检索结果-南通市图书馆

Identification of contamination source in water distribution network based on consumer complaints

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2012年第6期19卷 1600-1609页

作者：陶涛黄海东信昆仑刘书明 College of Environmental Science and Engineering Tongji University School of Environment Tsinghua University

A new methodology was proposed for contamination source identification using information provided by consumer complaints from a probabilistic *** to the high uncertainties of information derived from users,the objective of the proposed methodology doesn't aim to capture a unique solution,but to minimize the number of possible contamination *** the proposed methodology,all the possible pollution nodes are identified through the CSA methodology *** then based on the principle of total probability formula,the probability of each possible contamination node is obtained through a series of *** to magnitude of the probability,the number of possible pollution nodes is *** effectiveness and feasibility of the methodology is demonstrated through an application to a real case of ZJ *** scenarios were designed to investigate the influence of different uncertainties on the results in this *** results show that pollutant concentration,injection duration,the number of consumer complaints nodes used for calculation and the prior probability with which consumers would complaint have no particular effect on the identification of contamination *** nodes were selected as the most possible pollution sources in water pipe network of ZJ City which includes more than 3 000 *** results show the potential of the proposed method to identify contamination source through consumer complaints.

关键词： water distribution network contamination source identification consumer complaints

STUDY ON OPTIMAL CONTROL OF MUNICIPAL water distribution network

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2001年第3期7卷 167-171页

作者：张宏伟杨芳庄健天津大学建筑工程学院天津300072 北京首都机场集团公司北京100621 天津外国语学院天津300204

A systematic investigation is made on the problems which are related to the optimal control of the municipal water distribution network.A mathematical model of forecasting the water short term demand is proposed using the time series trigonometric function analysis method;the service discharge based macroscopic model of network performance is established using the network structuring method;a relatively satisfactory mathematical model for the optimal control of water distribution network is put forward in view of security and economy,and solved by the constrained mixed discrete variable complex *** model is applied in many examples and the results are satisfactory.

关键词： water distribution network water demand forecast macroscopic model optimal control

Optimal operation of water distribution networks under local pipe failures

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2007年第3期14卷 436-441页

作者：田一梅 G.Y.FU 迟海燕刘烨 School of Environmental Science and Engineering Tianjin University Department of Civil Engineering Faculty of Applied Science University of British Columbia Vancouver BC V6T 1Z4 Canada

The optimal operation of water distribution networks under local pipe failures, such as water main breaks, was proposed. Based on a hydraulic analysis and a simulation of water distribution networks, a macroscopic model for a network under a local pipe failure was established by the statistical regression. After the operation objectives under a local pipe failure were determined, the optimal operation model was developed and solved by the genetic algorithm. The program was developed and examined by a city distribution network. The optimal operation alternative shows that the electricity cost is saved approximately 11%, the income of the water corporation is increased approximately 5%, and the pressure in the water distribution network is distributed evenly to ensure the network safe operation. Therefore, the proposed method for optimal operation under local pipe failure is feasible and cost-effective.

关键词： water distribution network local pipe failure macroscopic model optimal operation

Calculation of the water distribution networks Based on the Theory of Slow Transient Flow

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2014年第1期21卷 49-54页

作者： Hui-Zhe Cao Zhi-Gang Zhou He-Ping Tan Long Guo Fei-Fei Luo School of Municipal and Environmental Engineering Harbin Institute of Technology School of Energy Science and Engineering Harbin Institute of Technology

Urban water supply network is a modern urban survival and development of the infrastructure of a city,and its normal running conditions have important significance. The actual hydraulic process in the variableload water distribution networks can be treated as the slow transient flow which belongs to the unsteady flow. This paper analyzes the multi-loops network slow transient model based on graph theory,and the link flow matrix is treated as the variables of the discrete solution model to simulate the process of the slow transient flow in the network. With the simulation of hydraulic regime in an actual pipe network,the changing laws of the flow in the pipes,nodal hydraulic heads and other hydraulic factors with the passage of time are obtained. Since the transient processes offer much more information than a steady process,the slow transient theory is not only practical on analyzing the hydraulic condition of the network,but also on identifying hydraulic resistance coefficients of pipes and detecting the leakage in networks.

关键词： component: graph theory water distribution network slow transient flow inertial hydraulic head

Hazard and vulnerability evaluation of water distribution system in cases of contamination intrusion accidents

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2012年第6期6卷 839-848页

作者： Kunlun XIN Tao TAO Yong WANG Suiqing LIU College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Zhejiang Urban&Rural Planning Design Institute Hangzhou 300072China

In this paper, it proposed an index system for hazard and vulnerability evaluations of water distribution networks, based on the simulation of contamination events caused by pollutant injections at different junctions. It attempted to answer the following two questions in the case of contamination events： 1） Which are the most hazardous junctions？ 2） Which are the most vulnerable junctions？ With EPANET toolkit, it simulated the propagation of the contaminant, and calculated the peak concentration of the contaminant and mass delivered at different nodes. According to types of consumers, different weights were assigned to the consumer nodes for assessing the influence of the contaminant on the consumers. Using the method proposed herein, both the hazard index and vulnerability index were calculated for each node in the pipe network. The presented method was therefore applied to the water network of the city of Zhenjiang, which contains two water plants, two booster pump stations with storage tanks. In conclusion, the response time, the relationships between the peak concentration of contami- nant and the total absorption are the most important factors in hazard and vulnerability evaluation of the water distribution network.

关键词： water distribution network hazard vulner-ability contaminant accident

Per-unit Scheme for Integrated Solution of Hybrid Power-water Flow Problem

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 680-685页

作者： Xia Zhao Hong Tan Luo Wang Mingyi Sun State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

When applying the widely-used Newton-Raphson(N-R)method to the integrated solution of the hybrid power-water flow problem of the power-water integrated energy system(PW-IES),it is found that there are numerical differences among Jacobian elements,which may yield an ill-conditioned Jacobian matrix and even cause convergence ***,this letter proposes to per-unitize the water distribution network(WDN)to reduce the numerical differences and thus to improve the Jacobian matrix conditioning and the integrated N-R solution to the hybrid power-water flow problem.

关键词： Integrated energy system load flow Newton-Raphson method water distribution network power-water flow

Dynamic Scheduling Algorithm Based on Evolutionary Reinforcement Learning for Sudden Contaminant Events Under Uncertain Environment

在线全文

学校读者我要写书评

暂无评论

Complex System Modeling and Simulation 2022年第3期2卷 213-223页

作者： Chengyu Hu Rui Qiao Zhe Zhang Xuesong Yan Ming Li School of Computer Science China University of GeosciencesWuhan 430074China Department of Computer Science California State UniversityFresnoCA 93740USA

For sudden drinking water pollution event,reasonable opening or closing valves and hydrants in a water distribution network(WDN),which ensures the isolation and discharge of contaminant as soon as possible,is considered as an effective emergency *** this paper,we propose an emergency scheduling algorithm based on evolutionary reinforcement learning(ERL),which can train a good scheduling policy by the combination of the evolutionary computation(EC)and reinforcement learning(RL).Then,the optimal scheduling policy can guide the operation of valves and hydrants in real time based on sensor information,and protect people from the risk of contaminated *** verify our algorithm can achieve good results and effectively reduce the impact of pollution events.

关键词： evolutionary reinforcement learning water distribution network scheduling problem

Pump Scheduling Optimization in water distribution networks Incorporated with Deep Neural networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pump Scheduling Optimization in Water Distribution Networks ...

Investigation of factors affecting rural drinking water consumption using intelligent hybrid models

第32届中国过程控制会议(CPCC2021)

作者： Jiahui Xu Mei Meng Jingcheng Wang Department of Automation Shanghai Jiaotong University

Pump scheduling optimization is an essential guarantee for the safety and stability of water supply in water distribution networks(WDNs).However,the existing pump scheduling optimization methods are typically based on artificial experience with no systematic guidance and the empirical policy is relatively simple and not adaptive which makes it hard to implement since the real-world WDN is becoming *** this article,we attempt to address this issue by exploring data-driven approaches for pump scheduling optimization while considering arbitrary topology and no need for a hydraulic ***,the deep neural network is used to obtain the steady-state model of the ***,we use an adaptive policy to construct the loss function and use particle swarm optimization to implement online *** perform simulation studies using a realworld network in Shanghai to evaluate the effectiveness of the steady-state model and the control policy.

关键词： water distribution network Pump Scheduling Deep Neural network Particle Swarm Optimization

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

water Science and Engineering 2023年第2期16卷 175-183页

作者： Alireza Mehrabani Bashar Hamed Nozari Safar Marofi Mohamad Mohamadi Ahad Ahadiiman Department of water Science and Engineering Faculty of AgricultureBu-Ali Sina UniversityHamedan 65178-38695Iran University of Kurdistan Sanandaj 66177-15175Iran Sustainable Development Office of Hamedan water and Wastewater Company Hamedan 65159-14478Iran

Identifying the factors affecting drinking water consumption is essential to the rational management of water resources and effective environment protection. In this study, the effects of the factors on rural drinking water demand were studied using the adaptive neuro-fuzzy inference system (ANFIS) and hybrid models, such as the ANFIS-genetic algorithm (GA), ANFIS-particle swarm optimization (PSO), and support vector machine (SVM)-simulated annealing (SA). The rural areas of Hamadan Province in Iran were selected for the case study. Five drinking water consumption factors were selected for the assessment according to the literature, data availability, and the characteristics of the study area (such as precipitation, relative humidity, temperature, the number of subscribers, and water price). The results showed that the standard errors of ANFIS, ANFIS-GA, ANFIS-PSO, and SVM-SA were 0.669, 0.619, 0.705, and 0.578, respectively. Therefore, the hybrid model SVM-SA outperformed other models. The sensitivity analysis showed that of the parameters affecting drinking water consumption, the number of subscribers significantly affected the water consumption rate, while the average temperature was the least significant factor. water price was a factor that could be easily controlled, but it was always one of the least effective parameters due to the low water fee.

关键词： ANFIS water distribution network Simulated annealing algorithm Support vector machine Adaptive neuro-fuzzy inference system