Evaluate The Performance Of The Control And Reduction Of Scour Protection Of Bridge Piers Cylindrical Candles
Seyed Amir Hossein
Mahmoudi
graduate student Department of Water Engineering University of Technology, Isfahan
author
Manuchehr
Heydarpur
Professor, Department of Water Engineering University of Technology, Isfahan
author
text
article
2016
per
Scouring is one of the most important issues in river engineering. A large number of bridges are destroyed worldwide every year, largely due to construction. But because they do not consider the role of hydraulic design in their design. Determining the depth of scouring is important because it indicates the potential for destruction of the flow around the structure. Therefore, it is necessary to predict the scouring pattern for safety in structures that are exposed to water. One of the methods for controlling and reducing scouring can be the use of roughness, collar, submersible plates and protective piles. In the present study, the effect of protective piles on controlling and reducing scour around the cylindrical supports has been investigated. In this study, protective candles with triangular arrangement and constant number of 5 candles were used. In this study, with the constant consideration of most of the parameters in the arrangement of the desired piles, only by changing the two main parameters of the angle of the vertex and the horizontal distance of the piles are distinguished from one another. The facials tested were tested and compared on a base of 3 centimeters at two angles of the vertices of 30 and 45 degrees and the horizontal distance of the piles of 0.7, 1, 1.3 times the diameter of the base. The results of the experiments showed that the efficiency of the pile is increased by decreasing the vertex angle or reducing the horizontal distance of the piles.465
Journal of Engineering & Construction Management
Assist. Prof. Dr. Roohollah Taherkhani
۲۵۳۸-۱۹۰۳
1
v.
3
no.
2016
7
11
https://www.jecm.ir/article_48034_3b82ee4b4e16772731a819e0181014f9.pdf
The Effect Of Flow On Stepped Spillway Walls Of The Arch Parameters
Seyede Mahdis
Kanaanie
Hydraulic engineering graduate student, University of Agricultural Sciences and Natural Resources
Sari
author
Ramin
Fazloula
Assistant Professor, Faculty Of Engineering, University of Agricultural Sciences and Natural
Resources Sari
author
Alireza
Emadi
Associate Professor, Faculty Of Engineering, University of Agricultural Sciences and Natural
Resources Sari
author
Janali
Taghavi
Lecturer, Faculty Of Engineering, University of Agricultural Sciences and Natural Resources Sari
author
text
article
2016
per
The flow ductility at the threshold of entry into the overflow is affected by the geometric shape of the conduction wall, which, if designed properly, can reduce the discharge coefficient significantly. For this purpose, in the present study, a physical model of a stack overflow and three arched conductor walls were used with different angles to flow paths. The results obtained in this study showed that by increasing the upstream head for all three conduction walls, the width of the contraction section is reduced. Also, in a steady upward head, the average width of the shrinkage cross section in the guiding wall with the 60 degree angle was the highest. By increasing the head upstream, the coefficient of discharge decreased, while the variation of the discharge coefficient in relation to the flow rate for all three arc-conductor walls was a downward trend. Finally, it was found that in a constant head, the amount of flow through the overflow in each of the three conductive walls did not differ significantly.
Journal of Engineering & Construction Management
Assist. Prof. Dr. Roohollah Taherkhani
۲۵۳۸-۱۹۰۳
1
v.
3
no.
2016
12
15
https://www.jecm.ir/article_48035_cdf207a0b7f62fa88cd7d6d4160b1e70.pdf
The Effect Of Detention Dams On The River Urban Flood Control Case Study (Vardavard River Catchment)
Behrang
Nurkarami
Water and Hydraulic Engineering master›s educated, Department of Civil Engineering,
Safadasht Unit, Islamic Azad University, Tehran, Iran
author
Mohammad aamel
Sadeghi
Assistant Professor and Faculty Member of Islamic Azad University, Vineyard
author
Hessam
Vatan dust
Assistant Professor and Faculty Member of Islamic Azad University Robat Karim
author
text
article
2016
per
In order to investigate the effect of delayed reservoirs on reducing the flood of the basin studied in this study (basin to Tehran), first, after designing and managing the flood, the effect of the flood is considered downstream without considering the reservoirs, then using The HEC-HMS software for the basin and reservoirs considered at the high basin of the urban basin, the model and performance of these reservoirs are considered in reducing the inflow hydrograph. The results showed that using Delayed Dams in Dubai, the output from the Watershed basin is greatly reduced. The effect of the reduction of peak flood discharge due to the construction of delayed dams in the Watershed basin for flood with return periods of 2, 5, 10, 25, 50, 100 years old is 91.4, 58.1, 89.9, 92.141.7 and 28.5%, respectively. Also, with the increase of the flood return period, the effect of these reservoirs decreases in reducing the flood discharge of the basin.
Journal of Engineering & Construction Management
Assist. Prof. Dr. Roohollah Taherkhani
۲۵۳۸-۱۹۰۳
1
v.
3
no.
2016
16
19
https://www.jecm.ir/article_48036_3689a011162a7a4255e7f23eed62c635.pdf
The Effect On The Leakage Flow Along The Horizontal Drainage, Power, Drifted And Hydraulic Gradient In Homogeneous Earth Dam By Numerical Simulation
Ali
Mahmud
Hydraulic Structures Engineering Islamic Azad University of Kerman
author
Mohammad
Badakhshan
Hydraulic Structures Engineering University of Tabriz
author
Abuzar
Seifi
Hydraulic Structures Engineering University of Tabriz
author
text
article
2016
per
Due to the effective role of earth dams in providing water needs and the potential hazards for their downstream communities, the issues of the safety of dams are in the making and also during the exploitation period is of particular importance. In this study, the effect of horizontal drainage on the reduction of the effects of leakage from a cross section of a homogeneous earth dam has been studied and compared. In addition, the leakage from the body and the maximum output gradient at the dam was calculated using the Seep / W software based on finite element method. The results of this study showed that the increase in the length of the horizontal drain is proportional to the discharge leakage from the dam and the photo ratio is under pressure. Also, with an increase in the length of the horizontal drain, the hydraulic gradient is slightly increased, but its increase in the outlet is not affected by the gravity, and therefore it will not be dangerous.
Journal of Engineering & Construction Management
Assist. Prof. Dr. Roohollah Taherkhani
۲۵۳۸-۱۹۰۳
1
v.
3
no.
2016
20
23
https://www.jecm.ir/article_48037_4018c49a95247193ec93b86c366ae58b.pdf
Repair, Simulation And Innovation Water Innovative Structures: A Guide For Posterity The Heritage Of Iran
Mahdi
Yasi
Department of Irrigation and Reclamation Engineering, College of Agriculture and Natural
Resources, Tehran University
author
text
article
2016
per
The history of Iranian civilization is known in the world. The existence of water structures in Iran, such as dams, gangways, ashtrawls, plumbers, water mills, and mills, has been centuries old, and reflects the deepening of Iranians and their vast knowledge of water engineering at that time. Some of these works are still under exploitation; some are rebuilt and work well; some are repaired and protected, but their use has been assigned to new and similar structures. The main purpose of this paper is to introduce examples of water structures in the permanent index of Iran, the need to preserve and restructure some of the existing structures, and modernize the structures for the survival of Iran's historical heritage. Also, innovation in the design and construction of new water structures as the historical and cultural heritage of the present age for the future of this land should be considered. It is recommended to construct and display physical models of sustainable or exotic water structures in squares and parks of Iranian cities.
Journal of Engineering & Construction Management
Assist. Prof. Dr. Roohollah Taherkhani
۲۵۳۸-۱۹۰۳
1
v.
3
no.
2016
24
27
https://www.jecm.ir/article_48038_20bf44156e69f7d3a792217e4c693c5e.pdf
A review of various types of filters in terms of resistance to evasion of materials in coastal structures and their comparison
Amir Arsalan
Karami Matin
maritime graduate student, Faculty of Civil and Environmental Engineering,
Tarbiat Modarres University
author
Mahdi
Shafiee Far
Professor, Department of Civil and Environmental Engineering, Tarbiat Modarres
University
author
text
article
2016
per
Filters are used in many marine and hydraulic structures to prevent evacuation and drainage. The filters are generally divided into three categories of closed geometry, stable open geometry, unsteady open geometry, in terms of resistance to escape of bed materials. In geometric filters, hydrodynamic loading does not occur, but volatile geometry filters allow materials to escape. In unstable open geometry filters, some volatile evaporation that prevents serious damage to the structure is acceptable. In order to operate open-source filters, extensive laboratory studies have been carried out to date, but there is still a brief knowledge available in this area. For this reason, the researchers in the field of hydraulic engineering do not use this design method in coastal structures. So, in coastal structures, filters are implemented and designed in the form of closed geometry. Due to the high importance of the filter layer in coastal structures, this paper examines the history of studies on the classification of different types of filters in terms of resistance to the escape of bed materials and their comparison.
Journal of Engineering & Construction Management
Assist. Prof. Dr. Roohollah Taherkhani
۲۵۳۸-۱۹۰۳
1
v.
3
no.
2016
28
33
https://www.jecm.ir/article_48039_fff6b47c4146fea53c9c9d126cf07db4.pdf