Cross-shore sediment transport with deep-water toe conditions

Coastal defence structures play a critical role in safeguarding the underlying coast from wave action under both storm and normal conditions. Sea level rise due to global warming continues to place more coastal cities under increasingly harsh wave conditions that threaten their stability. In Sin...

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Main Author: Ang, Chevy Kai Long
Other Authors: Law Wing-Keung, Adrian
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2024
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Online Access:https://hdl.handle.net/10356/177356
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1773562024-05-31T15:34:39Z Cross-shore sediment transport with deep-water toe conditions Ang, Chevy Kai Long Law Wing-Keung, Adrian School of Civil and Environmental Engineering CWKLAW@ntu.edu.sg Engineering Coastal engineering Beach drainage system Desalination plant Soft engineering Beach stabilisation XBeach Coastal defence structures play a critical role in safeguarding the underlying coast from wave action under both storm and normal conditions. Sea level rise due to global warming continues to place more coastal cities under increasingly harsh wave conditions that threaten their stability. In Singapore, the Urban Redevelopment Authority announced the development of a “Long Island” along Singapore’s East Coast. Using traditional hard engineering structures like sea walls would not be ideal as it limits access to East Coast Park and alter the aesthetics of the beach permanently. Thus, a soft engineering solution such as a Beach Drainage System (BDS) can be used to promote accretion of sand and stabilise the beach profile without sacrificing the aesthetics. Traditionally, Beach Drainage Systems pump out seawater from the beach which might have higher operational costs than hard engineering solutions. However, in Singapore, it is possible to use the pumped, sand filtered seawater as an input for its desalination plants to facilitate cost sharing such that it is as economically feasible as other hard engineering solutions This paper uses XBeach to numerically simulate and assess the impact of a Beach Drainage System under overseas extreme storm wave conditions, Singapore storm wave conditions and normal Singapore wave conditions. Using XBeach, different beach drainage locations are tested to test the impact of location on the efficacy on such a system and different discharge volume conditions that mirror the intake volume of a typical desalination plant in Singapore can also be simulated. The results are then processed to check the cumulative impact on the beach erosion or sedimentation and the impact on the variance in bed level for the beach. The results from the XBeach simulation show that the BDS is effective at promoting beach stability under extreme storm conditions, although the results are mixed on what is the optimal location and discharge volume to cause accretion of sand or increased beach stability. The results for overseas extreme wave conditions showed decreased mean cumulative erosion and decreased bed level variance. However, under Singapore localised conditions, the Beach Drainage system did not seem to have such a significant impact. This might be evidence that under the milder wave conditions of Singapore, a Beach Drainage system requires a longer time scale to be effective. Since the Beach Drainage system has shown to operate somewhat effectively under more extreme storm wave conditions, it should also operate effectively under milder wave conditions, but the effects might require more time to show. Thus, this paper provides further evidence to suggest that a Beach Drainage System might be effective at countering the effect of wave action to promote beach accretion and overall stability. Bachelor's degree 2024-05-28T01:08:41Z 2024-05-28T01:08:41Z 2024 Final Year Project (FYP) Ang, C. K. L. (2024). Cross-shore sediment transport with deep-water toe conditions. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/177356 https://hdl.handle.net/10356/177356 en WR-13 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Coastal engineering
Beach drainage system
Desalination plant
Soft engineering
Beach stabilisation
XBeach
spellingShingle Engineering
Coastal engineering
Beach drainage system
Desalination plant
Soft engineering
Beach stabilisation
XBeach
Ang, Chevy Kai Long
Cross-shore sediment transport with deep-water toe conditions
description Coastal defence structures play a critical role in safeguarding the underlying coast from wave action under both storm and normal conditions. Sea level rise due to global warming continues to place more coastal cities under increasingly harsh wave conditions that threaten their stability. In Singapore, the Urban Redevelopment Authority announced the development of a “Long Island” along Singapore’s East Coast. Using traditional hard engineering structures like sea walls would not be ideal as it limits access to East Coast Park and alter the aesthetics of the beach permanently. Thus, a soft engineering solution such as a Beach Drainage System (BDS) can be used to promote accretion of sand and stabilise the beach profile without sacrificing the aesthetics. Traditionally, Beach Drainage Systems pump out seawater from the beach which might have higher operational costs than hard engineering solutions. However, in Singapore, it is possible to use the pumped, sand filtered seawater as an input for its desalination plants to facilitate cost sharing such that it is as economically feasible as other hard engineering solutions This paper uses XBeach to numerically simulate and assess the impact of a Beach Drainage System under overseas extreme storm wave conditions, Singapore storm wave conditions and normal Singapore wave conditions. Using XBeach, different beach drainage locations are tested to test the impact of location on the efficacy on such a system and different discharge volume conditions that mirror the intake volume of a typical desalination plant in Singapore can also be simulated. The results are then processed to check the cumulative impact on the beach erosion or sedimentation and the impact on the variance in bed level for the beach. The results from the XBeach simulation show that the BDS is effective at promoting beach stability under extreme storm conditions, although the results are mixed on what is the optimal location and discharge volume to cause accretion of sand or increased beach stability. The results for overseas extreme wave conditions showed decreased mean cumulative erosion and decreased bed level variance. However, under Singapore localised conditions, the Beach Drainage system did not seem to have such a significant impact. This might be evidence that under the milder wave conditions of Singapore, a Beach Drainage system requires a longer time scale to be effective. Since the Beach Drainage system has shown to operate somewhat effectively under more extreme storm wave conditions, it should also operate effectively under milder wave conditions, but the effects might require more time to show. Thus, this paper provides further evidence to suggest that a Beach Drainage System might be effective at countering the effect of wave action to promote beach accretion and overall stability.
author2 Law Wing-Keung, Adrian
author_facet Law Wing-Keung, Adrian
Ang, Chevy Kai Long
format Final Year Project
author Ang, Chevy Kai Long
author_sort Ang, Chevy Kai Long
title Cross-shore sediment transport with deep-water toe conditions
title_short Cross-shore sediment transport with deep-water toe conditions
title_full Cross-shore sediment transport with deep-water toe conditions
title_fullStr Cross-shore sediment transport with deep-water toe conditions
title_full_unstemmed Cross-shore sediment transport with deep-water toe conditions
title_sort cross-shore sediment transport with deep-water toe conditions
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/177356
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