The "Water Conservancy No.1" remote sensing satellite implements global monitoring of floods and waterlogging; Unmanned aerial vehicles patrol rivers and transmit real-time updates of watershed dynamics; Thousands of sensors in dams, gates, and reservoirs operate continuously, updating water level, flow rate, and other data in seconds; The digital twin system accurately predicts the evolution of flood peaks and provides a "smart brain" for scheduling decisions... During the 14th Five Year Plan period, water conservancy departments at all levels will promote the construction of digital twin basins, digital twin water networks, and digital twin projects in accordance with the requirements of "demand driven, application oriented, digital empowerment, and capacity enhancement". This will build a digital barrier for basin security, water resource allocation, and engineering safety, and continuously transform innovative achievements into tangible benefits for people's livelihoods. The more the perception network is woven, the denser it becomes. "Digital twin water conservancy is not simply a digital replica, but a 'virtual water conservancy system' that can be monitored, analyzed, and predicted. ”Li Rui, director of Zhejiang Provincial Water Resources Department, took the reservoir as an example. The digital twin can not only synchronize real-time data such as water level and storage capacity, but also provide dispatching schemes in flood season rainstorm, drought and water shortage scenarios, providing scientific basis for flood control dispatching and water supply guarantee. In June this year, the combination of plum rain and typhoon "Butterfly" caused heavy rainfall in the upper and middle reaches of the Qiantang River. Zhejiang Province accurately predicted the peak flow of Lanxi 24 hours in advance, providing decision support for the staggered scheduling of reservoirs such as Fuchun River and Fenshui River. The ever-changing water and sand conditions, like a complex exam question, require a powerful 'smart brain' to solve accurately. Affected by recent rainfall in Shaanxi, the Jing River and Wei River in the middle reaches of the Yellow River have experienced significant water surges. Taking into account flood prevention and sediment reduction, the Yellow River Water Resources Committee of the Ministry of Water Resources has jointly dispatched reservoirs such as Sanmenxia and Xiaolangdi to implement the second water and sediment regulation of the Yellow River in 2025, starting from 9:00 am on September 8th. We coordinate the use of satellite remote sensing images, drones, rain radar, and 'smart stones', as well as monitoring equipment such as photoelectric sand detectors and water and sediment dynamics, water engineering scheduling models, to dynamically monitor and regulate reservoir sediment discharge and downstream water and sediment changes, accurately predict potential hazards and river regime evolution trends in the project, and iteratively optimize scheduling plans. ”Zu Leiming, Director of the Yellow River Water Resources Committee of the Ministry of Water Resources, introduced that according to the simulation results of the digital twin Xiaolangdi system, the expected discharge volume of this water and sediment adjustment is about 1.5 billion cubic meters, which can effectively wash the lower reaches of the Yellow River and provide strong guarantees for reducing sedimentation and improving flood discharge capacity of the river. If digital twins are the "smart brain" of hydraulic engineering, the perception network is the "nerve endings" that connect the physical world with the digital space. Previously, mountain flood warnings had to wait for 30 minutes, but now they can be accurately pushed within 15 minutes, saving valuable time for the public to evacuate, "said Tong Zeng, Deputy Director of the Zhejiang Hydrological Management Center. To improve the timeliness of warnings, the core is to accelerate the speed of data collection and transmission. In recent years, Zhejiang has conducted a comprehensive survey of 11500 key villages in 69 counties for the prevention and control of mountain flood disasters, upgraded and renovated hydrological monitoring stations and remote sensing terminals, and basically achieved the goal of "water level in towns and rainfall in villages". Building a digital twin water conservancy system is the only way to achieve "promoting high-quality development of water conservancy and ensuring water security in China". At present, China has basically formed an integrated monitoring and perception system for "sky ground water engineering", which includes 31 remote sensing satellites, more than 100 rain monitoring radars, over 4800 drones, 133000 ground hydrological flood reporting stations, and over 300000 engineering safety monitoring points. During the critical period of flood prevention in this year's' Seven Downs and Eight Ups', we fully utilized the integrated monitoring and perception system of 'Sky, Earth, and Water Engineering', built a digital twin platform data base covering 72 categories of 26 million water conservancy objects, generated a national digital watershed water system with a precision of 10 Mig network, and comprehensively grasped the dynamic changes in the underlying surface, submerged area, and engineering risks of river channels, reservoirs, and flood storage areas, providing strong data support for decision-making on water and drought disaster prevention. ”Fu Jing, Director of the Information Center of the Ministry of Water Resources, said. On September 13th at 23:00, with the successful arrival of the water replenishment head of the main stream of the West Liaohe River at Anlitun, connecting with the existing water surface downstream, the main stream of the West Liaohe River once again achieved full line overflow within the year, and the ecological environment of the basin continued to improve. In this river recovery operation, in order to maximize the role of each cubic meter of water resources, the Songliao Water Resources Committee of the Ministry of Water Resources continues to improve the integrated monitoring and perception network of "sky ground water engineering", further optimizing the digital twin function of the West Liaohe River, achieving real-time perception, dynamic simulation, intelligent judgment, and accurate decision-making of complex water resource scheduling processes. The digital twin West Liaohe River platform can collect real-time data from more than 17000 monitoring stations for precipitation, surface, underground, and water intake, and simulate the propagation time, combined flow rate, and evolution process of river water flow in a rolling manner. It optimizes the scheduling of reservoir storage, rainwater and flood control, external water diversion, and reclaimed water to obtain the optimal solution for water diversion, "said Lin Lan, chief planner of the Songliao Water Resources Committee of the Ministry of Water Resources. The digital twin water conservancy system provides strong data support for water network scheduling. Ningbo City, Zhejiang Province has set up over 14000 monitoring and perception points, covering seven major categories of water conservancy projects such as reservoirs and water supply, with massive data real-time aggregation and command center. On this basis, Ningbo has built a smart water network system of "reservoir group interconnection and three network collaboration", established a digital twin water network system, and combined the "twin three networks" of water supply, rainwater, and sewage to achieve full chain supervision of "source water plant leading". By inputting a 100 day water supply demand, the system will automatically optimize the allocation plan for reservoirs and water plants, and even plan to activate backup water sources. ”Zhou Yangjing, the person in charge of the Water Resources Management Center of Ningbo City, Zhejiang Province, introduced that during the drought resistance period in 2024, Ningbo will coordinate reservoir water storage and cross regional water diversion through a digital twin water network, and increase the supply of raw water to the urban area by 21 million cubic meters, stabilizing the urban water supply guarantee rate at 99.8%. In the field of water resources management, intelligent monitoring technology is still extending its application range. On February 28th of this year, the South to North Water Diversion Project safely passed the 11th ice age water transfer stage, with the Middle Route of the South to North Water Diversion Project transferring 41 million cubic meters more water to the Beijing Tianjin Hebei region than planned. In the past, scheduling relied heavily on experience judgment and manual calculation. Now, relying on intelligent scheduling business application platforms, automatic evaluation of water delivery capacity and dynamic optimization of water supply plans can be achieved. ”Sun Zhiyu, General Manager of China South to North Water Diversion Group Co., Ltd., introduced that the digital twin South to North Water Diversion Middle Route system has constructed a water temperature and ice forecast model that combines mathematics and mechanism, and integrates multidisciplinary algorithms such as hydraulics and thermodynamics. It has successfully achieved accurate simulation of the evolution of ice cover under dynamic water transfer conditions. Nowadays, the digital twin water conservancy system achieves accurate forecasting, warning, and scheduling of water resources by coordinating basin and regional living, production, and ecological water use. It optimizes allocation plans under different water inflow and demand scenarios, truly realizing the goal of "carefully calculating and utilizing water resources, and strictly managing water resources through meticulous management". The accelerated application of technological achievements has shifted from "civil defense" to "technical defense", from "intermittent inspection" to "real-time monitoring"... Currently, China's digital twin water conservancy construction has entered a new stage of comprehensive deepening and strengthening of application, starting from active exploration and pioneering. On the one hand, the "Water Conservancy No.1" remote sensing satellite network continues to carry out monitoring work on floods, glacial lakes, and other areas, with over 100 water conservancy rain monitoring radars in operation. Drones equipped with infrared cameras, LiDAR, etc. have initially achieved external detection of risks and hidden dangers in water conservancy projects such as dams; Robot dogs and robot acceleration are used for troubleshooting abnormal situations such as engineering cracks and leaks. On the other hand, the level of research and application continues to improve, with the development of "cloud rain" precipitation forecasting models, distributed flood forecasting models, and hydrodynamic flood transmission director models, further extending the flood prediction period and improving forecast accuracy, providing strong support for resisting watershed floods. The independently developed wind wave model of the Taihu Lake Lake predicted the maximum tilt of the lake during the typhoon "Gynura", which was basically consistent with the measured data. Developing models for crop water demand and dynamic optimization of canal system water distribution in Gansu, Jiangxi and other regions to achieve efficient water-saving irrigation of crops in irrigation areas. Fu Jing introduced that during this year's "Seven Down and Eight Up" flood prevention period, short-term precipitation forecasting models, meteorological hydrological coupling models, and knowledge graphs were developed to predict flood conditions in advance. In terms of flood control in river basins, a preliminary decision support system for "four predictions" for flood control in seven major river basins has been established, with an accuracy rate of over 90% for key period flood forecasting in major rivers. In terms of water resources management and allocation, under the premise of ensuring flood control safety, rain and flood resources are scientifically retained and regulated to win the initiative for salt resistance and supply assurance in the the Taihu Lake Lake basin, salt suppression and water supplement in the the Pearl River basin, and ecological water supplement in the Beijing Hangzhou Grand Canal. In terms of engineering management and scheduling, through online monitoring and intelligent analysis, the comprehensive benefits of the project can be fully utilized while ensuring project safety. The construction of a digital twin water conservancy system focuses on application and effectiveness. Minister of Water Resources Li Guoying stated that it is necessary to accurately grasp the new situation, new tasks, and new requirements faced by the construction of the digital twin water conservancy system. Following the principles of "demand driven, application oriented, digital empowerment, and capacity enhancement", we will accelerate the construction of an integrated monitoring and perception system for "sky ground water engineering", strengthen data collection and collection sharing, accelerate the research and application of monitoring technology and equipment, increase scientific and technological support, and implement full coverage, full space, full element, and all-weather monitoring and perception for water conservancy governance and management objects to ensure accuracy, synchronization, and timeliness. (New Society)