Search Results - "BAJESTAN, Mahmood Shafai"

Performance evaluation of correction coefficients to optimize sediment rating curves on the basis of the Karkheh dam reservoir hydrography, west Iran by Hassanzadeh, Haideh, Shafai Bajestan, Mahmood, Rostami Paydar, Ghodratollah

“…The prediction of useful lifetime of a dam is estimated through accurate estimate of river sediments which mostly depend on sediment rating curve. Over the…”
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The effect of relative surface roughness on scour dimensions at the edge of horizontal apron by Koochak, Parisa, Bajestan, Mahmood Shafai

“…Roughened horizontal aprons are bed covering scour countermeasures constructed downstream of stilling basins and other places where scour hole may develop. In…”
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Effect of bank slope on the flow patterns in river intakes by SEYEDIAN, Seyed Morteza, BAJESTAN, Mahmood Shafai, FARASATI, Masoomeh

“…In this work, we studied the dimensions of stream tube in the vertical as well as inclined bank conditions. Data were collected from both a physical model and…”
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Experimental study of headcut erosion in cohesive soils under different consolidation types and hydraulic parameters by Babazadeh, Hossein, Ashourian, Masoumeh, Shafai-Bajestan, Mahmood

“…Headcut is a change in stream channel elevation, where there is concentrated flow. Most of the past studies focus on non-cohesive soils, although many problems…”
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Hydrodynamic Performance of A-Jacks Concrete Armor Units in Riverbeds around Downstream in Flip Buckets by Khalifehei, Kamran, Azizyan, Gholamreza, Shafai-Bajestan, Mahmood

“…The jet flipped from flip buckets hits the dam’s downstream side as a free jet with an immense amount of energy, leading to bed erosion. Erosion of river bed…”
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Uncertainty Analysis of Rainfall–Runoff Relationships Using Fuzzy Set Theory and Copula Functions by Sabaghi, Babak, Shafai Bajestan, Mahmood, Aminnejad, Babak

“…Generating a mathematical relationship between rainfall and runoff plays an important role in the decision-making process and control of surface flows. This…”
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Stability of A-Jack concrete block armors protecting the riverbeds by Kamran Khalifehei, Gholamreza Azizyan, Mahmood Shafai-Bajestan, Kwok-wing Chau

“…Flip buckets are among one of the most common types of energy dissipaters, especially for dams. The scouring phenomenon occurs when falling jets hit the river…”
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simplified model for reservoir operation considering the water quality issues: Application of the Young conflict resolution theory by Shirangi, Ehsan, Kerachian, Reza, Bajestan, Mahmood Shafai

“…In this study, an algorithm combining a multi-objective genetic algorithm (GA)-based optimization model and a water quality simulation model is developed for…”
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The Effect of Percentage Permeability in Composite Structure of Spur dike with Vane on a Sedimentation Pattern in 180̊ mild curve by sina Cheraghchi, Mahmood Shafai Bajestan

“…One common method for Blank River protection and restoration is use of Spur dikes. Spur dikes either in the forms of group or single, depending on their…”
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Experiment Study on Bed Topography around Wedged Bandal-like, Bandal-like and Impermeable Spur dike Structures at 180 Degree Bend in Non-Submerged Conditions by Abdollah Sardasteh, Seyed Ali Ayyoubzadeh, Mahmood Shafai Bajestan, Jamal Mohammad Vali Samani

“…Due to scouring problems in impermeable spur dikes, which compromise structural strength and stability and as a result repair and maintenance costs increase,…”
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Hydraulic Jump Stilling Basins Downstream Scour Covered with Six-Legs Elements under Reduction of Basin Length by leila torfei salehei, mahmood shafai bajestan

“…The most common way to dissipate the water kinetic energy at the downstream of weirs , gates at chutes is to use the hydraulic jump. Hydraulic jump is a…”
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The Effect of Installing Immerse Vanes on Scouring Around Bridge Abutments by Atefe Heydari, Mahmood Shafai Bajestan, Mohammad Bahrami Yarahmadi

“…To control scour, it is first necessary to examine the scouring mechanism and the flow patterns around the abutment. By constructing of the abutment, the…”
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Characteristics of Hydraulic Jump on The Bed with Permeable Six Legs Elements by Maryam Khajeh Goodari, mahmood shafai bajestan

“…Stilling basin is one of the dissipated energy structures in water transfer systems that its dimensions depend on the characteristics of hydraulic jump.In…”
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Investigation of The Area of Around Bridge Abutment by A-Jacks to Protect Against Scour by Sara Mohammad Pour, mahmood shafai bajestan

“…Scouring is a natural phenomenon that arises from the erosive action of flow field in the alluvial streams. Bridge failure caused by fully scouring of the…”
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Experimental Study of the Effect of W-weir on Reduction of Scour Depth at 90 Degree Sharp Bend by Vida Atashi, Mahmood Shafai-Bajestan, Ideh Golrokh

“…Introduction: Flow patterns within the river bend is three dimensional. Occurrence of secondary flow due to centrifugal force and formation of helicoidally…”
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The Effects of Permeable, Impermeable and Bandal-like Spur-dike Angel On Geometric Dimensions of Scouring In Submerged Conditions by Fatemeh Jarah Zade, Mahmood kashefipour, Mahmood Shafai Bajestan

“…The purpose of this study is to compare the scouring hole geometric dimensions for three kinds of spur-dike: permeable, impermeable and bandal-like for…”
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Investigation of the Effect of Six Legged Concrete (SLC) Elements Combined with Riprap on Scour Depth at Vertical Wall Bridge Abutments by Ali Akbar Hosein Reza, Mahmood Shafai bajestan, Mehdi Ghomeshi, Manoochehr Fathi Moghadam

“…Destruction of bridges caused by scour and other natural phenomenon brings about financial and life losses. Hence, researchers have been studied extensively…”
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Riprap sizing for scour protection at river confluence by Elham Ghanbari Adivi, Mahmood Shafai Bajestan, Jalil Kermannezhad

“…River confluence is a common feature of most irrigation and drainage channels and river systems, where tributary conflicts the main channel. In these section,…”
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Riprap Criteria below Pipe Outlet by Shafai-Bajestan, Mahmood, Albertson, Maurice L

“…In this study, a general relationship for incipient motion of the sediment below a jet is first developed. Then, for the particular case of a pipe outlet, an…”
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Sediment particles incipient motion criteria at closed box conduits by Hossein khozeymehnezhad, mahmood shafai bajestan

“…Deposition of sediment inside the conduit structures; eg inverted siphon; reduces the flow cross section area and increase the flow roughness which causes…”
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