Advanced

Ship-Generated Waves and Induced Turbidity in the Gota alv River in Sweden

Goransson, Gunnel; Larson, Magnus LU and Althage, Jonas (2014) In Journal of Waterway, Port, Coastal and Ocean Engineering 140(3).
Abstract
Ship-generated waves were investigated in the Gota alv river, which is a major waterway on the Swedish west coast between the sea and Lake Vanern. Ships with a typical size of 85x15x5 m (lengthxwidthxdraft) travel at speeds between 5 and 10 knots, generating waves that cause sediment transport and erosion along the river bed and banks. Field measurements of the wave properties and turbidity were carried out during 17 ship passages, and comparisons were made with the most commonly used formulas for predicting ship waves. The formula proposed by the Permanent International Association of Navigation Congresses yielded the overall best agreement for the divergent (secondary) waves, whereas the drawdown (primary wave) could best be estimated... (More)
Ship-generated waves were investigated in the Gota alv river, which is a major waterway on the Swedish west coast between the sea and Lake Vanern. Ships with a typical size of 85x15x5 m (lengthxwidthxdraft) travel at speeds between 5 and 10 knots, generating waves that cause sediment transport and erosion along the river bed and banks. Field measurements of the wave properties and turbidity were carried out during 17 ship passages, and comparisons were made with the most commonly used formulas for predicting ship waves. The formula proposed by the Permanent International Association of Navigation Congresses yielded the overall best agreement for the divergent (secondary) waves, whereas the drawdown (primary wave) could best be estimated from the vessel sinkage. The maximum recorded turbidity was mainly a function of the drawdown, and it could be well predicted from the parameterized bed shear stress. In conclusion, ship waves often induce bed and bank erosion in restricted waterways and, although simplistic formulas involve significant uncertainties, they are still useful tools for predictions. However, more studies are needed to determine the influence of a limited river cross section on the wave generation and the relationship between ship waves and sediment transport. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Drawdown, Ship waves, Secondary waves, Turbidity, Predictive equations, Waterway, Primary waves
in
Journal of Waterway, Port, Coastal and Ocean Engineering
volume
140
issue
3
publisher
American Society of Civil Engineers (ASCE)
external identifiers
  • wos:000334423900009
  • scopus:84921344331
ISSN
0733-950X
DOI
10.1061/(ASCE)WW.1943-5460.0000224
language
English
LU publication?
yes
id
91998e1a-f359-4def-95ac-d887779ca11b (old id 4438870)
date added to LUP
2014-05-21 13:57:20
date last changed
2017-11-19 04:00:14
@article{91998e1a-f359-4def-95ac-d887779ca11b,
  abstract     = {Ship-generated waves were investigated in the Gota alv river, which is a major waterway on the Swedish west coast between the sea and Lake Vanern. Ships with a typical size of 85x15x5 m (lengthxwidthxdraft) travel at speeds between 5 and 10 knots, generating waves that cause sediment transport and erosion along the river bed and banks. Field measurements of the wave properties and turbidity were carried out during 17 ship passages, and comparisons were made with the most commonly used formulas for predicting ship waves. The formula proposed by the Permanent International Association of Navigation Congresses yielded the overall best agreement for the divergent (secondary) waves, whereas the drawdown (primary wave) could best be estimated from the vessel sinkage. The maximum recorded turbidity was mainly a function of the drawdown, and it could be well predicted from the parameterized bed shear stress. In conclusion, ship waves often induce bed and bank erosion in restricted waterways and, although simplistic formulas involve significant uncertainties, they are still useful tools for predictions. However, more studies are needed to determine the influence of a limited river cross section on the wave generation and the relationship between ship waves and sediment transport.},
  author       = {Goransson, Gunnel and Larson, Magnus and Althage, Jonas},
  issn         = {0733-950X},
  keyword      = {Drawdown,Ship waves,Secondary waves,Turbidity,Predictive equations,Waterway,Primary waves},
  language     = {eng},
  number       = {3},
  publisher    = {American Society of Civil Engineers (ASCE)},
  series       = {Journal of Waterway, Port, Coastal and Ocean Engineering},
  title        = {Ship-Generated Waves and Induced Turbidity in the Gota alv River in Sweden},
  url          = {http://dx.doi.org/10.1061/(ASCE)WW.1943-5460.0000224},
  volume       = {140},
  year         = {2014},
}