Abstract Nowadays, the great power of modern computers allows to develop computational models able to deal with simulations of several coupled phenomena over detailed complex topography. An efficient and properly calibrated computational model represents a useful tool to provide insight into the catchment dynamics at hydrological and geomorphological levels. In addition, it allows to develop detailed risk management and conservation plans. In this work, we present a coupled surface-groundwater distributed flow model with hydrological (rainfall and infiltration) and geomorphological (suspended and bed load sediment transport) components. The coupled model is applied to well characterized experimental catchments that are used as realistic test cases. The calibration of the water flow model response to rainfall is performed by means of the fitting to experimental outlet hydrographs of the results supplied by a coupled formulation of 2D Shallow Water Equations and 2D Darcy’s law for saturated porous media connected via suitable infiltration laws. The calibration of a suspended and bed load model is also addressed by means of the fitting to experimental outlet sedigraphs. The numerical results show a good agreement between numerical and observed hydrographs and sedigraphs, significantly improving previous published simulations. Additionally, the need to repeat the simulations in the calibration processes is no longer an unapproachable problem.

中文翻译：

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一种二维有限体积模拟工具，可用于评估山区集水区的水文和形态动力学综合过程

摘要 如今，现代计算机的强大功能允许开发能够处理详细复杂地形上几种耦合现象的模拟的计算模型。有效且经过适当校准的计算模型是一种有用的工具，可以深入了解水文和地貌层面的流域动态。此外，它还允许制定详细的风险管理和保护计划。在这项工作中，我们提出了一个具有水文（降雨和入渗）和地貌（悬浮和床荷载沉积物输送）分量的耦合地表-地下水分布流模型。耦合模型应用于表征良好的实验集水区，用作真实的测试案例。对降雨的水流模型响应的校准是通过拟合实验出口水文过程线来执行的，该结果由 2D 浅水方程和 2D 达西定律的耦合公式提供，饱和多孔介质通过合适的渗透定律连接。悬挂和床荷载模型的校准也通过拟合实验出口 sedigraphs 来解决。数值结果显示数值和观察到的水文图和沉积图之间具有良好的一致性，显着改善了以前发表的模拟。此外，在校准过程中重复模拟的需要不再是一个无法解决的问题。