Investigation of scour around two side-by-side piles with different spacing ratios in live-bed

Amir Bordbar*, Soroosh Sharifi, Hassan Hemida

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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In this study, a developed model is employed for numerically investigating scour around a group of two identical side-by-side piles. The model benefits from a coupled approach between a hydrodynamic and a morphodynamic model which is successfully validated for predicting scour around a single circular pile. The hydrodynamic model solves unsteady Reynolds-Averaged Navier-Stokes (RANS) equations in combination with the k-ω-SST turbulence closure model. The morphodynamic model entails bedload and suspended load sediment transport models for non-cohesive sand. The morphological evolution of the bed due to the sediment transport fluxes is expressed by a means of a mass-balance equation. The model is run for two side-by-side piles with three different spacing ratios G/D = 1, 2, and 3, where G represents the distance between the piles and D is the pile diameter, under steady-current flow and live-bed conditions. The results of the investigation reveal an inverse correlation between the spacing ratio and the scour hole depth adjacent to piles. The results are generalized and an equation is obtained for equilibrium scour hole depth as a function of the spacing ratio.

Original languageEnglish
Title of host publicationProceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering
Subtitle of host publicationSustainable Energy and Marine Planning
EditorsDat Vu Huynh, Anh Minh Tang, Dinh Hong Doan, Phil Watson
Number of pages8
ISBN (Electronic)9789811677359
ISBN (Print)9789811677342, 9789811677373
Publication statusPublished - 1 Jan 2022
Event2nd Vietnam Symposium on Advances in Offshore Engineering, VSOE 2021 - Ho Chi Minh City, Viet Nam
Duration: 1 Nov 20213 Nov 2021

Publication series

NameLecture Notes in Civil Engineering
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


Conference2nd Vietnam Symposium on Advances in Offshore Engineering, VSOE 2021
Country/TerritoryViet Nam
CityHo Chi Minh City

Bibliographical note

Publisher Copyright:
© 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.


  • CFD
  • Scour
  • Sediment transport
  • Side-by-side piles

ASJC Scopus subject areas

  • Civil and Structural Engineering


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