نتایج جستجو برای: scour

تعداد نتایج: 1518  

Journal: :Journal of Civil Structural Health Monitoring 2022

Abstract Scour is the prevailing cause of bridge failure worldwide, leading not only to traffic disruption, but also social and economic losses even casualties. Many vibration-based monitoring techniques have been proposed for identifying scour location extent, based on evaluation changes modal properties due scour. This study describes experimental numerical research carried out investigate ef...

Journal: :Egyptian Journal for Engineering Sciences and Technology 2005

Journal: :JAPANESE JOURNAL OF MULTIPHASE FLOW 2019

An experimental approach was carried out to study the time development and extension of scouring around a circular pier protected by a collar. The experiments included the study of scouring around an unprotected pier as well as the pier protected with collars located at different levels. Width of collars was 3 times the pier diameter. It was found that with collars, though the scour depth and t...

Journal: :Journal of Geotechnical and Geoenvironmental Engineering 2023

Physical models have suggested a large reduction in bearing capacity of simple foundations due to overtopping tsunami scour. We use the results these tests create scoured foundation geometries for breakwater-type structures and investigate change system’s scour through two-dimensional (2D) numerical analysis using an advanced constitutive model. The particular aspects construction such general ...

The Performance of shooting pool, in addition to the quality of the area in which the flow collides with it, depends to the height of the jet drop, the angle of the water flow, the depth of the jet and the concentration of the jet. By increasing the height of the jet drop, the fall velocity increases and subsequently the jetchr('39')s energy will be more intrusive. Different collision area from...

ژورنال: علوم آب و خاک 2022

In this research, the scour hole depth at the downstream of cross-vane structures with different shapes (i.e., J, I, U, and W) was simulated utilizing a modern artificial intelligence method entitled "Outlier Robust Extreme Learning Machine (ORELM)". The observational data were divided into two groups: training (70%) and test (30%). Then, using the input parameters including the ratio of the st...

Journal: :پژوهش های حفاظت آب و خاک 0

spur dike is an important element for protection of river banks. spur dike causes variations in flow field, sediment transport and bed topography. the mechanism of flow and sediment transport in a channel bend is very complex, especially when a spur dike is constructed in a bend. in this paper the time variations of dimension of the scour hole and the bed’s topography were considered around a t...

Journal: :تحقیقات مهندسی کشاورزی 0
رضا عزیزی استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان محمود شفاعی بجستان استاد گروه سازه های آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز مهدی قمشی استاد گروه سازه های آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

the shape of a submerged vane is a major factor in the design of a vane system and affects the performance and secondary currents generated by the vanes. this study investigated the effect of five vane shapes on bed sediment processes (local scour at the leading edge and transverse distribution of sediment downstream of the vanes) at four flow intensities for a total of 20 experiments. the resu...

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