scholarly journals Fuzzy Modeling of Urban Water Supply Crisis

2021 ◽  
Author(s):  
Welitom Ttatom Pereira da Silva ◽  
Marco Antonio Almeida de Souza
Keyword(s):  
Water Supply ◽  
Conceptual Model ◽  
Influencing Factors ◽  
Water Consumption ◽  
Model Performance ◽  
Real Data ◽  
Model Parameters ◽  
Urban Water ◽  
Urban Water Supply ◽  
Proposed Model

The chaotic growth of cities results in numerous problems related to public health and urban environment. One of these problems is the urban water supply system crisis. This research aims to develop a mathematical model for urban water supply crises (UWC) able to deal with the ambiguity of the real available data. The applied methodology comprises the following steps: (i) identifying the influencing factors in UWC; (ii) proposing a conceptual model for the description of UWC; (iii) collecting and simulating the necessary and available data; (iv) optimizing the conceptual model parameters; and (v) verifying the proposed model performance. The results indicate that there are many influencing factors in UWC. The model developed comprises two parts or two sub-models. The first sub-model explains water consumption, and the second sub-model explains water availability. In the first sub-model, the functions are related to the factors that influence water consumption. In the second sub-model, the functions are related to the factors that influence the availability of water. This research also aims to analyze the possibility of applying Fuzzy Logic to deal with the ambiguity of real data. It was concluded that, with the proposed model, the UWC was modeled appropriately. The model proposed can help to predict the impact of actions such as reducing losses, reducing pressure on the water supply network and intermittent supply on the intensity of water crisis cases in cities.

MATHEMATICAL MODELLING OF URBAN WATER SUPPLY SYSTEM CRISIS

Engevista ◽  
2011 ◽  
Vol 13 (1) ◽  
Author(s):  
Marco Antonio Almeida de Souza ◽  
Welitom Ttatom Pereira da Silva
Keyword(s):  
Water Supply ◽  
Conceptual Model ◽  
Urban Environment ◽  
Influencing Factors ◽  
Water Consumption ◽  
Water Availability ◽  
Supply System ◽  
Water Supply System ◽  
Urban Water ◽  
Urban Water Supply

Purpose – The chaotic growth of cities results in numerous problems related to public health and urban environment. One of these problems is the crisis in urban water supply systems. The objective of this paper is to develop a mathematical model for the water supply system crisis in urban environment (WSC) able to tackle with the ambiguity of the real available data.Design/methodology/approach – The applied methodology comprises the following steps: (1) identification of the influencing factors in WSC; (2) proposal of a conceptual model for WSC description; (3) gathering and simulation of the necessary and available data; (4) optimization of the conceptual model parameters; and (5) verification of the proposed model performance.Findings – The results indicated that there is a great amount of influencing factors in WSC (showed in the complete text); the conceptual model that was developed is composed by two others partial models ( ). The first partial model explained the water consumption ( ),and the second partial model explained the water availability ( ), in which functions are related to influencing factors in water consumption (i.e. temperature, relative humidity, rainfall, revenues collected, unemployment indicator), and functions are related to the influencing factors in water availability (i.e. total water-loss, intermittence in water supply system). The proposed conceptual model has showed good agreement to the simulated data.Originality/value – The paper is among the first works to describe a WSC model and to analyze the possibility of applying fuzzy logic to deal with the ambiguity of the real data. The water supply crisis in urban environments was adequately modelled.

scholarly journals Optimization of water reservoir volume in an urban water supply system

2021 ◽  
Author(s):  
Lucija Plantak ◽  
Bojan Đurin ◽  
Tatjana Džeba ◽  
Sara Dadar
Keyword(s):  
Water Supply ◽  
Water Consumption ◽  
Water Reservoir ◽  
Supply System ◽  
Water Supply System ◽  
Urban Water ◽  
Urban Water Supply ◽  
Functional Relationships ◽  
Reservoir Volume ◽  
Water Pumping

In this paper, the water pumping regime, as well as the water consumption regime with regard to the required quantities and the example of water consumption, with an emphasis on changes in water volume, are examined. This aims to show the functioning of the regime of water consumption, water pumping, as well as finding functional relationships between the mentioned sizes and the volume of the water reservoir. The analysis focuses on questions such as how and in what way, changes in the onset and duration of pumping, as well as different water consumption regimes affect the size of the reservoir volume. The entire analysis in this paper was done to develop a scientifically innovative, but also applicable mathematical model, which is a contribution to the profession and a good basis for further scientific research to improve the operation of the urban water supply system.

Urban Water Consumption Forecasting Based on Projection Pursuit

2012 ◽  
Vol 542-543 ◽  
pp. 1334-1338
Author(s):  
Zhao Han Wang ◽  
Chang Guo Xuan ◽  
Qiang Fu
Keyword(s):  
Water Supply ◽  
Water Consumption ◽  
Projection Pursuit ◽  
Nonlinear Problems ◽  
Supply System ◽  
Forecasting Model ◽  
Urban Water ◽  
Urban Water Supply ◽  
Analysis Method ◽  
New Approach

In order to meet energy conservation and utilization optimization in urban water supply system and ensure water supply time and efficiency, we adopted the projection pursuit autoregression method to establish the projection pursuit autoregression water consumption forecasting model, combined the projection pursuit technique and time-series autoregression analysis method, and better solved the abnormal and nonlinear problems in urban water consumption. The practice proves that the forecasting precision of this model reaches the engineering requirements, and it provides a new approach for water consumption forecasting and analysis.

scholarly journals Urban Comprehensive Water Consumption: Nonlinear Control of Production Factor Input Based upon the C-D Function

2019 ◽  
Vol 11 (4) ◽  
pp. 1125 ◽  
Author(s):  
Kebai Li ◽  
Tianyi Ma ◽  
Tom Dooling ◽  
Guo Wei
Keyword(s):  
Water Supply ◽  
Production Function ◽  
Water Consumption ◽  
Water Demand ◽  
Demand Function ◽  
Production Factor ◽  
Urban Water ◽  
Urban Water Supply ◽  
Labor Input ◽  
Urban Water Demand

Utilizing the urban water demand function and the Cobb-Douglas (C-D) production function, an economic control model for the multi-input-multi-output (MIMO) nonlinear system was designed and implemented to describe urban comprehensive water consumption, where the urban water demand function was expressed as the product of the number of water users and per capita comprehensive water consumption, and the urban water supply function was expressed as a C-D production function. The control variables included capital investment and labor input for the urban water supply. In contrast to the Solow model, Shell model and aggregate model with renewable labor resources, the proposed model eliminated value constraints on investment and labor input in the state equations and hence avoided the difficulty in applying these models to urban water supply institutions. Furthermore, the feedback linearization control design (FLCD) method was employed to accomplish stability of the system. In contrast to the optimal control method, the FLCD method possesses an explicit solution of the control law and does not require the solution of a two-point boundary value problem of an ordinary differential equation, making the method more convenient for application. Moreover, two different scenarios of urban water consumption, one for the growth period and the other for the decline period, were simulated to demonstrate the effectiveness of the proposed control scheme.

scholarly journals Presenting a conceptual model of leakage management system in urban water supply network from two preventive and operational perspectives (Case study of Tokyo and Tehran metropolises)

2021 ◽  
pp. 051-058
Author(s):  
Mohammadi Saeed ◽  
Najafzadeh Mahdi ◽  
Gheibi Mohammad ◽  
Kian Zahra ◽  
Takhtravan Amir ◽  
...  
Keyword(s):  
Water Supply ◽  
Conceptual Model ◽  
New Technologies ◽  
Technology Development ◽  
Urban Water ◽  
Supply Network ◽  
Urban Water Supply ◽  
Water Leakage ◽  
Water Supply Network ◽  
Strategic Policies

The existence of leakage in the urban water supply network can be considered one of the main challenges in the country’s water industry. The purpose of this study is a comparative comparison of water leakage management patterns in Tokyo and Tehran. In this study, the existing documents in the field of water leakage management in both cities were collected, classified, and evaluated. A comparison at the level of preventive measures showed that the city of Tokyo has a conceptual model (with an effective water ratio of more than 98%) with «corrective» subdivisions including old network management and providing solutions for maintenance and repair of the current network and also subdivisions including «technology development» and «education.» However, in Tehran, due to financial constraints, the preventive approach (PM11) is entirely passive, and emergency maintenance (EM2) units usually enter into operation after the incident. Operational comparisons showed that the Tokyo Water Leakage Control System consists of two main parts: “continuous monitoring” and “measures commensurate with the type of challenge” and is based on strategic policies. In Tehran, the movement towards using new technologies to control leakage in urban water supply networks has been significant; However, these measures are not based on a plan and have created unbalanced growth in this regard.

EXPONENTIATED HALF-LOGISTIC LOMAX DISTRIBUTION WITH PROPERTIES AND APPLICATION

2019 ◽  
Vol XVI (2) ◽  
pp. 1-11
Author(s):  
Farrukh Jamal ◽  
Hesham Mohammed Reyad ◽  
Soha Othman Ahmed ◽  
Muhammad Akbar Ali Shah ◽  
Emrah Altun
Keyword(s):  
Real Data ◽  
Continuous Model ◽  
Model Parameters ◽  
Data Set ◽  
Lomax Distribution ◽  
Mathematical Properties ◽  
Proposed Model ◽  
Probability Weighted Moment ◽  
Record Statistics ◽  
Maximum Likelihood Criterion

A new three-parameter continuous model called the exponentiated half-logistic Lomax distribution is introduced in this paper. Basic mathematical properties for the proposed model were investigated which include raw and incomplete moments, skewness, kurtosis, generating functions, Rényi entropy, Lorenz, Bonferroni and Zenga curves, probability weighted moment, stress strength model, order statistics, and record statistics. The model parameters were estimated by using the maximum likelihood criterion and the behaviours of these estimates were examined by conducting a simulation study. The applicability of the new model is illustrated by applying it on a real data set.

Groundwater pumping modeling for the sustainable management of urban water supply in Faisalabad city, Pakistan

2021 ◽  
Vol 14 (6) ◽  
Author(s):  
Abdul Khaliq ◽  
Ahsan Maqbool ◽  
Husnain Tansar ◽  
Allah Bakhsh ◽  
Muhammad Saeed ◽  
...  
Keyword(s):  
Water Supply ◽  
Sustainable Management ◽  
Urban Water ◽  
Urban Water Supply ◽  
Groundwater Pumping
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