Analysis Of Underground Drainage Pipeline Capacity Based On Hydraulic Spatio Temporal Modeling

Underground pipeline is the vital infrastructure of city. In recent years, the frequent occurrence of urban underground pipeline accidents, especially in urban waterlogging events bring the carrying capacity of underground drainage line into the focus of attention and study. But the complexity of the urban sewerage system leads to uncertainty in decisions. One is the supporting of drainage systems in controlling urban waterlogging, indicating whether the urban waterlogging can be relieved or solved. The other is if the urban drainage decisions can alleviate or solve the problem of insufficient carrying capacity of urban drainage lines, namely the effectiveness of planning and construction for urban drainage pipeline to discharge rainwater and sewage and process it timely in certain precipitation condition. Therefore, this paper is focus on how to simulate current status and design of urban drainage system with drainage knowledge. GIS network model and hydraulic temporal modeling expertise, and also to visualize cartographic analyze their decisions, so that to provide a scientific foundation for reconstruction and planning of the municipal sewer line.Drainage pipeline information modeling is currently emerging urban underground pipelines running state evaluation of technical means. Its hydraulic calculation model based on the urban underground sewer line system simulation. The model itself is usually some kind of nature or function approximation algorithm, which is a strategy for decision support. Underground drainage line is a typical form of urban infrastructure tree or mesh network distribution, and underground pipelines have to evolve over time, with the spatial distribution and characteristics of the life cycle by running, as the city's most important municipal facilities and underground drain line plays an increasingly important role in the process of urban modernization. Currently, due to the lack of basic data, the study of underground drainage pipeline's operating rules consider using ID (based underground pipeline geographic information) hydraulic modeling method, that is, through the underground drain lines hydraulic modeling, simulation of urban drainage systems work status, urban drainage system reasonable scientific evaluation. However, this method has a single object of study, research conditions simply inadequate expression and space-time continuum are not strong and other issues, and therefore can not accurately simulate the evolution of the regional disaster underground drainage is not conducive to solving engineering decisions in the field of urban underground sewer line reconstruction program, and how to make a better temporal modeling of underground water and sewer lines show checking. Bases on these, the drainage model input parameters are adjusted. The drainage model simulation precision field is promoted and the of urban drainage system is optimized. Above method is to enhance the use of drainage model ability to find the the results of the output methods to improve the underground drainage line geographic information modeling accuracy, quick acceptance and knowledge of the drainage analysis, resulting in an integrated hydraulic model of physics basis, to achieve localization of underground drainage model, accurate positioning of model parameters and input conditions, and thus the transformation of urban drainage plan and evaluate the pros and cons, is the core of this paper.In summary, the geographic information hydraulic modeling technology based on the drainage pipelines is an effective means that use cartography and geographic information research ideas and technologies to urban drainage areas of expertise, and evaluate their current status and future operation. Therefore, the use of means of hydraulic modeling of spatial and temporal analysis of urban drainage systems carrying capacity, is a new intelligent application of information models and urban drainage systems scientific evaluation methods geography. The model construction and checking of the drainage model based on knowledge is a basic problem of the main research. For this topic, the main content of this paper contains the following parts:Firstly, the phenomenon of urban drainage and drainage laws is described, and the uncertainly of urban drainage process is clarified, and the problems need to be solved. Secondly, we set a model of 1D unsteady flow and drainage construction information through the Saint-Venant equations, and, combine the shallow water equations making a hydraulic model of the earth's surface with 2D. Combining pipeline and terrain, the actual drainage process is researched to improve the accuracy of the drainage system simulation evaluation.The next, we bring a model thinking of an underground pipeline hydraulic based time and space into an urban drainage model with 1D+2D. A method combined with the multiple knowledge and models actuate this drain model which simulate working position of drainage in the different external conditions.Then, high-quality drainage thematic data, GIS and drainage expertise are used to check and calibrate the hydraulic model of the underground pipelines, these measures improve the accuracy of the hydraulic modeling and simulation. Also through the expansion of drainage pipeline catchment zone division, take into account the rainstorm research under the environment of urban drainage intrusion methods, improve the accuracy of model problems of the urban drainage system.Finally, practical cases will be introduced, This paper research the urban drainage pipelines hydraulic model based on spatial and temporal environment. Taking Lanhua Gou area of Kunming as the research object, the status of the urban drainage and the planning carrying capacity are simulated. Then, the graphics and analysis of the plan are carried out in order to provide basis for the municipal planning and decision-making.