# Overview of the Research Status of Intelligent Water Conservancy Technology System
## 2 Smart Water Conservancy System Based on Digital Twin  
The overall architecture of intelligent water conservancy based on digital twins should be able to describe the whole process of perception data from collection, transmission, analysis and processing, to embodiments of symbiosis, common intelligence and real-time interaction. Using the application of the new generation of information technology (such as big data, artificial intelligence, Internet of Things, cloud computing, mobile Internet, etc. ), establish the digital twin data and model integration method, study its operation mechanism, build the smart water conservancy twin, and design the smart water conservancy platform driven by the digital twin. Real-time monitoring, diagnosis, analysis, decision and prediction of water management are realized, providing new ideas for intelligent operation, accurate control, and safe operation and maintenance [15]. On the basis of this structure, according to the specific research object or application level, many intelligent water conservancy-related system architectures are derived, such as the digital twin water conservancy engineering system [16], etc. The specific contents of each system architecture are summarized in Table 1.  
According to the summary of the relevant system architecture of smart water conservancy in Table 1, the current smart water conservancy system usually adopts a multi-level structure design, such as the perception layer, the network layer, the knowledge layer and the application layer. This design clarifies the function of each component, making it easy to manage and maintain. In addition, the overall framework of digital twin water conservancy project construction [26] and the framework of digital twin basin construction [27] both reflect similar characteristics, that is, the digital twin platform is adopted as the core component. The platform is composed of the data base, model base and knowledge base. Based on the above comprehensive research of intelligent water conservancy and the digital twin framework, this paper aims to propose a digital twin intelligent water conservancy framework with virtual-real interaction and symbiosis characteristics. This framework will integrate the advantages of the multi-tiered structure and the digital twin platform to further enhance the management efficiency and service capacity of the smart water system. The framework is divided into perception layer, network layer, platform layer and application layer from bottom to top, and a network security system is set up vertically. As shown in Figure 2, the perception layer mainly employs satellites, drones, sensors, unmanned vessels and other technologies for multi-dimensional sensing of water conservancy information. It also enables interaction with infrastructure through the Internet of Things. The network layer mainly consists of three parts: communication facilities, information networks and cloud-network integration. Communication facilities include NB-IoT, 5G and Zigbee. Information networks comprise the Wide area network, Metropolitan area network and Department network. Cloud-network integration includes the Water cloud, Public cloud and Private cloud. The platform layer includes the data backplane, model platform and knowledge platform, facilitating virtual interaction among physical entities, creating a symbiotic and intelligent effect. The data backplane includes data mapping, data