Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Mahmood Shafai-Bajestan"'
Publikováno v:
Ain Shams Engineering Journal, Vol 12, Iss 1, Pp 381-391 (2021)
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 bed, and A-Jack concrete block armors can be used as an effective way to control such a phe
Externí odkaz:
https://doaj.org/article/5d21cb8d994544d383f217dc02f744cb
Publikováno v:
Shock and Vibration, Vol 2021 (2021)
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 materials downstream of dams could affect the performance of dams or power plants by alter
Externí odkaz:
https://doaj.org/article/f51e616a7c5e4febba35042b5477332b
Publikováno v:
مجله آب و خاک, Vol 30, Iss 2, Pp 392-404 (2017)
Introduction: Flow patterns within the river bend is three dimensional. Occurrence of secondary flow due to centrifugal force and formation of helicoidally vortex in river bend usually causes the outer bank of river erodes whilst the sediment are dep
Externí odkaz:
https://doaj.org/article/13db663ad4614e90b9949b410a8e1a63
Publikováno v:
علوم و مهندسی آبیاری, Vol 45, Iss 4, Pp 15-30 (2023)
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 permeability is classified an permeable and impermeable. Spur dikes restore flow pattern and prev
Externí odkaz:
https://doaj.org/article/cb5debe5b2704d53bb01871af1036306
Autor:
Abdollah Sardasteh, Seyed Ali Ayyoubzadeh, Mahmood Shafai Bajestan, Jamal Mohammad Vali Samani
Publikováno v:
علوم و مهندسی آبیاری, Vol 45, Iss 3, Pp 63-77 (2022)
Due to scouring problems in impermeable spur dikes, which compromise structural strength and stability and as a result repair and maintenance costs increase, an alternative method of scouring is needed to protect the river bank. In this area, bandal-
Externí odkaz:
https://doaj.org/article/764551f064554007923591e4d18d231d
Publikováno v:
علوم و مهندسی آبیاری, Vol 42, Iss 2, Pp 215-230 (2019)
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 approaching flow pattern around it is disturbed. In addition, this brings about an increase in t
Externí odkaz:
https://doaj.org/article/794e3e3cff044fa69339a55473faa119
Publikováno v:
علوم و مهندسی آبیاری, Vol 42, Iss 1, Pp 99-114 (2019)
Destruction of bridges caused by scour and other natural phenomenon brings about financial and life losses. Hence, researchers have been studied extensively the scour mechanism and methods of scour countermeasure. Usually scour at bridge occurs both
Externí odkaz:
https://doaj.org/article/712cce7862ea4e88833dde8a5addd7dd
Publikováno v:
علوم و مهندسی آبیاری, Vol 40, Iss 4, Pp 109-124 (2018)
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 phenomenon that alters the flow regime of the state of supercritical to the subcritical with diss
Externí odkaz:
https://doaj.org/article/35fea7c44aeb4351b9119a8eff8cf7a7
Publikováno v:
علوم و مهندسی آبیاری, Vol 40, Iss 2, Pp 15-25 (2017)
Stilling basin is one of the dissipated energy structures in water transfer systems that its dimensions depend on the characteristics of hydraulic jump.In present study, six legs elements have been used in different permeability on basin bed and the
Externí odkaz:
https://doaj.org/article/02e3d50aa33044b8ab18c592a2fa260e
Publikováno v:
علوم و مهندسی آبیاری, Vol 40, Iss 2, Pp 1-14 (2017)
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 submerged conditions by conducting a set of experimental tests. Bandal-like is made by combining p
Externí odkaz:
https://doaj.org/article/18ca63a5ee1f475c983ccceb60090041