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This lecture covers the basics of physical and numerical modeling in river hydraulics, focusing on hydraulic constructions and the law of similarity. It explains the step-by-step process of digital simulation, the importance of physical modeling, and the decision support for model selection. The lecture emphasizes the significance of model testing, the challenges in achieving perfect similarity between models and prototypes, and the key dimensionless numbers used in modeling. It also discusses the principles of similarity, the Navier-Stokes equations, and the importance of accurate measurements in both physical and numerical modeling.