A novel 1D-2D coupled model for hydrodynamic simulation of flows in drainage networks
A novel 1D-2D coupled model for hydrodynamic simulation of flows in drainage networks
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DOI：
10.1016/j.advwatres.2020.103519
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发表时间：
2020-03-01
影响因子：
4.7
通讯作者：
Xia, Xilin
中科院分区：
文献类型：
--
作者：
Li, Qian;Liang, Qiuhua;Xia, Xilin
排水管网模型通常是城市洪水预测和风险评估的重要组成部分。排水管网模型通常使用不同的数值程序来处理管道和接头中的流量。许多数值方案和模型的不同程度的复杂性已经开发和报告预测管道中的流动。然而，在路口的流动条件的计算得到了很少的关注，并已在传统上实现了通过求解连续性方程。这种方法易于实现，但它忽略了节点处的动量交换，不能为管道计算提供足够的边界条件。在这项工作中，提出了一种新的数值方案的基础上的有限体积的解决方案的二维（2D）浅水方程（SWES）计算的流动动力学在路口，它直接考虑到质量和动量守恒，并消除了实施复杂的边界设置管道计算的必要性。这种新的节点模拟方法，然后再加上广泛使用的两个组件的压力法（TPA）的管流计算，导致一个新的综合排水网络模型。新的一维-二维耦合排水网络模型进行了验证，对实验和几个理想化的测试情况下，以证明其潜在的高效和稳定的模拟排水网络中的流动动力学。
Drainage network modelling is often an essential component in urban flood prediction and risk assessment. Drainage network models most commonly use different numerical procedures to handle flows in pipes and junctions. Numerous numerical schemes and models of different levels of complexity have been developed and reported to predict flows in pipes. However, calculation of the flow conditions in junctions has received much less attention and has been traditionally achieved by solving only the continuity equation. This method is easy to implement but it neglects the momentum exchange in the junctions and cannot provide sufficient boundary conditions for the pipe calculation. In this work, a novel numerical scheme based on the finite volume solution to the two-dimensional (2D) shallow water equations (SWEs) is proposed to calculate flow dynamics in junctions, which directly takes into account both mass and momentum conservation and removes the necessity of implementing complicated boundary settings for pipe calculations. This new junction simulation method is then coupled with the widely used two-component pressure approach (TPA) for the pipe flow calculation, leading to a new integrated drainage network model. The new 1D-2D coupled drainage network model is validated against an experimental and several idealised test cases to demonstrate its potential for efficient and stable simulation of flow dynamics in drainage networks.