RT - Journal Article
T1 - Effect of Upstream and Downstream Roughness on Scour Hole of Square Bridge Pile
JF - JSTNAR
YR - 2021
JO - JSTNAR
VO - 25
IS - 2
UR - http://jstnar.iut.ac.ir/article-1-4002-en.html
SP - 135
EP - 150
K1 - Scour hole
K1 - Squire bridge pile
K1 - Rectangular roughness
K1 - Triangular roughness
K1 - Non-liner regression
K1 - Analytical solution
AB - To prevent demolishing bridge piles due to developing the scour hole under the foundation of these piles some solution has been proposed in the literature. One of the important approaches could be installing different geometric of roughness at the downstream and upstream piles sections. This causes the downward flows which are performing the main role in developing scour holes to be marginally decreased. The present study explores the effect of geometric roughness and also, continuity and un-continuity of roughness length on maximum scour holes around bridge pile. Results indicate that due to increasing the length of roughness the developed scour holes were formed by less scour hole depths. Furthermore, continuity of roughness increases the scour hole depths; however, un-continuity causes the height of scour holes to be developed by fewer values. Also, the comparison shows that the length of installed roughness in maximum value is decreasing the scour hole depth constitute 34 percent. Based on the non-linear regression technique an equation has been proposed to predict the maximum scour hole due to different conditions. Comparison between experimental and proposed values shows that the accuracy of the proposed equation has an acceptable error which has been calculated less than 11 percent.
LA eng
UL http://jstnar.iut.ac.ir/article-1-4002-en.html
M3 10.47176/jwss.25.2.42481
ER -