapnson iterative method, and the linear algebraic equations are solved by direct triangular decomposition method. The model has better convergence and stability, and better expansibility for more complex boundary conditions. The model is applied to the general trunk canal of Liuyuankou Irrigation District in Kaifeng, Henan Province, which can simulate the change of inflow, the change of gate opening, the change of diversion of water diversion and the flow of total trunk canal under constant conditions. The obtained results have some reference value for practical application and lay a foundation for the overall construction of the flow and control model of the whole canal system in the irrigation area.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV133.2
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