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A river network model is developed for simulating flow dynamics in a large river system. The 1D Saint–Venant equations are discretised using the MacCormack finite-difference scheme. The junction nodes are treated as boundary nodes, and the method of Characteristics is used to solve the network system. The developed model is suitable for the river network, which consists of merging and diverging sub-reaches. The model is validated with the observed water surface profiles in a laboratory-scale river network system. The validated model is then applied to simulate flow in the Adyar River flowing through Chennai city. The upstream discharge and downstream tidal variation are imposed as boundary conditions. The simulated results are compared with the 1D HEC-RAS model outputs. The model’s accuracy confirms its applicability to simulate flow dynamics in a large river network system.

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An Explicit River-Network Model for Large-Scale Flow Simulation

  • 会议论文

  • 发表日期：

    2025年

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  • J. C. Chaitanya,
  • S. N. Kuiry

摘要

A river network model is developed for simulating flow dynamics in a large river system. The 1D Saint–Venant equations are discretised using the MacCormack finite-difference scheme. The junction nodes are treated as boundary nodes, and the method of Characteristics is used to solve the network system. The developed model is suitable for the river network, which consists of merging and diverging sub-reaches. The model is validated with the observed water surface profiles in a laboratory-scale river network system. The validated model is then applied to simulate flow in the Adyar River flowing through Chennai city. The upstream discharge and downstream tidal variation are imposed as boundary conditions. The simulated results are compared with the 1D HEC-RAS model outputs. The model’s accuracy confirms its applicability to simulate flow dynamics in a large river network system.