规模化灌溉管网非恒定流模拟研究

Unsteady Water Flow Simulation for Large Scale Irrigation Network

针对环状和树状2种常用的管网形式,构建了恒定流数学表达式及数值模拟模型,并借助基本遗传算法提高了模拟结果的收敛性。在此基础上,借助Saint-Venant方程,以恒定流为非恒定流的初始与边界条件,构建了管网非恒定流数值模拟模型。针对实际典型境况,从数值稳定性、数值收敛性和质量守恒性3个角度,系统分析了构建的灌溉管网恒定与非恒定流数值模拟模型的模拟效果。结果表明,该模型可为规模化灌溉管网的管理评价和优化设计提供可靠的数值分析工具。

Mathematical expression and numerical model were constructed for steady water flow of irrigation network. Meanwhile, the genetic algorithm was introduced to improve the convergence of the simulation results. Then, the steady water flow was used as the initial and boundary conditions, and the unsteady water flow model was proposed for large scale network based on the Saint-Venant equation. The simulation performance of the proposed model was verified from three aspects, such as numerical stability, convergence and mass conservation. The results showed that the proposed model could provide an available numerical tool for the evaluation of the unsteady water flow in large scale irrigation network.