Article
Water Resources
Abbas Parsaie, Saleh Jaafer Suleiman Shareef, Amir Hamzeh Haghiabi, Raad Hoobi Irzooki, Rasul M. Khalaf
Summary: This paper explores the hydraulic properties of a new type of spillway with a circular crest through numerical investigation. Results indicate that the spillway is effective in dissipating flow energy and the flow streamlines are tangential to the curvature of the crest.
APPLIED WATER SCIENCE
(2022)
Article
Computer Science, Interdisciplinary Applications
Mehdi Karami Moghadam, Ata Amini, Ehsan Karami Moghadam
Summary: The research investigated the accuracy of the Flow-3D numerical model in flow simulation in a stepped spillway and the impact of block barriers on energy dissipation rate. Different turbulent models were employed with similar outcomes observed. The relative energy dissipation was found to be influenced by the length and ratios of block barriers, with shorter blocks at low ratios showing more energy dissipation.
JOURNAL OF HYDROINFORMATICS
(2021)
Article
Engineering, Multidisciplinary
Mohammad Alkhamis, Saeed Reza Sabbagh-Yazdi, Mohsen Ranjbar-Malekshah
Summary: This paper investigates the challenges in the design of morning glory spillways by mapping variable size steps downstream for energy dissipation and water flow aeration. A finite volume base numerical flow solver is used to study the effects of these configurations on hydraulic design parameters. The alternative stepped morning glory spillway options are numerically simulated for various flow rates to compare discharge coefficients and energy dissipations with the ordinary spillway design.
JOURNAL OF ENGINEERING RESEARCH
(2021)
Article
Computer Science, Interdisciplinary Applications
Kiyoumars Roushangar, Samira Akhgar, Saman Shahnazi
Summary: The study found that installing triangular prismatic elements on stepped spillways can effectively reduce cavitation effects, increase energy dissipation rate, and improve performance. Closer spacing of TPEs leads to better results in stepped spillways.
JOURNAL OF HYDROINFORMATICS
(2022)
Article
Engineering, Civil
Ali Foroudi, Kiyoumars Roushangar, Mojtaba Saneie, Fatemeh Vojoudi Mehrabani, Farhad Alizadeh
Summary: In this study, a 3D physical model based on the Germi-Chay dam was developed to assess the impact of downstream channel width variation on the efficiency of arched plan stepped spillways. The experiments showed that downstream channel width variations had no significant impact on the discharge coefficient in the submergence state, but resulted in a decrease in static pressure and influenced energy dissipation. The most efficient model was found to have a width ratio of 0.286.
WATER RESOURCES MANAGEMENT
(2022)
Article
Engineering, Civil
Eyyup Ensar Yalcin, Erdinc Ikinciogullari, Nihat Kaya
Summary: The suitable turbulence model for computational fluid dynamics (CFD) analysis in hydraulic engineering and other sciences needs to be determined. This study investigates different turbulence models (k-epsilon, k-omega, large eddy simulation [LES], renormalization group [RNG]) to determine which one is closer to the actual data in calculating parameters commonly encountered in CFD engineering such as velocity, water surface profile, and pressure. The results show that k-omega is the most compatible turbulence model for the discharge-water level relationship, k-epsilon is the most compatible for pressure, energy dissipation rates, and approach channel velocities, and LES is the most compatible for water surface profiles. These findings serve as a reference for future researchers in this field.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Xin Ma, Jianmin Zhang, Yaan Hu
Summary: The water flow characteristics of an interval-pooled stepped spillway were investigated using the RNG k-epsilon turbulence model and the VOF interface capture technique. The results showed that the energy dissipation performance of the interval-pooled stepped spillway was better than other types, and the average vortex intensity can be used to evaluate the energy dissipation.
Article
Environmental Sciences
Amir Ghaderi, Saeed Abbasi, Silvia Di Francesco
Summary: This study conducted numerical simulations to investigate the influence of geometric characteristics of pooled steps on energy dissipation, flow patterns, velocity rates, and pressure distributions over a spillway. Results showed that the flat step configuration had the best energy dissipation performance. The efficiency performance of the pooled structure improved by about 5.8% with the notched pooled step configuration, but the pool configuration did not significantly affect the location of air entrainment.
Article
Environmental Sciences
Amir Ghaderi, Saeed Abbasi
Summary: This study focuses on the influence of geometric appendance elements on energy dissipation performance in stepped spillways. The results indicate that the addition of elements significantly increases turbulent kinetic energy and friction, leading to a more efficient energy dissipation.
Article
Engineering, Mechanical
Erdinc Ikinciogullari
Summary: In this study, trapezoidal labyrinth-shaped stepped spillways were designed and their energy dissipation rates were numerically investigated. The results showed that the two-cycle trapezoidal labyrinth step spillway had about 20% higher energy dissipation performance compared to the classical one. The effective crest length of the trapezoidal steps did not have much impact on the energy dissipation rate, and the staggered designed steps were more successful than the in-line designed ones. Additionally, more energy was dissipated at low flow rates with an increase in the number of cycles in the same magnification ratio, while the two-cycle labyrinth steps were more effective at high flow rates.
FLOW MEASUREMENT AND INSTRUMENTATION
(2023)
Article
Engineering, Civil
Omer Ekmekcioglu, Eyyup Ensar Basakin, Mehmet Ozger
Summary: This study investigates energy dissipation under the skimming flow regime using data-driven methods. Different machine learning methods are used to model the data obtained from laboratory experiments. Linear and nonlinear ensemble models are established to improve the accuracy of single models in predicting energy dissipation. The results show that tree-based ensemble models make better predictions for energy dissipation in step spillways compared to single machine learning methods.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Yu Zhou, Jianhua Wu, Fei Ma, Shangtuo Qian
Summary: In traditional stepped spillways, high unit discharge may lead to low energy dissipation and cavitation damage due to reduced air entrainment. However, a new type of stepped spillway called hydraulic-jump-stepped spillway (HJSS) has been developed to efficiently entrain air into the flow by using a hydraulic jump in the aeration basin. Experimental results show that the HJSS achieves higher energy dissipation, improved air entrainment performance, and a more reasonable pressure distribution compared to traditional stepped spillways.
KSCE JOURNAL OF CIVIL ENGINEERING
(2021)
Article
Engineering, Civil
Saman Baharvand, Reza Rezaei, Nasser Talebbeydokhti, Roohollah Nasiri, Seyed Mehrab Amiri
Summary: This study proposed a physical model of a stepped vertical overfall (SVO) spillway, discussed its hydraulic design characteristics, evaluated energy dissipation rate using laboratory experiments and machine learning methods, compared energy dissipation rate variation in different scenarios, and assessed the prediction performance of two regression algorithms. The research found that the energy dissipation rate gradually increases with relative depth inside the SVO spillway, and the random forest regression algorithm outperformed the support vector regression model in predicting energy dissipation rate.
KSCE JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Engineering, Environmental
Farzin Salmasi, John Abraham
Summary: This study proposed a stepped spillway with optimal dimensions using a genetic algorithm to replace the smooth spillway of Sarogh Dam in West Azerbaijan province, Iran. The research findings indicate that the relative energy dissipation for constant discharge is independent of the optimal height of the steps and decreases with increasing spillway slope.
Article
Environmental Sciences
Frederic Stilmant, Sebastien Erpicum, Yann Peltier, Pierre Archambeau, Benjamin Dewals, Michel Pirotton
Summary: This study derives a theoretical model of the discharge coefficient of an ogee crest, which is independent of empirical coefficients and provides accurate predictions across a wide range of head ratios. The model is validated through comparison with experimental data.
Article
Computer Science, Interdisciplinary Applications
Azam Abdollahi, Mehdi Azhdary Moghaddam, Seyed Arman Hashemi Monfared, Mohsen Rashki, Yong Li
Summary: Probability estimation of rare events is a challenging task in reliability theory. Subset simulation (SS) is a robust simulation technique that efficiently approximates rare events by transforming them into multiple intermediate failure events. Different seed selection approaches inspired by genetic algorithms and particle filters were studied to improve the accuracy of SS, with results showing promising performance in finding proper failure sets, especially in problems with multiple failure domains.
ENGINEERING WITH COMPUTERS
(2021)
Article
Engineering, Multidisciplinary
Pezhman Derakhshan Alamdarloo, Mehdi Azhdary Moghaddam
AIN SHAMS ENGINEERING JOURNAL
(2020)
Article
Engineering, Multidisciplinary
Mohammad Rashki Ghaleh Nou, Mehdi Azhdary Moghaddam, Mahmood Shafai Bajestan, Hazi Mohammad Azamathulla
AIN SHAMS ENGINEERING JOURNAL
(2020)
Article
Engineering, Multidisciplinary
Ali Poorarbabi, Mohammadreza Ghasemi, Mehdi Azhdary Moghaddam
AIN SHAMS ENGINEERING JOURNAL
(2020)
Article
Engineering, Civil
Alireza Ghavidel, Mohsen Rashki, Hamed Ghohani Arab, Mehdi Azhdary Moghaddam
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2020)
Article
Materials Science, Characterization & Testing
Ali Poorarbabi, Mohammadreza Ghasemi, Mehdi Azhdary Moghaddam
JOURNAL OF NONDESTRUCTIVE EVALUATION
(2020)
Article
Environmental Sciences
Hojat Mirani Moghadam, Gholam Hossein Karami, Rahim Bagheri, Reza Barati
Summary: This research analyzed the declining trends of flow rates of four historical Qanats in eastern Iran, attributing the factors to decreased precipitation and excessive groundwater extraction. It is suggested to reduce groundwater extraction through optimal use of water resources and restrictions on agriculture and industrial development to prevent the destruction of the Qanats.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Engineering, Civil
Meisam Badfar, Reza Barati, Emrah Dogan, Gokmen Tayfur
Summary: In this study, a reverse flood routing approach based on the Muskingum model was developed, with the use of the shuffled complex evolution algorithm for parameter optimization. The methodology significantly improved the comparison accuracy with observed inflows by up to almost 82%, and was validated in real river systems for practical applicability.
JOURNAL OF HYDROLOGIC ENGINEERING
(2021)
Article
Astronomy & Astrophysics
Mohsen Maghrebi, Roohollah Noori, Sadegh Partani, Alireza Araghi, Reza Barati, Hosein Farnoush, Ali Torabi Haghighi
Summary: The study reveals that Iran's groundwater hydrochemistry faces challenges, especially in the central, southern, and eastern regions. Groundwater quality does not meet drinking standards but is suitable for irrigation. Geological-geomorphological features play a critical role in groundwater quality in Iran.
EARTH AND SPACE SCIENCE
(2021)
Editorial Material
Engineering, Civil
Meisam Badfar, Reza Barati, Emrah Dogan, Gokmen Tayfur
JOURNAL OF HYDROLOGIC ENGINEERING
(2022)
Article
Environmental Sciences
K. Khashi, M. Azhdary Moghaddam, S. A. Hashemi Monfared
Summary: The Sistan region in Southeastern Iran has been facing the challenging issue of dust propagation, mainly caused by wind and land erosion. The study found no correlation between dust propagation and water coverage in the Saberi wetland, while highlighting a strong correlation between windy days and dusty days. Wind plays a significant role in dust emission, but its direct effect varies over time.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ali Foroudi, Reza Barati
Summary: The study examined changes in the cavitation index caused by different convergence angles of an ogee spillway's sidewalls. Results showed that as flow rate increased, the cavitation index decreased at the crest and chute of the spillway but increased at the toe.
Article
Geosciences, Multidisciplinary
Mohsen Maghrebi, Roohollah Noori, Mojtaba Sadegh, Fereshteh Sarvarzadeh, Aliasghar Erfanian Akbarzadeh, Fatemeh Karandish, Reza Barati, Hamid Taherpour
Summary: Qanat is an ancient underground structure used to abstract groundwater. However, increasing anthropogenic pressures have posed significant challenges to the preservation of Qanats. This study investigates land-use changes and the loss of Qanat shafts in the Mashhad plain, Iran, over the past six decades using remote sensing. The results highlight the declining number of intact Qanat shafts, with agriculture and urban areas being the most destructive factors. The decline in Qanat maintenance and construction industry, along with other factors, poses existential threats to these historic water structures.
Article
Engineering, Marine
Rana Muhammad Adnan, Tayeb Sadeghifar, Meysam Alizamir, Masouad Torabi Azad, Oleg Makarynskyy, Ozgur Kisi, Reza Barati, Kaywan Othman Ahmed
Summary: Accurate prediction of significant wave heights is crucial for maritime applications. In this study, a Bayesian model averaging (BMA) ensemble approach is used with three machine learning methods to predict wave heights. The performance of these methods is evaluated using daily data from three wave monitoring stations near Chabahar Bay, Gulf of Oman, for lead times of one, two, three, and six days. The results show that the BMA model performs slightly better than the other methods, especially for the six-day ahead time horizon, indicating their competitiveness in predicting significant wave heights.
Article
Thermodynamics
Seyed Mehdi Mohammadizadeh, Mehdi Azhdary Moghaddam, Naser Talebbeydokhti
Summary: A network model was implemented to study the transition of flow in porous media, using an orthogonal pipe network to simulate a real porous medium. The nodes represent existing holes and the pipes represent existing ducts in the model. The effects of hydraulic parameter variations on flow were investigated, and the accuracy of the model was specified through sensitive analyses based on several parameters, with the CPFNET method used for further analysis. The results of the CPFNET model were similar to observed experimental data.
JOURNAL OF POROUS MEDIA
(2021)
