Study on the Application of the Drainage Pipe Network and River Channel Coupling Model in Urban Flood Control and Drainage

Urban drainage pipe network is the backbone of urban drainage, flood control and water pollution prevention, and is also an essential symbol to measure the level of urban modernization. A large number of underground drainage pipe networks in aged urban areas have been laid for a long time and have reached or practically reached the service age. The repair of drainage pipe networks has attracted extensive attention from all walks of life. Since the Ministry of ecological environment and the national development and Reform Commission jointly issued the action plan for the Yangtze River Protection and restoration in 2019, various provinces in the Yangtze River Basin, such as Anhui, Jiangxi and Hunan, have extensively carried out PPP projects for urban pipeline restoration, in order to improve the quality and efficiency of sewage treatment. Based on the management practice of urban pipe network restoration project in Wuhu City, Anhui Province, this paper analyzes the problems of lengthy construction period and repeated operation caused by the mismatch between the design schedule of the restoration scheme and the construction schedule of the pipe network restoration in the existing project management mode, and proposes a model of urban drainage pipe network restoration scheme selection based on the improved support vector machine. The validity and feasibility of the model are analyzed and verified by collecting the data in the project practice. The research results show that the model has a favorable effect on the selection of urban drainage pipeline restoration schemes, and its accuracy can reach 90%. The research results can provide method guidance and technical support for the rapid decision-making of urban drainage pipeline restoration projects.

The core of comprehensive treatment effect of water environment in river basin lies in pipe network system. The blockage of urban drainage pipe network is one of the main reasons affecting the healthy operation of urban drainage network system. So the intelligent analysis method of urban drainage pipe network blockage diagnosis can quickly find the problems of urban drainage pipe network and improve the operation and maintenance efficiency of urban drainage pipe network. In this paper, through the analysis of rainfall data, rainfall and sewage pipe network flow variation regular pattern, the change range, the essay obtains the rain and sewage pipe network blockage diagnosis threshold. Combined with the urban intelligent drainage pipe network system, through the customized setting of pipe network blockage threshold, the rapid diagnosis and early warning of the blockage problem of the drainage pipe network are realized, and the healthy operation of the urban drainage network is guaranteed.

Research on intelligent control theory and strategy of gas drainage pipe network based on graph theory

With the rapid development of urbanization, impervious areas spread quickly, which have greatly influenced regional hydrology and water resources. The water quality is getting worse and worse. The flood and drought disasters have aggravated. Human living environment has changed and consequently sustainable development of economy is restricted. The drainage pipe network plays a very important role in urban drainage and flood control. In the study, using of computer technology, the drainage capacity of study area in different design rainstorm return periods (P = 0.25, 0.5, 1, 2, 5, 10 a, respectively) is analyzed and simulated by Storm Water Management Model (SWMM). Part of the pipe network that are filled slowly and change great are found out fewer than 6 design rainstorms, which provide the basis for reconstruction of urban conduits. The simulation results can provide strong technical support for the city drainage system planning and management.

Efficient urban flood control and drainage management framework based on digital twin technology and optimization scheduling algorithm.

The problem of urban drainage has become more serious with the rapid development of urban construction. The idea of combining geographic information system (GIS) technology with flood control in solving the urban drainage problem has received increasing attention. The idea and process of GIS as the key technology in vertical planning were analyzed in this study based on the GIS technology characteristics. This paper presents the new idea of integrating flood control and drainage mode into vertical planning and the optimization method in vertical planning. Taking the vertical planning of the north shore of Xiaoqing River in Ji'nan as an example, the model of the present scenario and the corresponding terrain model of the different flood control drainage standards were established. The standard model of the flood control and drainage of Xiaoqing River was determined through comparison. The relationship between vertical planning, flood control, and drainage mode was analyzed and optimized on the basis of the practical engineering results. Improving the optimization measures can result in the good convergence of vertical planning and drainage content, which is conducive to the development of urban flood control.

Increasing urbanisation and climate change have had a significant impact on urban infrastructure due to the expansion of impervious surfaces. These surfaces lead to excessive runoff, which strains urban drainage systems beyond capacity and often causes damage. Traditional rainfall-runoff models often fail to adequately reflect the specific characteristics and limitations of urban pipe networks. These models typically use the Curve Number (CN) method to categorise land into eight types, including urban areas. This method primarily addresses surface and subsurface runoff without considering important urban infrastructure components such as drainage pipes and storage facilities. Recognising these shortcomings, this paper presents a new concept of distributed rainfall-runoff model, called S-RAT Urban, which incorporates the urban pipe network in the watershed analysis. The model incorporates both temporal and spatial variability of hydrological processes to improve the accuracy of runoff prediction. The model uses a distributed approach that applies the curve number method to better represent urban environments, including the effects of overlooks. The model uses a grid-based input system that uses Digital Elevation Models (DEMs), land use and soil type data to generate flow directions. The traditional two-dimensional (2D) flow direction mapping used in urban areas is converted to a one-dimensional (1D) pipe network model. This conversion is critical to realistically simulate flow through urban drainage systems. In addition, flow within the pipe network is calculated using continuous and impulse equations to provide a dynamic and realistic representation of the urban hydrological response under different weather conditions. This method not only identifies the variability of the hydrological cycle under natural conditions, but also incorporates critical urban infrastructure into the distributed model, providing a more comprehensive and practical tool for urban catchment management.

In this paper, operation optimization of integrated energy system based on variable efficiency characteristics of equipment and dynamic characteristics of pipe network is studied. The equipment includes combined heating and power unit, electric boiler, and wind turbine, photovoltaic power generation. An energy hub model based on dynamic efficiency characteristics of equipment is established. At the same time, the dynamic model of thermal pipe network is considered in this paper, while the dynamic process of the pipe network under the change of mass flow is discussed. The operation optimization considering the variable efficiency of equipment and pipe network is studied with the objective of the minimum operating cost. The results show that proposed operation optimization model has better economy, the case shows that the total cost was reduced by about 8.88%. And the thermal dynamic process of the pipeline network is more obvious in the large integrated energy system, that the average time of dynamic process is increased by 31 minutes than that of the small system in the case.

A 3D dynamic visualization method coupled with an urban drainage model

EPANET as a network modeling software is widely used in water pipe network design, operation and management. However, due to lack of pipe diameter property when importing from CAD network topology, the pipe network modeling efficiency has been restricted. EXCEL VBA function is known as easy to learn. A program of automatic assignment procedure for pipe diameter of the water network based on VBA is given in the present work. It is easy to understand, and greatly enhances the efficient of network modeling. EPANET INP file is used to be a data processing carrier. Make use of VBA functions for data search and calculation and improve software coupled to solve practical engineering problems. It helps to develop and progress water pipe network model, design, operate and management.

Purpose: to analyze the issues of development and application of an automatic control system for the technological process of water distribution in the Donskoy main channel (DMC) using proportional-integral differential PID controllers and a control scheme for the upstream. The urgency of this purpose is justified by the fact that effective management of water level in channel is of great importance for agricultural production and water supply to adjacent territories. The analysis of the main components of the control system, including PID controllers and the upstream control scheme is performed. The possibility of using these components for effective control and regulation of water level in the channel is considered. Materials and methods. A detailed analysis of the factors that must be taken into account when designing an automatic control system of water in a channel using PID controllers has been carried out. An algorithm for controlling water level in the upstream channel using PID controllers is proposed. Results. Measures for the water distribution management system development and implementation in the Donskoy main channel are proposed. It is stated that when designing a control system, the configuration of the channel and the measures to ensure a uniform distribution of water along its entire length should be taken into account, considering the unsteady water motion in the Donskoy main channel. The results of the analysis show that the automatic control system using PID controllers and the upstream control scheme has the potential to control the water level in the DMC effectively. Conclusions. Based on the analysis carried out, it was concluded that it is possible to design an automatic water control system in the DMC using PID controllers and a control scheme for the upstream successfully. Further research and development can contribute to the optimization of water distribution management and increase the efficiency of agricultural production in the region.

With the rapid advances of global climate change and urbanization, urban flooding is causing greater losses. Existing urban flood control and drainage engineering design standards are often applied to single projects. This paper proposes a set of urban flood model-driven optimization of flood control and drainage engineering solutions. Applied to Shenzhen’s Shawan interception project, the preferred option demonstrates significant improvements, such as the following: a 25% reduction ratio of the maximum designed water depth at key points of the Shawan River main stream, a 0.26% reduction in the maximum submerged area of the urban surface, a 3.27% reduction in the full pipe rate of drainage pipe, and a 10.81% reduction in the overflow rate of inspection wells. The comprehensive flood control and drainage benefits are the best, and they achieve the solution of problems within the basin. Aiming at the shortage of comprehensive consideration of project scale, combination mode, and control scheme in urban flood control planning and design, this simulation scheme proposes a set of detailed design technologies of urban flood control engineering based on a flood numerical model. The analysis results show that the ideas proposed in this paper can provide a reference for the design of urban flood control and drainage engineering.

Taking a certain area of a coastal city as the research object, based on the measured data, the model of rainwater pipe network and the hydraulic model of sewage pipe network in the study area were established based on SWMM. According to the set interception target combined with the established SWMM rainwater network model, the specific volume of Rain Water in the initial stage of each Rain Water discharge port is calculated, which is given to the sewage trunk pipe in the form of time series to realize the initial Rain Water interception control and analyze the receiving capacity of the sewage pipe network. In this study, 20% of the initial Rain Water was set up in the study area, which was given in the form of time series to the nodes in the sewage pipe network model. After the initial Rain Water was cut off 20%, part of the pipe segment and the node appeared overload phenomenon, but there was no overflow. After 30% initial Rain Water interception, overflow occurred in some pipe segments.

The three different urban flooding models were applied in Sukhumvit urbanized area in Bangkok. The first model can exchange the surcharged water and surface storage by using virtual reservoir applied with the pipe network model. The second model is the two layers model which is the combination of pipe network and street net work model. The last model is the Digital Elevation Model (DEM) linked with pipe network model. The result of simulation of all models compared with the flood field data showed that the last model provided the best computed result. To examine the extension of application of model A and B capability, it was found that the first model was still can be applied for the light rainfall case. The two-layered model can be applied for the moderate rain and suitable for real time control due to its reasonable performance time.

Despite urban drainage pipe networks being of great significance to urban flood control, few studies have focused on the influence of urban drainage pipe network structure on hydrological response. We studied two areas in downtown Dongying, Shandong Province, China, which have dendritic and loop drainage pipe networks, respectively. The loop network was converted to a dendritic system for scenario analysis using numerical simulation. Comparing the hydrological response of the original drainage system and the converted system showed that although the dendritic network could reduce node flood volume, the dendritic pipe overload situation was inferior to the loop network. Runoff in the former network was predominantly concentrated in the main pipes and near the outlets and the discharge-peak at the outlet was 47.0% greater than that of the loop. Thus, the loop drainage pipe network is more likely to reduce peak runoff at the outlet, which helps decrease flood risk.