Spur-dikes are efficient hydraulic structures that made for numerous purposes. They have one end on the stream bank and another extending into current. As a result of existing spur-dikes in course, local scour phenomena usually occur around them, leading to several predicaments which been great concern engineers. For present work, laboratory experiments were carried out measure depths located a...

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...

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 ...

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...

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...

the efficiency of a collar in reducing the scour depth around circular and rectangular piers is studied at different flow intensities (ratio of upstream shear stress to sediment critical shear stress). rectangular piers aligned with the flow as well as skewed at 5º, 10º, 20º were examined. previous studies had shown that with collar the equilibrium time of scouring increases considerably. to re...

Abstract Riverbed deformation caused by river-crossing bridge construction can be divided into compression scour and local scour. Compared with scour, fewer studies have been made on the piers. It is noteworthy that, lead to riverbed of whole cross section along a site, which obviously detrimental foundation safety. Based summary existing research findings, prediction model for piers constructe...