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A numerical simulation of the shape of submerged breakwater to minimize mean water level rise and wave transmission

Uemura, Takahiro (2013) In TVVR13/5004 VVRM01 20131
Division of Water Resources Engineering
Abstract
It has been widely reported that coastal erosion causes problems worldwide. In order to solve these problems, breakwaters have been constructed in such regions. However, it is also a fact that breakwaters adversely affect the environment and scenery. To be able to prevent coastal erosion, while still preserving the environment and the view, submerged breakwaters have been introduced. However, submerged breakwaters have been shown to have a major flaw: they tend to increase the mean water level behind the breakwater, which in turn is a factor causing further erosion of the coast. One example of such a scenario is the west coast of Niigata, Japan. In order to minimize this mean water level rise, a number of studies have been carried out, but... (More)
It has been widely reported that coastal erosion causes problems worldwide. In order to solve these problems, breakwaters have been constructed in such regions. However, it is also a fact that breakwaters adversely affect the environment and scenery. To be able to prevent coastal erosion, while still preserving the environment and the view, submerged breakwaters have been introduced. However, submerged breakwaters have been shown to have a major flaw: they tend to increase the mean water level behind the breakwater, which in turn is a factor causing further erosion of the coast. One example of such a scenario is the west coast of Niigata, Japan. In order to minimize this mean water level rise, a number of studies have been carried out, but most of them do not reduce either the mean water level or the wave transmission sufficiently. Therefore, this paper aims to develop the shape of the submerged bank to minimize both the mean water level rise and the wave transmission. A numerical calculation in two dimensions has been carried out under the assumption that the submerged bank is of great length. Calculations are done for both submerged banks modeled after existing banks in Niigata, and for long, low submerged banks with several vertical impermeable plates. The obtained results were compared to each other in regards of spectrum analysis, mean water level, significant wave heights behind the bank, and significant wave height in long waves. The newly-introduced submerged bank showed high efficiency in minimizing the mean water level and wave transmission. Furthermore, the submerged bank could minimize the transmission of long waves, which shows great promise for future implementation. (Less)
Please use this url to cite or link to this publication:
author
Uemura, Takahiro
supervisor
organization
course
VVRM01 20131
year
type
H2 - Master's Degree (Two Years)
subject
publication/series
TVVR13/5004
report number
13/5004
ISSN
1101-9824
language
English
additional info
Examiner: Hans Hanson
id
7512329
date added to LUP
2015-07-06 09:32:16
date last changed
2019-03-29 10:18:35
@misc{7512329,
  abstract     = {It has been widely reported that coastal erosion causes problems worldwide. In order to solve these problems, breakwaters have been constructed in such regions. However, it is also a fact that breakwaters adversely affect the environment and scenery. To be able to prevent coastal erosion, while still preserving the environment and the view, submerged breakwaters have been introduced. However, submerged breakwaters have been shown to have a major flaw: they tend to increase the mean water level behind the breakwater, which in turn is a factor causing further erosion of the coast. One example of such a scenario is the west coast of Niigata, Japan. In order to minimize this mean water level rise, a number of studies have been carried out, but most of them do not reduce either the mean water level or the wave transmission sufficiently. Therefore, this paper aims to develop the shape of the submerged bank to minimize both the mean water level rise and the wave transmission. A numerical calculation in two dimensions has been carried out under the assumption that the submerged bank is of great length. Calculations are done for both submerged banks modeled after existing banks in Niigata, and for long, low submerged banks with several vertical impermeable plates. The obtained results were compared to each other in regards of spectrum analysis, mean water level, significant wave heights behind the bank, and significant wave height in long waves. The newly-introduced submerged bank showed high efficiency in minimizing the mean water level and wave transmission. Furthermore, the submerged bank could minimize the transmission of long waves, which shows great promise for future implementation.},
  author       = {Uemura, Takahiro},
  issn         = {1101-9824},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVVR13/5004},
  title        = {A numerical simulation of the shape of submerged breakwater to minimize mean water level rise and wave transmission},
  year         = {2013},
}