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UBC Theses and Dissertations
Infiltration effects on cross-shore sedimnet transport Elliott, Trevor Ross
Abstract
Theory is reviewed which relates infiltration into a permeable beach with the net onshore or offshore transport of sediment by wave action. This theory is tested experimentally by using sands of different permeability and by using underdrains in the beach and a pump to increase the infiltration capacity. Previous studies are reviewed, although these earlier studies have had different purposes. Some prior investigations have studied wave propagation over a permeable slope or have determined wave damping and energy dissipation due to percolation into a porous bed. Other studies have investigated wave interactions with permeable structures such as rubblemound breakwaters and have shown that the exchange of fluid between the external and internal flow regions markedly affects wave uprush, backrush and set-up in the surf zone. A limited number of previous studies have considered the flow of fluid into a permeable beach and its role in beach stabilization and erosion control. The present tests were performed in the wave flume of the Hydraulics Laboratory of the Department of Civil Engineering at the University of British Columbia. Intermediate and equilibrium beach profiles are presented and compared. The findings of this study indicate substantial differences between impermeable and porous material. Experimental results show more permeable beaches form steeper profiles, while less permeable beaches form shallower profiles. Moreover, increasing infiltration by pumping initiates immediate onshore sediment motion and considerable steepening of the cross-sectional profile. To a large extent this steepening process was reversible when pumping was stopped. The results of this study confirm the predictions of the theory that infiltration contributes directly to a net onshore stress and onshore sediment transport.
Item Metadata
Title |
Infiltration effects on cross-shore sedimnet transport
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1995
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Description |
Theory is reviewed which relates infiltration into a permeable beach with the net onshore
or offshore transport of sediment by wave action. This theory is tested experimentally by
using sands of different permeability and by using underdrains in the beach and a pump to
increase the infiltration capacity. Previous studies are reviewed, although these earlier
studies have had different purposes. Some prior investigations have studied wave
propagation over a permeable slope or have determined wave damping and energy
dissipation due to percolation into a porous bed. Other studies have investigated wave
interactions with permeable structures such as rubblemound breakwaters and have shown
that the exchange of fluid between the external and internal flow regions markedly affects
wave uprush, backrush and set-up in the surf zone. A limited number of previous studies
have considered the flow of fluid into a permeable beach and its role in beach
stabilization and erosion control. The present tests were performed in the wave flume of
the Hydraulics Laboratory of the Department of Civil Engineering at the University of
British Columbia. Intermediate and equilibrium beach profiles are presented and
compared. The findings of this study indicate substantial differences between
impermeable and porous material. Experimental results show more permeable beaches
form steeper profiles, while less permeable beaches form shallower profiles. Moreover,
increasing infiltration by pumping initiates immediate onshore sediment motion and
considerable steepening of the cross-sectional profile. To a large extent this steepening
process was reversible when pumping was stopped. The results of this study confirm the
predictions of the theory that infiltration contributes directly to a net onshore stress and
onshore sediment transport.
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Extent |
4385754 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-01-31
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0050397
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.