Scenario Construction Of Dam Safety Monitoring Under Multi-level Semantic Constraints

In recent years,the construction of dam safety monitoring projects has developed rapidly and has been very fruitful,laying a solid foundation for the construction of smart water resources.The introduction of Building Information Modelling(BIM)in dam construction projects has enabled information management throughout the life cycle of construction projects,improved the digital tools and platforms shared by dam safety monitoring projects and integrated management systems for smart water resources,with new methods and tools for integrating smart water resource systems.A platform for dam safety information management systems based on 3D BIM and Web GIS technology development has been applied in engineering practice,effectively organizing the sharing and unified management of different information sources between regional water agencies.However,challenges remain,such as the lack of flexibility in the configuration of the scenes in the constructed 3D dam scenes and the lack of scalability of the 3D scene objects.How to effectively organize dam physical models and improve the management and maintenance of dam scenes are issues that need to be considered when building 3D scenes for dam safety monitoring.To solve the above problems,the following work has been done in this thesis:(1)Discussed the current situation of domestic and international research on dam safety monitoring 3D scene construction,sorted out the research development trend,introduced the relevant methods for semantic representation of dam safety monitoring scenes,studied the theoretical methods of semantic fields and the construction rules of knowledge graphs,and laid the theoretical foundation for dam safety monitoring scene construction under semantic constraints.(2)A semantic representation method for dam safety monitoring based on semantic fields is proposed.By analyzing the spatial features,attribute features and topological relationships among scene objects of dam safety monitoring scenes,the scene objects are characterized in semantic fields,the semantic context of scene objects is enhanced according to semantic field theory,a unified semantic description framework is constructed for all kinds of scene objects,and then the knowledge graph technology is used to carry out entity semantic The semantic information in the BIM model of the dam components is mapped to the attribute information in the 3D scene objects,and the semantic information of each component corresponds to the spatial graphics file one by one,realizing the association between the dam safety monitoring scene objects and the semantic information,and further improving the semantic expression of the dam safety monitoring scene.The feasibility of the semantic representation is verified by realizing a dam safety monitoring knowledge graph result map using dam scene object data from a region.The method gives a unified framework for the semantic description of scene objects and enriches the semantic information of the BIM model of dam components integrated in the GIS scene.(3)A multi-level semantic constraint-based scheme for dam safety monitoring scene construction is designed.Factors related to dam safety monitoring scene construction are extracted and multi-level semantic constraint rules are proposed to guide the process of scene construction,which include spatial pose semantic constraints,spatial layout semantic constraints,and component combination semantic constraints.The multi-level semantic constraint rules are then parsed,and a scene configuration scheme is designed to describe the technical route from the combination of dam components into a 3D scene to organize the instantiated modelling knowledge file and dam scene objects.A 3D visualization platform for dam safety monitoring was developed using this approach for a water monitoring project in Tianjin.