Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Mahmood Shafai Bajestan"'
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
Publikováno v:
علوم و مهندسی آبیاری, Vol 40, Iss 1, Pp 25-35 (2017)
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 piers and abutment makes completely clear the necessity of investigating in the case of scour p
Externí odkaz:
https://doaj.org/article/a1d3f5ebfcfe4b978bf141f3caca54c1
Publikováno v:
Journal of Hydraulic Structures, Vol 2, Iss 1, Pp 1-11 (2016)
River confluence is a common feature of most irrigation and drainage channels and river systems, where tributary conflicts the main channel. In these section, rapid changes in velocity and discharge, sediment distribution and flow turbulent result in
Externí odkaz:
https://doaj.org/article/d2082443687945d29352d0cf36c48157
Determination of Stream Tube Dimensions and the Strength of Secondary Circulation at Lateral Intakes
Publikováno v:
آب و فاضلاب, Vol 22, Iss 4, Pp 83-94 (2012)
In lateral intakes a portion of stream flow which enters the intake is divided from the upstream of the intake and is called stream tube. Past researchers have proved that the amount of flow and sediment discharge entering the intake as well as desig
Externí odkaz:
https://doaj.org/article/b6764ce2cd0a4dfb9ac74d81c953885c