Modelling river physical processes is of critical importance for flood protection, river management and restoration of riverine environments. Developments in algorithms and computational power have led to a wider spread of river simulation tools. However, the use of two-dimensional models can still be hindered by complexity in the setup and the high computational costs. Here we present the freeware Basement version 3, a flexible tool for two-dimensional river simulations that bundles solvers for hydrodynamic, morphodynamic and scalar advection-diffusion processes. Basement leverages different computational platforms (multi-core CPUs and graphics processing units GPUs) to enable the simulation of large domains and long-term river processes. The adoption of a fully costless workflow and a light GUI facilitate its broad utilization. We test its robustness and efficiency in a selection of benchmarks. Results confirm that Basement could be an efficient and versatile tool for research, engineering practice and education in river modelling.

模拟河流物理过程对于防洪、河流管理和河流环境恢复至关重要。算法和计算能力的发展导致河流模拟工具的广泛传播。然而，二维模型的使用仍然会受到设置的复杂性和高计算成本的阻碍。在这里，我们展示了免费软件Basement版本 3，这是一种用于二维河流模拟的灵活工具，它​​捆绑了用于流体动力学、形态动力学和标量对流扩散过程的求解器。地下室利用不同的计算平台（多核 CPU 和图形处理单元 GPU）来模拟大型域和长期河流过程。采用完全免费的工作流程和轻量级的 GUI 有助于其广泛使用。我们在一系列基准测试中测试其稳健性和效率。结果证实，地下室可以成为河流建模研究、工程实践和教育的有效且通用的工具。