Ali Haghighi

Ali Haghighi
Shahid Chamran University of Ahvaz | scu · Department of Civil Engineering (Ahvaz)

Professor

About

97
Publications
25,163
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,193
Citations
Introduction
My research focuses on the design and operation of civil engineering systems. I am interested in mathematical modeling and optimization of water supply and sewer networks. Currently, we are trying to exploit machine learning techniques for developing knowledge-based models for the design and operation of urban water systems.
Additional affiliations
January 2012 - present
January 2010 - present
Khaje Nasir Toosi University of Technology

Publications

Publications (97)
Article
Full-text available
The operation of pumps imposes significant costs on a water distribution system for energy supply and pumps maintenance. To derive an optimum pumps scheduling program, this study presents a multiobjective optimization problem with the objective functions of 1- energy cost and 2- the number of pump switches. The optimization of both objective functi...
Chapter
Design of a wastewater collection network is consisting of (1) generating the network’s layout and (2) sizing its hydraulic components. These two sub-problems are nonlinear and discrete in nature and include many complex constraints from hydraulics, technical criteria and regional limitations. This chapter introduces a comprehensive sewer design mo...
Article
Full-text available
In water-supply pipe networks, inherent uncertainties in the analysis parameters, including nodal demands, pipe friction factors, reservoir heads, etc., lead to imprecise hydraulic responses. This study introduces a methodology based on fuzzy set theory to analyze network hydraulics under uncertainty. The fuzzy approach results in a complex optimiz...
Article
This paper presents an integrated optimization model for designing sewage collection networks. The layout configuration is designed using the loop by loop cutting algorithm. Then, the network with a given layout is hydraulically designed to determine sewer diameters, installation depths and pump specifications. In both design steps all technical co...
Article
The design of urban drainage systems consists of solving two subproblems: (1) generating the layout and (2) sizing the sewers. The latter includes pipe diameters, installation depths, and pumping facilities, all of which are significantly influenced by the layout configuration. This work aims at introducing a method to solve the layout subproblem b...
Article
Full-text available
Recent research underpinned the effectiveness of topological decentralization for urban stormwater networks (USNs) during the planning stage in terms of both capital savings and resilience enhancement. However, how centralized and decentralized USNs’ structures with various degrees of redundancy (i.e., redundant water flow pathways) project resilie...
Article
Full-text available
This study introduces a general framework for real-time leak detection in pipelines by coupling machine learning to transient hydraulics. In this framework, the performance of Support Vector Machines (SVM) as a superior pattern recognition algorithm is investigated in the experimental condition. First, a transient simulation model using the Method...
Article
Full-text available
The suitability and effectiveness of decentralized paradigms in the field of underground conveyance drainage infrastructures for coping with the current and upcoming sustainability and resilience demands has been documented in recent research. However, a generic and holistic framework that can be quickly put in practice is lacking. To this end, thi...
Conference Paper
Full-text available
• An optimization approach is introduced to design combined sewer networks. • Sewer network layout and hydraulic specifications alongside the size, location, and operation of combined sewer overflow structures are optimized simultaneously. • Combined sewer networks are well-suited to hot and dry climates, specifically for low-budget and crowded cit...
Conference Paper
Full-text available
• We investigated the potential of GANs in the field of urban water management. • As proof of concept, GAN is used to generate synthetic time series to improve the accuracy of data-driven combined sewer flow prediction models • The time series generated by GAN look quite genuine even on the first try, and still, significant improvement can be achie...
Article
This study introduces a novel hybrid leak detection method based on machine learning and hydraulic transient modeling for pipe networks. First, the transient hydraulic simulation model is developed in the time domain. Then, the optimum measurement sites for sampling the network's hydraulic responses are determined using a graph-based method. The mo...
Conference Paper
This study aims at introducing a general framework for leak detection in pipelines by coupling machine learning to transient hydraulics. For this purpose, the Support Vector Machine (SVM) as a superior pattern recognition algorithm is applied to transient-based leak detection problems. First, a transient simulation model based on unsteady friction...
Preprint
This study introduces a two-stage approach for high-resolution leak localization in large-scale pipelines by coupling machine learning to transient hydraulics. The method includes two stages of leak zone identification and in-zone Leak detection. A transient simulation model using the Method of Characteristics (MOC) is developed to generate the lea...
Article
Full-text available
Flood impact assessment in a river system is done with the help of flood routing and this process helps to determine the status of sensitive points of the route in terms of flood entry and the resulting risks for urban and rural areas. For flood routing a hydrodynamic numerical model should be implemented and this model needs upstream and downstrea...
Poster
Full-text available
All dear professors, students and other scholars in the field of water science and engineering are cordially informed that the Journal of Hydraulic Structures (JHS), as one of the leading Iranian English-language journals dedicated to the field of water science and engineering, has been launched with the cooperation and support of the Iranian Hydra...
Poster
Full-text available
All dear professors, students and other scholars in the field of water science and engineering are cordially informed that the Journal of Hydraulic Structures (JHS), as one of the leading Iranian English-language journals dedicated to the field of water science and engineering, has been launched with the cooperation and support of the Iranian Hydra...
Article
Full-text available
In recent years, the concept of a centralized drainage system that connect an entire city to one single treatment plant is increasingly being questioned in terms of the costs, reliability, and environmental impacts. This study introduces an optimization approach based on decentralization in order to develop a cost-effective and sustainable sewage c...
Article
Full-text available
This study aims to introduce a generic solution in the context of a multicriteria decision making (MCDM) platform to (1) facilitate the optimization of hybrid (de)centralized urban drainage infrastructures with many decisions and often conflicting objectives (reliability, resilience, sustainability, and construction costs); (2) investigate the trad...
Article
Full-text available
The Reverse Osmosis (RO) input parameters have key roles in mass transport and performance indicators. Several studies can be found in open literature. However, an experimental research on evaluating the brackish water RO input parameters influence on the performance metrics with justifying the interference between them via a robust model has not b...
Article
Today, water desalination methods are of great importance in solving the freshwater crisis in the world, so that in recent years, the world's water desalination capacity has increased dramatically. Among them, the reverse osmosis membrane technology has been the most popular and used. There are problems such as high energy consumption, high operati...
Preprint
Flood routing in flood forecasting issue, calculation the height of flood bands, determining the river boundaries, and estimation of protective facilities for flood –exposed building is applicable. In many cases, due to the lack of measuring stations, the status of the upstream flood generating hydrograph is not known. The purpose of this study is...
Article
Full-text available
Structural resilience describes urban drainage systems' (UDSs) ability to minimize the frequency and magnitude of failure due to common structural issues such as pipe clogging and cracking or pump failure. Structural resilience is often neglected in the design of UDSs. The current literature supports structural decentralization as a way to introduc...
Article
Full-text available
The leak detection parameters in the inverse transient analysis (ITA) are obtained in an inverse approach by solving a nonlinear programming problem using metaheuristic algorithms such as the genetic algorithm (GA). Despite its high capability in deriving the leak detection parameters, the ITA method is computationally complex and costly as it uses...
Conference Paper
Today, water desalination methods are of great importance in solving the freshwater crisis in the world. Among them, the reverse osmosis membrane technology has been the most popular. Water and salt permeability coefficients of the membrane are important parameters that affect the design and optimal performance of reverse osmosis processes and ther...
Conference Paper
The present study deals with the issue of leak detection in water distribution networks through the machine learning approach and transient flow analysis. This research aims to present a machine learning-based method that uses the information content of transient response signals to address several issues in existing machine learning-based leak det...
Article
The inverse transient analysis (ITA) is a well-known leak detection method for pressurized piping systems. In this method, unknown parameters of the number, location, and size of leakages are obtained through solving a nonlinear programming problem using an optimization technique. Both transient analysis and optimization are time consuming and make...
Article
This paper provides a mathematical simulation model for the reverse osmosis (RO) process with series elements. A mathematical simulation model was developed based on the mass, material and energy balances considering the concentration polarization. The simulation model is open-source and easy to couple with other computational tools like optimizati...
Article
Full-text available
The inverse transient analysis (ITA) method is amongst the successful leak detection methods in water distribution networks. However, determining the unknown leakage parameters such as number, location, and area of leakages is computationally time-consuming and costly due to applying metaheuristic algorithms, like the genetic algorithm (GA). This s...
Article
Full-text available
This paper presents some developments in the optimization effectiveness for the dynamic design of water distribution networks (WDNs), tackled employing multi-objective genetic algorithms. Unlike the traditional single-phase design, the dynamic multi-phase design operates on planning WDN upgrades on short time intervals, also called phases or stages...
Article
Full-text available
Optimal water allocation may be considered a valuable solution to increase the productivity of water resources in arid and semi‐arid areas. To achieve this purpose, the main resources of water consumption in the Baghmalek Plain (Khuzestan Province) from October 2014 to September 2015 and the groundwater table for 12 years (2002–2014) were simulated...
Thesis
Maintenance and operation maintenance of equipment is a critical factor in the industry world. In this regard, the preventive maintenance examines the equipment by adopting maintenance techniques and with a specific schedule in accordance with a predetermined maintenance plan Service or replacement. In this thesis, we use mean elapsed time between...
Article
Full-text available
The rapid population growth and urban development have notably influenced the role of water distribution networks (WDNs) compared to the past. This issue encourages operators to adopt new smart tools to better system management. Such a smart system is expected to play an effective role in both crisis and normal services. For fire extinguishing serv...
Article
Recent studies suggested hybrid green-blue-gray infrastructures (HGBGI) as the most promising urban drainage systems that can simultaneously combine reliability, resilience, and acceptability of gray infrastructures (net-works of pipes) with multi-functionality, sustainability, and adaptability of green-blue infrastructures (GBI). Combining GBI and...
Article
Full-text available
Optimum design of a water distribution network leads to a nonlinearly constrained problem that is inherently discrete and multimodal. The penalty function approach is traditionally used to handle the problem constraint. Constraint violations are directly added to the objective function by applying the penalty functions. Penalty functions and coeffi...
Article
Full-text available
The accuracy of leak detection and calibration of pipe networks by means of the inverse transient analysis (ITA) is highly affected by the number and location of the measurement sites. This study introduces a conceptual decision-making model, the Decision Table Method (DTM), for measurement site design of pipe networks with the aim of inverse trans...
Article
Full-text available
Traditional urban drainage systems rely heavily on centralized network-based infrastructures. Recently, the idea of centralized urban drainage networks has increasingly been questioned. The latest investigations suggest a transition from centralized to decentralized or hybrid schemes. Therefore, there is a need for tools and methodologies to evalua...
Article
For modeling the transient flow in a pipeline by Frequency Response Method (FRM), the nonlinear terms of the governing equations and boundary conditions should be linearized. Significant nonlinearities are associated with the steady friction and valve equations. This study reviews the FRM and its range of validity in accordance with the linearizati...
Article
Full-text available
Today, pipe systems are the most common facilities to convey various fluids from one place to another. In such facilities faults like leaks lead to advert consequences such as economic losses and social health threats. The fact that early detection of leaks can play a prominent role in reducing the amount of these undesired impacts has absorbed not...
Article
The seismic bearing capacity of shallow strip footings located on homogeneous soils is studied extensively. But the effect of building height and layering is not included in those studies. In this paper two-layered cohesive soils are studied along with building height effect. The formulation of the problem is derived by extending the limit equilibr...
Article
The gypsiferous soils are significantly sensitive to moisture and the water has a severe destructive effect on them. Therefore, the effect of lime and silica fume addition on their mechanical properties, when subjected to water, is investigated. Gypsiferous soil specimens were mixed with 1, 2 and 3% lime and 1, 3, 5 and 7% silica fume, in terms of...
Article
In watersheds that have not sufficient meteorological and hydrometric data for simulating rainfall-runoff events, using geomorphologic and geomorphoclimatic characteristics of watershed is a conventional method for the simulation. A number of rainfall-runoff models utilize these characteristics such as Nash-IUH, Clark-IUH, Geomorphologic Instantane...
Article
This study introduces a decision support system for upgrading aged water distribution mains. The network hydraulics is simulated and evaluated by a hybrid reliability measure, and the design period is divided into multiple upgrade phases. In each phase, a multiobjective optimization problem is solved to derive the trade-off between construction cos...
Article
Full-text available
Water resources systems should be operated to balance multiple conflicting objectives accounting for a variety of services. In this field, the evolutionary algorithms are very helpful since complex simulation models can be directly embedded within them, and they are also powerful for deriving the trade-off among conflicting objectives in multi-obje...
Conference Paper
Full-text available
The rapid growth of the human population in cities and villages, along with industrial and agricultural development, have increased water demand more than ever in societies. On the other hand, countries have faced several challenges due to a reduction in the amount of groundwater as well as the contamination of available water resources. These issu...
Article
Full-text available
For transient analysis of a pipe network, the unsteady flow governing equations should be solved to obtain the extreme pressure heads in the system, which may be faced with several uncertainties. To evaluate that to what extent the input uncertainties can affect the system responses, a simulation model based on the fuzzy sets theory is introduced....
Chapter
Full-text available
Recently, the implementation of centralized urban drainage networks, has increasingly been questioned. The main reasons are the lack of capital especially in developing countries, environmental-ecological concerns, the risk of failure, rapid change and high uncertainty in a developing country context. Latest investigations suggest a transition from...
Article
Full-text available
The seismic bearing capacity of shallow strip footings located on homogeneous soils is studied extensively. But the effect of building height and layering is not included in those studies. In this paper two-layered cohesive soils are studied along with building height effect. The formulation of the problem is derived by extending the limit equilibr...
Article
The Inverse Transient Analysis (ITA) is a well known method for leakage detection and calibration of pipe networks. To reduce the problem dimensionality as well as to allocate candidate leakages everywhere in the network and to handle the simulation and measurement uncertainties, it is assumed that a leakage has a quasi-normal distribution around i...
Article
Full-text available
Hydraulic analysis of pipe networks is generally done considering certain values for independent parameters of the system such as roughness of pipes, nodal demands, etc. Such analysis would inevitably lead to certain hydraulic responses of the system, i.e. nodal pressures, etc. This is while, inherent uncertainties associated with independent param...
Article
Full-text available
First, the writers would like to thank the discussers for reading the paper carefully and raising such technical comments. The writers welcome the discussion and believe that it is useful for clarifying the subject. The uncertainty analysis of a water distribution network tackles the problem of finding the extreme values of the system responses inc...
Preprint
Full-text available
This study introduces a dynamic phase by phase optimization model for upgrading of aged water supply networks. For this purpose, the network hydraulics is simulated and its hydraulic performance is evaluated by a reliability measure. The design period is divided into multiple upgrading phases so that, in each phase a multi-objective optimization is...
Conference Paper
Full-text available
The sewer layout in flat areas significantly influences the construction and operational costs as well as reliability of the network performance. To find an optimum design of sewer networks for flat areas, this study presents a multiobjective optimization problem with the objective functions of 1- the cost and 2- the reliability. The reliability cr...
Conference Paper
Full-text available
Water distribution networks (WDNs) are of crucial infrastructures required to satisfy urban water needs with desirable quality and quantity. The hydraulic performance of each WDN is highly affected by uncertainty in the system’s parameters such as nodal demands and pipe friction factors. The input uncertainties are spread out over the system and in...
Article
Full-text available
Transient flows naturally occur in piping systems due to operation exigencies. It is، therefore، essential to analyze water distribution networks under transient flow conditions in an attempt to enhance their reliability. The accuracy of such an analysis highly depends on such input parameters as pipe wall roughness، wave speed، and unsteady fricti...
Article
Transient protection is an important issue in pipeline design. As protective devices impose a huge cost on the project, it is better and more efficient to use optimization models for determination of their position and type with the aim of cost reduction. Except for the cost, the other important issue in obtaining the number and locating of protect...
Article
Full-text available
This paper investigates the frequency response method (FRM) for analyzing waterhammer phenomenon in looped pipe networks. Traditionally, the unsteady flow governing equations are solved in the time domain using the method of characteristics (MOC). The governing equations can also be solved in the frequency domain using the transfer matrix method. F...
Article
This paper presents a framework for the optimal design of a storm sewer network in flat areas where there is insufficient energy from gravity for runoff drainage. A reliability index based on nodal partial flooding is introduced as a performance criterion and utilizes the intrinsic storage capacity of the sewer network. The Storm Water Management M...
Conference Paper
Full-text available
Deterioration of water distribution mains has become one of the most important challenges in many cities worldwide. These mains should be reclaimed, strengthened and replaced through various techniques. in the circumstances of replacement, pipes can be replaced in two ways of open-cut or trenchless. Trenchless technology involves a variety of techn...
Article
Air-chambers are mechanical devices capable of decreasing positive and increasing negative water-hammer pressures in pumping pipelines; however, large size air-chambers might increase the costs substantially. Also, air-inlet valves are powerful devices which can efficiently control negative pressures. Obtaining the best protection scheme where tran...
Article
Full-text available
A multiobjective programming model is proposed for optimal allocation of surface and groundwater resources under water deficits in arid and semiarid regions. This paper considers a biobjective problem in water allocation to agricultural areas by using a nondominated sorting genetic algorithm (NSGAII) as a multiobjective optimization method. Accordi...
Article
Full-text available
This paper introduces a methodology for soil slope stability analysis based on optimization, limit equilibrium principles and method of slices. In this study, the slope stability analysis problem is transformed into a constrained nonlinear optimization problem. To solve that, a Self-Adaptive Genetic Algorithm (GA) is utilized. In this study, the sl...
Article
This study introduces a simulation-optimization model for deriving an operating policy for multireservoir systems. Two adjustable monthly rule curves are introduced to each reservoir in the system. The applied rule curves divide the reservoir volume into three zones in each within-year period. For each zone, a release coefficient is specified to in...
Article
Full-text available
In this research, a flood control operation policy based on a simulation–optimization model is developed for minimizing flood damage downstream of multi-reservoir systems by using spillway gates. The operation policy is based on a multistage method used to control floods of various magnitudes in reservoirs with gated spillways. In this operation po...
Conference Paper
Full-text available
Together with growth in population and urban expansion, water distribution networks should be upgraded. In the traditional design of WDNs, the assumption is that the network layout on the planning horizon arises in year zero, while in reality, the expansion of cities is done gradually through the phasing of construction. Considering this fact in th...
Article
Full-text available
Uncertainties in the analysis and design parameters of a gravity dam are spread out over the system and make the stability safety factors uncertain too. To analyze the effects of such uncertainties on the dam performance, a conceptual model based on the fuzzy sets theory is introduced here. The input uncertainties are simulated by triangular fuzzy...
Article
Full-text available
Inverse Transient Analysis (ITA) is a powerful approach for leak detection of pipelines. When the pipe transient flow is analyzed in frequency domain the ITA is called Inverse Frequency Response Analysis (IFRA). To implement an IFRA for leak detection, a transient state is initiated in the pipe by fast closure ofthe downstream end valve. Then, the...