Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/16669
Title: A study on the formation of bed forms in rivers and coastal waters
Authors: MA PEIFENG
Keywords: dunes, sandwaves, coastal, tidal flow, wind wave effects
Issue Date: 16-Feb-2009
Source: MA PEIFENG (2009-02-16). A study on the formation of bed forms in rivers and coastal waters. ScholarBank@NUS Repository.
Abstract: In this study, mechanisms of bed form generation are investigated by linear instability analysis. The analysis suggests that the slope factor and the perturbed bed shear stress are the two key parameters under bed-load dominant sediment transport conditions. A bed-load transport model and the associated slope factor are validated and strongly supported by laboratory data. A slip velocity model (SV-model) based on constant eddy viscosity and a GM-model based on linearly varying eddy viscosity are proposed to predict the perturbed bed stress. The proper correlation between eddy viscosity and slip factor, neglected in most previous studies, is considered in the SV-model. The GM-model predicts more realistic near-bed velocity profiles. The effects of wind waves are taken into account for the first time in the present study. The models are applied to predict dunes in rivers and sand waves in coastal waters with reasonable success.
URI: http://scholarbank.nus.edu.sg/handle/10635/16669
Appears in Collections:Ph.D Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
PhD_Thesis_MaPeifeng_160209.pdf1.51 MBAdobe PDF

OPEN

NoneView/Download

Page view(s)

337
checked on Dec 18, 2017

Download(s)

256
checked on Dec 18, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.