IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : Influence of the River Bed Stratification on Scour at Foundations
Influence of the River Bed Stratification on Scour at Foundations
Author : Boriss Gjunsburgs, Elena Govsha and Gints Jaudzems
River bed stratification influence on the scour depth value near bridge foundations, considerably increasing or reducing it - depending on sequence, thickness of layers with different grain sizes and can be reason of the bridge failure. The aim of this study is to elucidate the influence of the bed stratification on the scour depth at elliptical guide banks for clear water conditions on the plain rivers. New methods for computing the depth of scour development in time and equilibrium stage of scour at elliptical guide banks under layered bed are presented. The influence of the river bed stratification on the s cour depth near elliptical guide banks is confirmed by presented results. The depth of scour, for example, is always greater when a fine-sand layer is under a coarse-sand layer(s), compare with the depth of scour obtained with mean grain size diameter of coarse-sand layer, which is on the top. The calculation of the scour depth near bridge foundations by using only the grain size diameter which is on the top of the river bed and neglecting the layering, as it accepted now, can lead to wrong results and finally to considerable damages and losses.
File Size : 502,925 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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