The digital twin can reconstruct the scenes of real traffic operation of inland waterways in the virtual space, giving birth to new ideas for the digital transformation and upgrading of water safety management. Aiming at the problems of video fragmentation, sub-system data separation and untimely emergency response in the current inland waterway safety monitoring, this paper proposes a new method for reconstructing and applying a digital twin of inland waterways based on 3D video fusion which consists of four parts: (1) Combining drone tilt photography and BIM modeling technology to construct a threedimensional scene model of inland waterways; (2) Proposing a multi-channel video three-dimensional registration and rendering method to integrate in real time discrete surveillance videos of different angles of view with three-dimensional scene model to establish the spatial correlation between different video images in the scene; (3) Integration multi-source IoT sensing data to form a scene of digital twin of inland waterways; (4) Based on water safety management requirements and business logic, to develop innovative applications of water safety management based on digital twin scenarios. A certain segment of the Changhu Shen Line was selected for demonstration and application. The application results show that the construction and application of digital twins for inland waterways combined with 3D video reduces the pressure on managers to understand real-time video footage and improves the efficiency of daily monitoring, evidence collection, and emergency response.INDEX TERMS digital twin, inland waterway, safety management, video fusion, safety management, inland waterway, 3D panorama

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