Papers by Bahareh Pirzadeh
International journal of environmental science and technology, May 15, 2024
International Journal of Modern Physics C
Computers and Electronics in Agriculture, May 1, 2021
Journal of Water and Wastewater; Ab va Fazilab ( in persian ), Jan 20, 2021
One of the most important results of hydraulic and hydrological modeling of the urban drainage ne... more One of the most important results of hydraulic and hydrological modeling of the urban drainage network is hydrograph estimation. Annual journals on hydraulic and hydrological problems, especially in developing countries, are full of missing data, discrete and continuous gaps in most hydrological data, such as inlet flow and other series of flow data. This is due to reasons such as not registering statistics, deleting wrong statistics, or failure of measuring devices. The present paper attempts to investigate the flow rate of wastewater entering the sewage treatment plant (STP) for pumping station planning. The novelty of the research is using the Monte Carlo method, which is one of the simulators of the effect of the uncertainties in the timing and cost of the project, and Fourier series regression model to randomly generate data. These methods were used to simulate a 1-minute time scale of sewage flow data for Zahedan. Considering the construction of the treatment plant in the last decade, this is the first research with this approach in this treatment plant. The results indicate that, this method has been successful in estimating sewage flow data in the hourly and minute intervals. Finally, 270 days of flow data were obtained from a time interval of one minute with two methods of distribution: Lognormal function and a nonlinear Fourier series. Among these two methods, Fourier series' accuracy was higher in terms of statistical indicators. In this simulation, RMSE, d, CI and EF values for Fourier regression model are 0.29, 0.99, 0.99, and 0.99, respectively.
Chemical Engineering Research & Design, 2021
Abstract The reliability of pumping stations is of great importance for the robust design of wast... more Abstract The reliability of pumping stations is of great importance for the robust design of wastewater networks. In order to strike a balance between safe design and energy consumption of the pumping system, a complex performance function using multiple-failure mode under various uncertainties is required. In the present research to evaluate the failure probability of wastewater pumping station, a hybrid reliability analysis framework using artificial neural network (ANN) coupled by moment methods is proposed. Drawing upon genetic algorithm (GA), ANN model is trained to approximate the failure domain of the pump. The ANN is approximated input variables captured by the optimal condition of the rotational speed of the pump in turn it is obtained by GA. The main strength of the reliability method is to diminish the computational burden with accurate predictions of safety margin in the pumping systems of Zabol. The machine learning-based backpropagation (BP) for training feedforward neural networks using GA and gradient methods are compared for the regressed process of ANN models. This hybrid reliability framework involves three main levels including i) the pump rotational speed is minimized using GA as optimal hydraulic parameters such as inlet flow, static head, pumping head and outlet flow rate, ii) the limit sate function is approximated using ANN for optimal rotating speed pumps and iii) reliability analysis is disused using MCS and method of the moment for sewage pumping stations located at Zabol (Iran) station. Given the results, the machine learning-based GA for training ANN model provides accurate predictions compared to the ANN-based gradient method. Three moments of reliability method is an efficient and accurate approach to evaluate the reliable conditions of the pumping system.
Journal of Hydroinformatics
This paper proposes a novel energy-balanced numerical scheme for the two-layer shallow water equa... more This paper proposes a novel energy-balanced numerical scheme for the two-layer shallow water equations (2LSWEs) that accurately captures internal hydraulic jumps without introducing spurious oscillations. The proposed scheme overcomes the problem of post-shock oscillations in the 2LSWE, a phenomenon commonly observed in numerical solutions of non-linear hyperbolic systems when shock-capturing schemes are used. The approach involves reconstructing the internal momentum equation of 2LSWEs using the correct Hugoniot curve via a set of shock wave fixes originally developed for single-layer shallow water equations. The scheme successfully preserves all stationary solutions, making it highly suitable for simulations of real-life scenarios involving small perturbations of these conditions.
Water Supply
The attention of researchers and engineers has been attracted to gabion weirs due to their enviro... more The attention of researchers and engineers has been attracted to gabion weirs due to their environmental, hydraulic, and stability capabilities compared with solid weirs. One of the possible problems of the weirs is the partial blockage caused by sedimentation upstream of them. This research experiment investigates the hydraulic performance of gabion broad-crested weirs (GBCWs) with an upstream partial blockage. For this purpose, a total of 147 experiments were studied with different conditions for free-flow conditions. The weirs were tested with five partial blockage conditions between 0% and 100% of the weir height (0, 0.25P, 0.5P, 0.75P, and P). The results showed that increasing the partial blockage decreases the discharge coefficient. The changes in the discharge coefficients are minor for partial blockage less than 0.25P, and for partial blockage greater than 0.5P, the discharge coefficients are significantly reduced. As the partial blockage increases, the effect of filling-ma...
مجله پژوهش های مهندسی آب ایران, 2022
This research focuses on the rotational speed of the pump and the frequent pattern of inlet flow ... more This research focuses on the rotational speed of the pump and the frequent pattern of inlet flow rate. For this purpose, an optimization method for setting up a pump in a sewage pumping station under variable inlet flow was presented and a random model was calibrated on real data to generate inlet flow patterns and several system conditions. Also, an optimization model based on genetic algorithm and neural network was used to minimize the energy required for pumping. Based on the optimal method taken from the genetic algorithm, the energy required for pumping was optimized. Optimal design data including pumping flow, inlet flow, static height and pumping height were developed as the input of the neural network model to simulate the pump cycle speed. Using data from genetic algorithm and neural network models, the amount of optimized energy and pump efficiency were calculated.
Journal of Hydrosciences and Environment, 2020
Gravity current is the flow of fluid through another fluid of varying density. This flow often oc... more Gravity current is the flow of fluid through another fluid of varying density. This flow often occurs in nature. For optimal management of water resource quality, it is necessary to know and study the gravity current. Naturally, many streams have a meandering path. There are also many blocks in different shapes (both natural and artificial). Therefore, in the present study, to control a lock-exchange gravity current, a triangular, rectangular, or trapezoidal rigid barrier was placed inside a curved channel with a curvature of 120 degrees and a radius (R) of one meter. Simulations were performed using the OpenFoam open-source software and the realizable k-ɛ turbulence model. The Reynolds number was 19700 in all of them. According to previous studies, in a block-free channel, the most secondary current occurs in the middle of the curve. In this study, to control the secondary current, the blocks were placed at 60 degrees of the curve. With an impediment, the secondary current was visible in the body and tail of the current but did not occur in the current head. The obstacle affected the pattern of the secondary currents so that the pattern was different around the block from the other locations. The barrier also reduced the spanwise velocity of the flow body. The concentration was maximum at the head of the stream, indicating that the barrier could affect the concentration along the stream so that the maximum concentration was behind the block. The current head was also affected by the block, as it did not advance for a moment on the inner bank; at these moments, the outer bank surpassed the inner bank.
Wastewater Treatment [Working Title]
Water is a valuable material. Water used to dispose of nature or enter the consumption cycle requ... more Water is a valuable material. Water used to dispose of nature or enter the consumption cycle requires disinfection and purification to conserve water resources as well as to provide drinking water. Different processes are carried out on the water to increase water quality as much as possible. In general, the filtration process can be divided into two general categories. In the first process, harmful substances are removed from the water. In the second group, the processes are specifically designed to improve the quality and control parameters such as the pH value. The stages of water purification can be divided into different steps more in detail, which physical purification is one of these steps and has been discussed in this chapter.
International Journal for Numerical Methods in Fluids, 2022
tanks are one of the main parts of treatment plants and different parameters are effective in the... more tanks are one of the main parts of treatment plants and different parameters are effective in the settling tank performance. In this study effects of some of these parameters such as the situation of the inlet opening as well as the existence and position of baffles in the tanks are investigated. 2D numerical simulations of primary settling tanks are carried out using 2D Fluent software and the best position for the inlet to enhance the their performance found to be in the middle of the tank with optimum size of the baffle about 30% the height of settling tank at a distance about 5-10% settling tank's length.
فرایندهای غشایی از جمله مهمترین روشهای جداسازی هستند که در تصفیه آب و فاضلاب مورد استفاده قرار ... more فرایندهای غشایی از جمله مهمترین روشهای جداسازی هستند که در تصفیه آب و فاضلاب مورد استفاده قرار میگیرند. غشاهای الیاف توخالی بهدلیل داشتن نسبت سطح به حجم بالا در بسیاری از فرایندهای جداسازی استفاده میشوند. با توجه به اینکه تخلخل و نفوذپذیری محیط متخلخل به مشخصات هندسی آن بستگی دارد، تغییر در هندسه محیط، باعث تغییر در مقدار و عملکرد تخلخل و نفوذپذیری میشود. در این پژوهش، مدلسازی ریاضی بر اساس هندسه الیاف، به سه دسته دایروی، مربعی و بیضوی تقسیمبندی شد و مشخصات هندسی آنها بر اساس سه استراتژی محاسبه شد. بهمنظور بررسی اثر مورد نظر، محیط شامل الیاف توخالی، بهصورت یک محیط دومتخلخله در نظر گرفته شد. نتایج نشان داد که نسبت سطح به حجم غشای الیاف توخالی و نفوذپذیری محوری در هندسههای مربعی و بیضوی، از الیاف دایروی معمول بزرگتر بوده و به ترتیب تا حداکثر 27 و 63 درصد افزایش یافته است. همچنین هم ارزی شعاع دایره محاطی هندسه جدید با شعاع داخلی الیاف معمولی برای همه الیاف، از دایره کمتر بود که نتیجه مطلوبی است و باعث کاهش انرژی مصرفی و هزینه بهرهبرداری از سیستم میشود.
Environmental Science and Pollution Research, 2021
The longitudinal dispersion coefficient (LDC) of river pollutants is considered as one of the pro... more The longitudinal dispersion coefficient (LDC) of river pollutants is considered as one of the prominent water quality parameters. In this regard, numerous research studies have been conducted in recent years, and various equations have been extracted based on hydrodynamic and geometric elements. LDC’s estimated values obtained using different equations reveal a significant uncertainty due to this phenomenon’s complexity. In the present study, the crow search algorithm (CSA) is applied to increase the equation’s precision by employing evolutionary polynomial regression (EPR) to model an extensive amount of geometrical and hydraulic data. The results indicate that the CSA improves the performance of EPR in terms of R2 (0.8), Willmott’s index of agreement (0.93), Nash–Sutcliffe efficiency (0.77), and overall index (0.84). In addition, the reliability analysis of the proposed equation (i.e., CSA) reduced the failure probability (Pf) when the value of the failure state containing 50 to 6...
Water Science and Technology, 2018
Hollow fiber (HF) membranes with circular geometry, are used in many separation processes such as... more Hollow fiber (HF) membranes with circular geometry, are used in many separation processes such as water and wastewater treatment. Since optimization of energy efficiency is important for wastewater treatment, the aim of this study was to investigate the effect of non-circular geometry of the inner surface of the HF on the separation performance. To this purpose, the HF bundle has been assumed as a double porous media having two porosities and permeabilities. Since these two parameters are defined by the geometry of the porous medium, any change in the geometry affects their values and the media performance. Therefore, in this study a mathematical modeling has been divided into five categories, including circular, oval, square, rectangular and triangular geometries, and their geometric properties have been calculated based on three different strategies. The results have been compared with the data obtained from literature and showed that the membrane inner surface to cross-section ar...
Detection and monitoring water resources is one of the principal steps in quality management of w... more Detection and monitoring water resources is one of the principal steps in quality management of water resources. This is more critical in Sistan and Baluchestan province located in a hot and dry area with large deficiency in exploitable water resources. The aim of this study was to predict no-trend quality parameters in Chahnime No.1 using neural network and comparing it with Markov chain method. In the present study some parameters such as DO, temperature, Phytoplankton, Zooplankton, Ammonia, and Phosphorus have been considered. The mean error percentages in neural network method for these parameters were 5.5, 7.7, 12.8, 5.6, 52.4, and 4.1, respectively. In comparison, the mean error percentages of Markov chain scheme were respectively 11.2, 8.9, 5.3, 12.9, 33.9, and 8.4. The results showed that neural network method provided better results compared to Markov chain method.
Abstract: This paper provides detail application of FLUENT-2D software in simulation of lateral i... more Abstract: This paper provides detail application of FLUENT-2D software in simulation of lateral intake flows. Numerical simulations undertaken in present two dimensional work use RSM turbulent model. Results for dimensions of separation zone were compared with Kasthuri and Pundarikanthan (1987) that a good agreement is found between them.
Comput. Electron. Agric., 2021
This paper provides detail application of FLUENT-2D software in simulation of lateral intake flow... more This paper provides detail application of FLUENT-2D software in simulation of lateral intake flows. Numerical simulations undertaken in present two dimensional work use RSM turbulent model. Results for dimensions of separation zone were compared with Kasthuri and Pundarikanthan (1987) that a good agreement is found between them.
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Papers by Bahareh Pirzadeh