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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Extension of the scour hole upstream of bridge abutments
Extension of the scour hole upstream of bridge abutments
Author : SEPEHR KARIMI1, AMIR REZA ZARRATI2, S. AMIN SALAMATIAN3
ABSTRACT
Scouring is an important phenomenon caused by construction of various river structures in stream ways. Scouring
undermines the structures which this may cause serious damages. Therefore, studying scouring is an important part in
designing hydraulic and river structures. In the present work, scouring around bridge abutments is studied. A flume 12m
long and 0.75m wide was used for the experiments. Abutments with different lengths were installed in 7m distance from
the flume entrance. Bed scour topography at the vicinity of the abutments was measured at different flow shear stresses
in clear water condition by a laser meter. Using the measured data, some relationships were developed for calculating
scour hole side slopes at different directions around the abutments. Extension of the scour hole upstream of the
abutments and at the bridge section can be estimated by knowing the maximum scour depth and the scour hole slopes
calculated from these relationships. Maximum scour depth can be calculated from one of existing empirical equations.
An advantage of the present model is that if a pier is built in the vicinity of the abutment, bed scour at the pier due to the
extension of the abutment scour hole can be calculated. The flow condition at which the scour holes of the two
abutments reach each other and the bridge section experiences a full degradation can also be predicted
File Size : 2,185,121 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 28/08/2015
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