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arXiv 2104.02891physics.flu-dyncs.NAmath.NA
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变宽明渠一维浅水流动水深和摩阻的瞬变流速估算

Bathymetry and friction estimation from transient velocity data for 1D shallow water flows in open channels with varying width

Miguel Angel Moreles, Gerardo Hernandez-Duenas, Pedro Gonzalez-Casanova

摘要:

浅水方程(SWE)模拟了各种地球物理流。具有矩形截面的通道中的流动可以用具有变化宽度的简化的一维SWE来模拟。在其他模型参数中,需要有关水深和摩擦系数的信息,以便正确和精确地预测水流。虽然模型参数的综合值可能足以用于测试数值方案,但应用时可能需要水深和其他参数的近似值。估计可以通过实验方法获得,但其中一些技术可能是昂贵的,耗时的,并不总是可用的。在这项工作中,我们建议解决反问题,估计水深和曼宁的摩擦系数从瞬态速度数据。这是一个成本功能,其中包括通过拉格朗日乘数的SWE的援助。通过连续下降法求解约束优化问题得到解。直接问题和伴随问题均采用二阶精度Roe型迎风格式进行数值求解。数值试验表明了该算法的优越性。

英文摘要:

The shallow water equations (SWE) model a variety of geophysical flows. Flows in channels with rectangular cross sections may be modelled with a simplified one-dimensional SWE with varying width. Among other model parameters, information about the bathymetry and friction coefficient is needed for the correct and precise prediction of the flow. Although synthetic values of the model parameters may suffice for testing numerical schemes, approximations of the bathymetry and other parameters may be required for applications. Estimations may be obtained by experimental methods but some of those techniques may be expensive, time consuming, and not always available. In this work, we propose to solve the inverse problem to estimate the bathymetry and the Manning's friction coefficient from transient velocity data. This is done with the aid of a cost functional which includes the SWE through Lagrange multipliers. The solution is obtained by solving the constrained optimization problem by a continuous descent method. The direct and the adjoint problems are both solved numerically using a second-order accurate Roe-type upwind scheme. Numerical tests are included to show the merits of the algorithm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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