Seyed Ali Ayyoubzadeh

Seyed Ali Ayyoubzadeh
Tarbiat Modares University | TMU · Department of Water Structures Engineering

Professor

About

69
Publications
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511
Citations

Publications

Publications (69)
Article
مدل‌های ریاضی فردگرای مبتنی بر تئوری بیوانرژی به عنوان آخرین تلاش‌های انجام شده در زمینه مدل‌سازی زیستگاه‌های رودخانه‌ای در علم اکوهیدرولیک مطرح می‌باشند. فرض اصلی این نوع مدل‌ها بر این است که خصوصیات جمعیت ماهی از رشد، بقا و تولیدمثل افراد ناشی می‌شود و فرآیندهای مبتنی بر خصوصیات فردی نیز تحت تأثیر شرایط اکوهیدرولیکی زیستگاه و میزان انرژی دریافتی...
Article
The presence of vegetation on the floodplains of compound channels affects the structure of mean flow, increases flow resistance and turbulence intensity, and impacts sediment transport. In prismatic compound channels, the shear stress at the interface between the flows in the main channel and lateral floodplains has a strong influence in the cross...
Article
This experimental study investigated the physical model of a 180-degree river bend to introduce a new measure called as winged bandal-like (WBL) structure for river bed sediment management. The new structure is a combination of bandal-like (BL) and triangular vane structures. Nine different alternatives of the WBL structure, including three dimensi...
Article
Full-text available
In this study, network simulation method is applied to solve a 1-D solute transfer problem governed by transient storage model in a mountain stream including dead zones. In this computational method, for each node of the discretized domain, the terms of governing equation are substituted by the equivalent electrical devices which are connected to e...
Article
Full-text available
Introduction: Human activities everyday release a huge amount of domestic, industrial, and agricultural waste into water bodies and continuously change the ecosystem conditions in the world. Considering the harmful effects of these pollutants entering water resources, study about pollution transfer in streams and predicting the pollutant concentrat...
Conference Paper
Full-text available
Regarding the harmful and irrecoverable environmental effects of pollutions releasing from different sources into water bodies, studies on predicting and controlling these pollutions seem necessary. The well-known Advection-Dispersion Equation (ADE) which causes a parabolic distribution, has been used frequently in solving transport problems includ...
Article
Biomass is an important parameter in studying a variety of energetic processes in food webs, community structure, and composition of aquatic organisms. Biomass determinations are based on direct weighing of animals, biovolume determination, and length-weight conversion. Although direct weighing of individual organisms is the most accurate methodolo...
Article
Full-text available
Burrowing-type suction pipe method is a siphon dredging technique which removes sediment. This innovative technique attracted the attention of many researchers, recently, because of main advantages such as preventing water loss and conserving downstream environmental sustainability of dams. This study investigates the influence of geometrical and m...
Article
Full-text available
Description of velocity and depth attributes of stream channel is a basic goal of theoretical and applied hydrology, and is also critical for modeling the distribution of biological processes ranging from algal production to fish distribution. In the present research one dimensional hydraulic habitat model (PHABSIM) is used to simulate physical hab...
Article
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Environmental Flow Requirement (EFR) is defined as the flow that is necessary to ensure the existence of habitats in water resources systems. EFR is defined in rivers as flow index commonly. Tennant method is the most popular hydrological method in rivers and based on the historic flow data. The most common method of hydraulic rating method is the...
Presentation
Full-text available
Floods, with huge amount of water and sediment, play an important role in deposition and distribution of sediment in reservoirs. In this paper, the flow pattern and characteristics of delta in a reservoir are experimentally studied using steady and unsteady flows of water and sediment. The experiments were carried out using triangular and trapezoid...
Conference Paper
Full-text available
Industrial development, water crisis and consequently environmental risks created in the rivers in recent decades has caused big problems for these types of water bodies in different countries of the world and evaluating the interactions between ecological and hydraulic conditions of the river in order to investigate the health condition of rivers...
Article
Full-text available
The coarser particles deposit gradually and form a Delta at the upstream of the reservoir that extends further downstream towards the dam. In this research, the effect of non-uniform sediment particles has been studied on the Delta progression in the reservoir in a physical model. Ten types of grading curves were used. All of the curves were the sa...
Article
Full-text available
Instream flow needs (IFN) assessment studies are performed to provide guidelines for stream water management and to assess the impacts of different water projects such as weirs, dams and stream diversions on the available fish habitat. The physical habitat simulation is one of the IFN assessment methods and also a powerful tool in management of riv...
Conference Paper
Increase in water demand has caused that researches related to instream flow needs (IFN) assessment developed rapidly in recent years. Using the physical habitat assessment as a powerful tool in management of river ecosystem has not become a common method in many countries, yet. The main aim of the present research is representing the ability of ha...
Article
Utilisation of submerged vanes in front of intake ports is an effective approach to address sedimentation in lateral intakes from rivers. Strategically installed, these flow-training structures could increase the mid-depth and near surface flows into the intake, and simultaneously prevent bed-load transport from entering the intake channels. The ef...
Article
Full-text available
In the present research environmental condition of a mountainous stream in macro habitat scale is investigated, and Delichai mountainous stream is selected as the pattern stream for investigation. At first hydrological and hydraulic approaches in the study stream were investigated. In the next step, physical habitat in macro scale was evaluated. Ba...
Article
Full-text available
River physical habitat is defined as the variation of hydraulic parameters such as depth, velocity and bed cover in habitat condition of aquatic organisms. According to the previous studies physical habitat has considerable effect on habitat condition of different fish species. This study is carried out on a mountainous stream in Iran. In this rese...
Article
Full-text available
This paper describes the application of the Smoothed Particle Hydrodynamics (SPH) method for modeling two dimensional waves caused by dam break over a movable bed in two dimensions. The two phase SPH method is developed to solve the Navier-Stokes equations. Both fluid and sediment phases are described by particles as weakly compressible fluids and...
Article
Full-text available
One of the most important problems that the river engineers have long been faced with lateral intake from rivers is sedimentation in intakes. Formation of the saddle point nearby the intake entrance is one of the main reasons for entry of the sediments into the intake channel. Using the structures in the rivers causes change of the flow pattern and...
Article
Submerged vanes are river-training structures installed vertically in front of intake ports to exclude sediment at water intakes. The performance of submerged vanes depends on their dimensions, configuration and shape. This study was aimed at numerically investigating the effect of vane configuration on sedimentation in a 90° intake from a straight...
Article
Groynes have been widely used to redirect the flow in channels and to protect eroding river banks. In general, groynes are more beneficial to aquatic habitat resources than other types of bank protection structures. One of the most important problems for designers is the estimation of maximum local scour depth in the vicinity of groynes. Due to con...
Article
Suspended Sediment Concentration (SSC) in surface waters affects directly on the water quality, phytoplankton's fertility, pollution distribution and redistribution. In this study, temporal and spatial variations of SSC at Bahmnshir Estuary (BE) in the southwest of Iran were investigated using five field campaigns and Moderate Resolution Imaging Sp...
Conference Paper
Full-text available
In compound channels flow, because more roughness on the floodplain there are astrong interaction between the main channel and floodplain in the region connection , that affectson the hydraulics condition in this sections. Inthis study,with using the results ofa comparatively long laboratory compound channel, the effectsof floodplain roughnesson th...
Article
Three-dimensional flows in sudden expansions of rectangular channels have been investigated. In this research, CFD simulation model (FLUENT6.2) is used. The k-ε turbulence model is used to simulate turbulence. Desired canal with coarse, medium and fine mesh size is selected for simulation. The results in canal with sudden expansion showed that the...
Article
Full-text available
Flow in compound channels with overbank flows becomes more complex because of shear interactions between flows in main channel and flood plains, lateral momentum transfer and secondary flows. Compound channels have interesting applications in flood control, civil engineering and environmental management. Because it is difficult to obtain sufficient...
Conference Paper
The present study has been conducted to investigate the effect of inlet flow regimes on vertical velocity and concentration profiles of the turbidity current. Experiments carried out on small scale channel and Kaolin with a density of 2.65 kg/m³ and a mean particle diameter of 4.5 μm, was used to generate the currents. Velocities were obtained at a...
Article
Full-text available
Cross section geometry of stable alluvial channels usually is estimated by simple inaccurate empirical equations, because of the complexity of the phenomena and unknown physical processes of regime channels. So, the main purpose of this study is to evaluate the potential of simulating regime channel treatments using artificial neural networks (ANNs...
Article
Full-text available
Sediment load estimation is essential in many water resources projects. In this study, the capability of two different types of model including SWAT as a process-based model and ANNs as a data-driven model in simulating sediment load were evaluated. The issue of uncertainty in the simulated outputs of the two models which stems from different sourc...
Chapter
In this chapter the authors have investigated the method and available equations for prediction of longitudinal dispersion coefficient in natural rivers and collected a data set to evaluate the performance of these equations. Based on the results, none of these empirical equations have good results and show considerable errors in comparison with me...
Article
Full-text available
The purpose of this paper is to present a 2D depth-averaged model for simulating and examining unsteady flow patterns in open channel bends. In particular, this paper proposes a 2D depth-averaged model that takes into account the influence of the secondary flow phenomenon through calculation of the dispersion stresses. The dispersion terms which ar...
Article
Longitudinal dispersion coefficient in rivers and natural streams usually is estimated by simple inaccurate empirical relations, because of the complexity of the phenomena. So, in this study using adaptive neuro-fuzzy inference system (ANFIS), which have the ability of perception and realization of phenomenon without need for mathematical governing...
Article
In this study, the common critical depth calculation in compound channels has been modified considering the effect of momentum transfer between the interface of a main channel and its floodplains. In noncorrected specific energy curves of a given slope, the flow is not necessarily entirely sub- or supercritical as it is in a single cross section an...
Article
Full-text available
Longitudinal dispersion coefficient in rivers and natural streams is usually estimated by simple inaccurate empirical relations because of the complexity of the phenomenon. In this study, the adaptive neuro-fuzzy inference system (ANFIS) is used to develop a new flexible tool for predicting the longitudinal dispersion coefficient. The system has th...
Article
Design flood is an indispensable criterion in many water projects. Unfortunately, many of developing countries including Iran are faced with lack of sufficient recorded hydrologic data. Thus, in order to cope with data scarcity and study ungauged catchments, application of developed empirical models based on other gauged catchments is a common stra...
Conference Paper
In this research the eight available empirical methods to predict longitudinal dispersion coefficient are analyzed and effect of river shape and hydraulic parameters in predicting dispersion characteristics are studied. The amount of longitudinal dispersion coefficient was computed using hydraulic and geometric parameters of 95 river data in USA ga...
Conference Paper
In this research, the transport of pollutant substances is studied by combining floodplain flow hydraulics in compound open channels and a numerical solution for advection-dispersion equation. The hydraulic parameters such as transverse varying of depth mean velocity, discharge and mean shear velocity in a typical and hypothetical river are determi...
Article
Design flood is an indispensable criterion in many water projects. Unfortunately, many of developing countries including Iran are faced with lack of sufficient recorded hydrologic data. Thus, in order to cope with data scarcity and study ungauged catchments, application of developed empirical models based on other gauged catchments is a common stra...

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Projects (3)
Project
The main purpose of this project is to modify inSTREAM to include more about how fish feed and how it depends on spatial variation in biomass of benthic invertebrates.