مهندسی عمران-سازه های هیدرولیکی
roozbeh aghamajidi; amir kamanbedast
Abstract
In this study, the effect of change of flow discharge on the scouring around the piers of the fifth bridge of Dezful was investigated using the Hsec-RAS numerical model. For this purpose, a hydraulic model was created from the range of the river in which the bridge is located in the software by using ...
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In this study, the effect of change of flow discharge on the scouring around the piers of the fifth bridge of Dezful was investigated using the Hsec-RAS numerical model. For this purpose, a hydraulic model was created from the range of the river in which the bridge is located in the software by using field data. Then, by entering the data on the scouring of the bridge bases for the discharge of 25 to 1850 m3/s with different time steps, the effect of change of flow discharge on the scour around the middle and lateral piers of the bridge was investigated. The results of numerical model show a trend The increase was such that in low to moderate discharges (329m3/s) the scouring rate around the middle piers had the highest value, but in high discharges and flood conditions the scurry in the right support had the highest value, also up to 1630 m3/s flood conditions, the scouring rate in the left support had the lowest value, which was due to the morphology of the river bed and the Conditions are the creation of secondary currents in the arc.
مهندسی عمران-سازه های هیدرولیکی
roozbeh Aghamajidi; Alireza EttehadNia
Abstract
The purpose of this research is to predict the environmental effects of the water transmission line project on the environment. The research method is descriptive and analytical using existing resources. Investigations showed that in the design of the water transmission line, the implementation of environmental ...
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The purpose of this research is to predict the environmental effects of the water transmission line project on the environment. The research method is descriptive and analytical using existing resources. Investigations showed that in the design of the water transmission line, the implementation of environmental considerations can play an effective role in controlling and reducing the harmful effects of the environment. Therefore, it is necessary to strictly implement measures and solutions to reduce environmental effects in water transfer areas. This is suggested by carrying out preferential environmental impact assessment studies for the superior option from the technical, economic, social and environmental point of view. On the other hand, one of the success factors in the sustainability of development plans is the degree of acceptance of these plans by the people and local communities and their participation in the implementation and exploitation of the plan. Since the project of transferring water from the Persian Gulf is carried out with the main goal of supplying water to industries in the southeast of the country, it seems that in the short term it is not possible to supply drinking water to the residential areas within the scope of the project. However, if local labor force is used in the implementation and exploitation phase and the project is welcomed by the human communities related to the project, this project can have positive effects on the social, economic and cultural environment of the project.
roozbeh aghamajidi
Abstract
The pumping station is a collection of pumps, driving forces and auxiliary equipment e.g., collector system, power supply system, and control and protection systems. Small pumping stations are usually designed in the simplest possible way for the ease of operation of auxiliary equipment. However, as ...
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The pumping station is a collection of pumps, driving forces and auxiliary equipment e.g., collector system, power supply system, and control and protection systems. Small pumping stations are usually designed in the simplest possible way for the ease of operation of auxiliary equipment. However, as the capacity of the pumping station increases, the technical complexity and design of peripheral equipment increases, which requires its own design according to the conditions, type of work, and location of the project. The choice of the type of station building, the type and capacity of the main and reserve pumps, in accordance with the special conditions of each project are contingent upon the nature of the plan. This study evaluates the basics of designing pumping stations, taking into account the above-mentioned issues, focusing on the system of pumping and transferring water from Dasht Zozen to the central site of the water supply facilities of Sangan Industries.Keywords: Pumping station, water transfer system, pump capacity
roozbeh aghamajidi
Abstract
r, it is vital for preserving water resource in each area. In the meantime, Iran has been in a state of inaccurate crisis due to the excessive withdrawal of water resources. Therefore, it is important to maintain water resources. And, the traditional methods of water transfer (using open channels and ...
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r, it is vital for preserving water resource in each area. In the meantime, Iran has been in a state of inaccurate crisis due to the excessive withdrawal of water resources. Therefore, it is important to maintain water resources. And, the traditional methods of water transfer (using open channels and ...) are replaced by new methods such as the use of a water supply pipe. These methods, in addition to cost, have many technical benefits. Including increased transmission efficiency, reduced water waste, as well as saving passive defense principles.Meanwhile, the use of GRP pipes, in the last 40 years, has led to a dramatic increase. Although the life period of these pipes in the our country will reach 53 years, the efficiency of these engineering pipes has become more and more enriched, reaching its true position in the country.Due to the great efforts of the responsible and informed management of some manufacturers of these products in the country, the optimal use of this type of pipes is increasing. In this regard, Farassan Co., as the flagship of this industry, has made endless efforts to update and improve the quality of pipes, and has made significant progress. One of the most important points in the use of GRP pipes in comparison with other pipes is the lack of knowledge and awareness of some customers about these pipes and products, which is always a concern for employers and consultants. In this paper, in addition to the proper introduction of GRP Pipes and their use in comparison with other PIPES, it has been tried to discuss the control and monitoring the of the Water hammer in these types of products. In this regard, in the case of a water pipe line project from Azadi dam to the plain of Hor as one of the most important projects of water transportation in Iran, is briefly introduced and analyzed according to the details. Finally, a briefly studying about control and effect of the hammer phenomenon on the GRP pipes in special project is perfectly discussed.
roozbeh aghamajidi; amir abbas kamanbedast
Abstract
The discussion of earthworks and irrigation and drainage projects is very important from a technical and economic point of view. In the Southwest Khuzestan pipeline project with 230 kilometers of G.R.P. pipes, it is effective to provide the volume of earth materials for earthling around the pipe and ...
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The discussion of earthworks and irrigation and drainage projects is very important from a technical and economic point of view. In the Southwest Khuzestan pipeline project with 230 kilometers of G.R.P. pipes, it is effective to provide the volume of earth materials for earthling around the pipe and also earthling to ensure the depth of the trench before trenching. Due to the presence of sand materials in the region, in this research, these materials were used in earthworks around the pipe in different ways, including compaction by compactor and also compaction by flooding method, and the results showed that it is possible to use sand materials with fine grains less than He compacted 12% in the form of flooding and up to a density of 85%. Also, in order to provide the depth of the trench, you can mix sand materials with different percentages of clay so that the percentage of different salts such as gypsum, sulfate, and chlorine is reduced and the specific weight of the clay is increased. Different methods of moistening soil materials were compared in order to provide optimal moisture, including moistening at the borrow site and on the road. The effect of humidity on the density of soils with different grain sizes was also compared. The results showed that in clay materials, if the moisture content is more than 3% less than the optimum moisture content, it is difficult to compensate it by tamping. In the earthen layers made with fine-grained materials, traffic has a more negative effect on the density of the layer. The coarser the materials, the less impact traffic and passage of time will have. Also, the study of cross-sections showed that in sandy fields, the best way to protect the roads from the influx of quicksand is to follow the natural slope of the land as much as possible and to avoid earthmoving or earthmoving at a high height as much as possible.
roozbeh aghamajidi
Abstract
In recent decades, many dams have been built. Due to the high need for water and the increasing soil erosion in different areas, the need to build a dam is quite obvious. In 1900, the number of large dams did not exceed 50. However, between 1950 and 1986, the number of large dams (more than 15 meters ...
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In recent decades, many dams have been built. Due to the high need for water and the increasing soil erosion in different areas, the need to build a dam is quite obvious. In 1900, the number of large dams did not exceed 50. However, between 1950 and 1986, the number of large dams (more than 15 meters high) was more than 39,000. Since the 70s, the construction of dams has been developing more and more. This expansion has been more visible in the Asian, Central and South American regions. According to the construction purpose, each dam structure must be able to pass the volume of excess water caused by the flood, and for this purpose, various structures such as spillways are used. The spillways are different according to the type of exploitation and the type of project. In other words, there are different types of leaks. Which are one of these types of shaft spillway. The spillway of a morning glory consists of a circular crest that directs the flow to an inclined or vertical axis. The mentioned axis is connected to a conduct way with a low gradient. In this research, in order to investigate the performance of both vortex breakers on the hydraulic spillway of morning glory, several tests have been conducted with various types of vortex breakers. The results show that the best vorticity channel with a low height and length is an arrangement of 6, which increases the flow rate by 23%. It should be noted that increasing the thickness of the vortex breaker by more than 7% of the spillway radius does not have much effect on the increase of the spillway coefficient.
