This system applies the research and development of three-dimensional simulation technology to the three-dimensional simulation prediction of underground water supply network. Based on the principle of triangular patch reorganization, the Unity3D development engine combined with MySQL database is used to read the longitude and latitude of the pipeline, pipeline valves and other pipe network data in the database into the Unity3D, and then uses C# language programming to realize the automatic and rapid modeling of the three-dimensional pipe network. At the same time, the pipe network water supply flow direction display, change the ground transparency, pipe and valve positioning and other pipe network management functions are added. When clicking the pipeline, the corresponding id number, latitude and longitude, pipe diameter and other information will be displayed, and the simulation display of positioning valve position and water flow direction can be realized. In addition, based on graph theory, the use of breadth-first search algorithm to achieve the water supply network of single accident point treatment and multiple accident point valve closure strategy and affected pipe section analysis and prediction. According to the formed valve closing strategy simulation, the pipeline valves that need to be closed are analyzed and predicted one by one to form the final valve closing strategy; it can provide effective decision analysis for the management department of the urban water supply network to deal with the accident valve closing such as pipe network rupture.

The system is applied to the three-dimensional simulation prediction management of the underground water pipe network in Fugu County, Shaanxi Province. The results of the preliminary trial operation show that the system has the characteristics of fast modeling speed, convenient information display and good simulation prediction effect, which meets the needs of the water supply department for the three-dimensional rapid modeling and three-dimensional simulation prediction management of the underground water supply network, and improves the efficiency of the management and maintenance of the underground water supply network.