Effects of lifting force on bed topography and bed-surface sediment size in channel bend

Jiun Huei Jang, Hsin Ya Ho, Chin Lien Yen

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In bed-load sediment transport, the lifting force plays an important role in reducing the friction between sediment particles and the bed surface, and it makes particle transportation by the shear force easier. Because the lifting force is related to vorticity, a three-dimensional (3D) numerical model incorporating large eddy simulations was applied to simulate the vorticity field in a channel bend. The results show that the distribution of vorticity is highly nonuniform, and it can lead to significant variations in lifting force and bed-load sediment transport per unit width in a channel bend. Relevant theories are modified on the basis of physical reasoning and then incorporated into numerical models to investigate the lifting-force effects on the bed topography and bed-surface sediment size gradation in a channel bend. With the lifting-force effects considered, it is shown that the errors in simulated bed topography can be reduced by approximately 40% and in bed-surface sediment size by 50%.

Original languageEnglish
Pages (from-to)911-920
Number of pages10
JournalJournal of Hydraulic Engineering
Volume137
Issue number9
DOIs
Publication statusPublished - 2011 Sep 9

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Effects of lifting force on bed topography and bed-surface sediment size in channel bend'. Together they form a unique fingerprint.

Cite this