Babak Aminnejad - Academia.edu (original) (raw)

Papers by Babak Aminnejad

Sustainability

Rivers are the main source of fresh water in mountainous and downstream areas. It is crucial to i... more Rivers are the main source of fresh water in mountainous and downstream areas. It is crucial to investigate the possible threats of climate change and understand their impact on river watersheds. In this research, climate change’s impact on the mountainous watershed of the Jajrood River, upstream of Latyan Dam in Iran, was assessed by using a multivariate recursive quantile-matching nesting bias correction (MRQNBC) and the soil and water assessment tool (SWAT). Also, this study considered ten global circulation models (GCMs) from the coupled model intercomparison project phase VI (CMIP6). With a higher correlation coefficient, the MIROC6 model was selected among other models. For the future period of 2031–2060, the large-scale outputs of the MIROC6 model, corresponding to the observational data were extracted under four common socioeconomic path scenarios (SSPs 1–2.6, 2–4.5, 3–7.0, 5–8.5). The bias was corrected and downscaled by the MRQNBC method. The downscale outputs were given t...

Construction and Building Materials, Jun 1, 2023

Zenodo (CERN European Organization for Nuclear Research), Dec 1, 2022

With the growth of the urban population and the development of cities, water distribution systems... more With the growth of the urban population and the development of cities, water distribution systems have become very important. Considering the complexity of these systems and the large scale of decision-making in analysis, design, operation and maintenance, the need for computer modelling of networks has become more important. The most important issue in modelling is consistency between calculated and measured data. The amount of unaccounted water in a distribution system can be determined by conducting water balance studies in the system or in an enclosed measurement area. It can be seen that determining the optimal pattern of unaccounted water to complete the data of total water consumption in the network in a seta model, in a situation where the results of unaccounted water studies are not available, is still needed as one of the main elements in model calibration.. In order to solve this problem, the current research was carried out in order to review and improve the continuous model of water distribution network by introducing, checking and implementing an optimal integrated experimental approach of the unaccounted water model. The use of the option of the inverse model of the customers' consumption is not considered as a water model; for calibrating the hydraulic model of the distribution network, it provided a more acceptable simulation in the maximum range from 30% to 4% and in the average maximum difference from 23% to 3%.

Journal of numerical methods in civil engineering, Mar 1, 2020

Familiarity with storm water management and how to assess damage and deal with it to minimize and... more Familiarity with storm water management and how to assess damage and deal with it to minimize and control it is very important in urban management systems. There are several methods for flood control that are considered depending on the hydraulic conditions. The use of main canals for surface water collection, flow diversion, catchment management, etc. are among the methods considered by urban designers. Meanwhile, the use of various softwares such as SSA, HEC-RAS and the use of engineering tools such as GIS in its environment has attracted the attention of many researchers. In this paper, the hydraulic studies of Mianroud canal in the area of District 5 of Tehran Municipality, which is one of the important surface drainage arteries of Tehran, have been considered with the help of mathematical model for flood risk zoning. Vulnerable areas have been identified and finally management strategies to control and reduce flood risks have been discussed according to the river regime and the conditions of the region. The results of the Mianroud canal crossing capacity at the intersection with the existing bridges show that the canal built at the site of the sixth bridge is unquestionably incapable of passing floods with a return period of ten years. The canal will be able to pass the 25-year-old flood only at the location of the second and seventh bridges and will overflow at the location of the other bridges. In the 50 and 100 year return periods, the canal will almost lose its function and will flood the surrounding areas with 100% fullness.

Information, Jan 18, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Journal of Vibroengineering, Jun 30, 2016

In order to supply the required water for purposes such as irrigation, municipal and industrial c... more In order to supply the required water for purposes such as irrigation, municipal and industrial consumptions, etc., human beings have always attempted to diverse water and construct large and small water intakes near the great rivers. Therefore, water diversion from the main path, water flow regime and the sediment transported by it change. This paper simulates the flow hydraulic in intake from the direct path of a rectangular channel and Navier-Stokes equations are solved by Finite-Volume Method (FVM) using the SSIIM2 software in which the flow velocity profiles near the surface of the water, the turbulent kinetic energy and hydrostatic pressure distribution in different sections of the main channels and intake at a constant discharge of 11 lit/sec, with the intake discharge ratio of 0.31, the inlet Froude number of 0.13 and various turbulence models were calculated in 3D mode and compared with the experimental results and there were a good agreement between the obtained values and the experimental results.

American Journal of Civil Engineering and Architecture, Oct 5, 2014

Master of civil Engineering, young researchers and elite club, roudehen branch, islamic azad univ... more Master of civil Engineering, young researchers and elite club, roudehen branch, islamic azad university, roudehen, Iran

Intelligent Automation and Soft Computing, 2022

This article presents a methodology to optimize the maintenance planning model and minimize the t... more This article presents a methodology to optimize the maintenance planning model and minimize the total maintenance costs of a typical school building. It makes an effort to provide a maintenance schedule, focusing on maintenance costs. In the allocation of operations to the school equipment, the parameter of its age was also taken into account. A mathematical optimization model to minimize the school maintenance cost in a three-year period was provided in the GAMS software with CPLEX solver. Finally, the optimum architecture of the Perceptron multi-layer neural network was used to predict the schedule of equipment operations and maintenance costs. The Multi-layer Perceptron (MLP) optimum neural network results, with minor Mean Squared Error (MSE) and Root Mean Squared Error (RMSE), indicated that the proposed model was capable of predicting the schools' maintenance costs with high accuracy. According to the results, the school's maintenance cost for the intended three-year period based on the Weibull distribution was equal to 15361 currency units per hour, in which the "heating and cooling system" has the highest contribution. Hence, accurate and definite planning can prevent damages to such equipment, while saving the school's maintenance costs.

American Journal of Civil Engineering and Architecture, Nov 26, 2013

Steel cylindrical reservoirs had the highest utilization in the field of oil source storage and p... more Steel cylindrical reservoirs had the highest utilization in the field of oil source storage and petrochemical in the recent years due to their significant importance. These types of reservoirs are conventionally made with steady and floating roofs. Long term erosion agents have destructive impacts on dynamic features of these reservoirs. Results of numerical researches demonstrate that the internal corrosion of reservoir walls as a constant dependent to time, which is made due to the connection of fluids and chemical interactions with the internal wall of reservoir causes the corrosion of inside the reservoir wall and reduction in wall stiffness. In this research dynamic behavior of three models of steel cylindrical reservoirs (with the same height to diameter proportion) containing fluid is modeled using ANSYS software by applying the finite element method. In this modeling, features of a cylindrical reservoir containing 0.9 height of liquid is used which its fluid is considered to be incompressible and viscose. First Modal and Harmonic analyses are used to evaluate the natural frequency and formed mode-shapes in the tank-fluid system. These models are compared and verified with the similar and current experimental formulas. Next by applying corrosion on one of the tanks, dynamic features are evaluated using the software. Then some mass is applied in the place of corrosion to the walls of reservoir with proper boundary conditions in several steps, which in each step, the changes in the added mass are considered using the transient analysis and finally the natural frequency is evaluated. This cycle continued until the frequency of reservoir having added mass has equaled to the frequency of corrosion reservoir which this method is called equivalent mass. In the end, the added mass to the reservoir is formulated using mathematical techniques. Based on the analytical results we found that corrosion or long term erosion have remarkable influences on natural frequency, mode-shapes of structures and its vibration.

Hydrology Research, Aug 30, 2018

Hybrid models development by combining the data-driven method of artificial neural network (ANN) ... more Hybrid models development by combining the data-driven method of artificial neural network (ANN) and wavelet decomposition for disaggregation of rainfall time series is the purpose of this paper. In this study, for disaggregating the Tabriz and Sahand rain-gauges time series, according to nonlinear characteristics of observed time scales, a wavelet-artificial neural network (WANN) hybrid model was suggested. For this purpose, 17 years of daily data of four rain-gauges and monthly data of six rain-gauges from the mountainous basin of Urmia Lake were decomposed with wavelet transform and then using mutual information and correlation coefficient criteria, the sub-series were ranked and superior sub-series were used as input data of ANN model for disaggregating the monthly rainfall time series to the daily time series. Results obtained by the WANN disaggregation model were compared with the results of ANN and classic multiple linear regression (MLR) models. The efficiency of the WANN model compared with the ANN and MLR models at validation stage in the optimized case for Tabriz rain-gauge showed up to a 22 and 41.2% increase and in the optimized case for Sahand rain-gauge it showed up to a 21.1 and 40.8% increase, respectively.

Aqua, May 21, 2021

Water leakage control in water distribution networks (WDNs) is one of the main challenges of wate... more Water leakage control in water distribution networks (WDNs) is one of the main challenges of water utilities. The present study proposes a new method to locate a leakage in WDNs using feedforward artificial neural networks (ANNs). For this purpose, two ANNs training cases are considered. For case 1, the ANNs are trained by average daily water demand, including small to large hypothetical leakages. In case 2, the ANNs are trained by hourly water demand and variable hourly nodal leakages over 24 hours. The training parameters are determined by EPANET2.0 hydraulic simulation software using MATLAB programming language. In both cases, first, ANNs are trained using flow rates of total pipes number. Then, sensitivity analysis is performed by hybrid ANNs for the flow rates of pipes number less than the number of the total pipes. The results of proposed hybrid ANNs indicate that if at least the flow rates of 10% of the total pipes are known (using flowmeters), then the leakage locations in both cases can be determined. Despite the complexity of case 2, because of the variations of demand and leakage over the 24-hour period, the proposed method could detect the leakage location with high accuracy. Key words | feedforward artificial neural network, hourly water demand, leakage, variable hourly nodal leakage, water distribution networks HIGHLIGHTS • A leakage detection algorithm for WDNs using feedforward ANNs. • ANNs were applied for two cases: average daily water demand and hypothetical leakages; variable water demand and nodal leakages over the 24-hour. • ANNs training based on pipe flow rates and nodal leakage. • A sensitivity analysis using Hybrid ANNs.

Earth Science Informatics, Oct 6, 2021

Satellite remote sensing is the main tool for estimating precipitation over areas with sparse rai... more Satellite remote sensing is the main tool for estimating precipitation over areas with sparse rain gauge networks. Accurate gridded precipitation data at high temporal and spatial scales are needed for various studies such as hydrology, climatology, and meteorology. Meanwhile, downscaling of satellite precipitation products is necessary to attain such data because their spatial resolutions are too coarse for use in local region and basin scales or for parameterizing meteorological and hydrological models at a local scale. In recent years, plenty of attempts have been made to improve the resolutions of satellite-based precipitation estimates, and many algorithms have been proposed for this purpose. A review study of existing methods can help improve and develop future precipitation downscaling algorithms. Therefore, in this paper, the existing downscaling methods are reviewed, categorized, and summarized. Also, the performance of these methods in the studied regions is compared, and their advantages and limitations are highlighted. Finally, we concluded by stating the necessary considerations for future studies.

Ain Shams Engineering Journal, Jun 1, 2021

Abstract In recent decades, climate change has caused an increase in anomalies in climatic variab... more Abstract In recent decades, climate change has caused an increase in anomalies in climatic variables and endangered critical infrastructures such as water resources. This change is of paramount importance for southern Iran, especially in the low-precipitation Sistan Plain. Therefore, it is crucial to consider variations in evaporation in the past and the trends of its future changes for water resources planning and management. To manage water resources in the region, this study was conducted to estimate variation in and rate of evaporation from the surface of Chahnimeh reservoirs for future decades using effective climate change models. The SDSM model was applied in 2050–2030 and 2080–2000 periods to simulate evaporation in the coming decades. The values of evaporation under climate change indicate an overall increase of more than 300 mm. According to the results of the WEAP model, much of the Chahnimeh reservoir’s water is consumed by the Zahedan and Zabol urban sectors. A lower share of water is allocated to the agricultural sector of the Sistan Plain compared to these two nodes. The withdrawal rates from these reservoirs will increase with increasing the population growth rate in the coming years. Furthermore, the evaporation rate will also increase. Hence, assuming a constant water flow discharge into the Chahnimeh reservoirs, severe water stress will occur in Sistan Plain and Zahedan water requirement.

Water Science & Technology: Water Supply, Mar 3, 2022

Illegal connection (IC) in water supply systems and water network wastes water as well as energy ... more Illegal connection (IC) in water supply systems and water network wastes water as well as energy and reduces water quality, which has negative technical and economic effects on water management. Transient-based defect detection is a powerful method applied in water pipelines. This paper investigates the efficiency of the transient-based inverse transient analysis (ITA) method in estimating the characteristics of ICs in the viscoelastic water supply system in the time domain. To better evaluate this method, an experimental transient model was developed using polyethylene pipelines (with a length of 158 meters and a nominal diameter of 2 inches). In the first step, the hydraulic transient solver was calibrated in the calibration approach of dynamic parameters of pressure wave speed and pipe wall viscoelasticity. Then, the sensitivity of the ITA method to the spatial step of the method of characteristics and signal sample size was assessed. Finally, the efficiency of the ITA method was evaluated for several experiments with different transient intensities and a noisy signal. The results indicated that the accuracy for locating the IC was higher than the accuracy for the IC's length.

Journal of Hydrologic Engineering

Advances in Civil Engineering, Feb 21, 2023

Te shear strength of fber-reinforced polymer (FRP) reinforced concrete beams is often given a lar... more Te shear strength of fber-reinforced polymer (FRP) reinforced concrete beams is often given a large safety margin by current construction requirements. Six characteristics are utilized as inputs to compute the shear strength of FRP-reinforced concrete beams. Tis study uses 198 samples from the literature to predict the shear strength of 139 training samples and 59 testing samples. Additionally, the ANN structure is optimized with the frefy algorithm. Te FA-ANN model is also compared to ACI-440, CSA-S806, and BISE-99 codes, and the optimized model by Nehdi et al. Findings show that regarding the shear strength of FRPreinforced concrete beams, the frefy algorithm-optimized model performs better than the other four models. Concerning accuracy, the coefcient of correlation, R 2 , was calculated as 0.961, while the average absolute error (AAE) is 0.22 for the shear strength of FRP-reinforced beams.

Social Science Research Network, 2023

Numerical Methods in Civil Engineering, 2020

Today, various structural and non-structural solutions are used to control and reduce the negativ... more Today, various structural and non-structural solutions are used to control and reduce the negative effects of floods in investigation and executive projects. But what is certain is that the optimal solution to minimize flood damage is a combination of structural and non-structural methods (planning and response measures). It is essential to provide these solutions in a metropolis like Tehran because the hydrographic network of Tehran runoff is sometimes incomplete during floods and is accompanied by severe flooding. Therefore, in this study, a combination of the mentioned methods were used for a part of Tehran's Mianroud canal (as one of the most important surface water management facilities in the catchment area of west Tehran) called Ariafar Boulevard Bridge. For this purpose, in the first step, severe accident hotspots along the route were investigated and then the capacity of passing on accident-prone routes was evaluated according to hydrological information under different scenarios (discharges with return periods of 5, 10, 25 and 100-years). The results show the adequacy of channel capacity for a 10-year return period. But for the 25, 50 and 100-year discharge, we will face 8.88%, 28.93% and 50.81% capacity shortages, respectively. In the second step, considering the structural solutions, the methods of eliminating the capacity shortage of bottlenecks, including correcting the route, installing auxiliary routes, or destroying bridges that prevented the transfer of runoff in the canal route were carefully examined. The results showed that the combined use of structural and non-structural methods increases the effectiveness and significantly reduces the risk of flood spreading in the city.

Journal of Fundamental and Applied Sciences, 2018

In order to design earthquake resistant dams and evaluate the safety of existing dams that will b... more In order to design earthquake resistant dams and evaluate the safety of existing dams that will be exposed to future earthquakes, it is essential to have accurate and reliable analysis procedures to predict the stresses and deformations in dams subjected to earthquake ground motion. For a damwater-foundation system, the earthquake response is significantly influenced by the interaction of the dam with the impounded water and with the underlying foundation region, thus increasing the requirements for the analysis procedure to be used, and complicating what would otherwise have been considered a routine finite element analysis of a concrete cross-section. In this paper Latyan concrete buttress dam subjected to different records including reservoir effects by finite element method using ABAQUS.