Abstract
Wave reflections from dredge channels are an important consideration for coastal infrastructure. A physical model study of a proposed development for the Port of Townsville demonstrated that channel reflection, and the relatively poorly understood channel concentration are significant processes that need to be considered in coastal developments. The study showed that channel reflection and channel concentration can significantly transform the local waves, resulting in complex multidirectional wave fields and higher design wave conditions.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/XsKsofNZzvQ
Highlights
There is very little information available on this process, since it can have dramatic effects on breakwater heads, seawalls, beaches and harbors
A 3D physical modelling study of wave processes for the Port of Townsville showed that waves do not reflect from all directions described by the classic reflection theory
This paper presents the findings of the modelling study
Summary
Gravity wave reflections from steep sided channels are recognised in coastal engineering literature as a potential problem for many harbours with dredged approach channels and at some rare coastal features, Channel reflections typically increase wave heights on the seaward side of the channel, while reducing wave energy leeward of the channel. A 3D physical modelling study of wave processes for the Port of Townsville showed that waves do not reflect from all directions described by the classic reflection theory. Even under bimodal wave conditions it was shown that channel concentration significantly increased the wave climate at the channel edge. The study showed that channel reflection and channel concentration can significantly transform the local waves, resulting in multidirectional wave fields and higher design wave conditions. They should be an important consideration for infrastructure and coastal management in regions with dredge channels. Very little energy is lost and reflected wave heights are close to that of the incident, and a diamond pattern wave field results
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