CG
C. Gaido
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Cliff Erosion at Point Grey UBC
A feasibility study of preliminary concepts to deal with erosion
Erosion of the cliffs at the Point Grey Peninsula threatens important infrastructure and buildings at UBC. In order to tackle this problem, UBC launched a comprehensive project called Living Breakwaters. This project is part of Living Breakwaters and aims to act as a transversal element among different expertise, integrating these specializations into a holistic framework. It analyses the problem from a technical, environmental, economic, legislative and social perspective. Four concepts are proposed to tackle the erosion and their key feasibility issues are identified. Accordingly, the main goal of this report is to present a clear and holistic framework of the erosion problem at the Point Grey cliffs, both gathering and integrating existing information and contributing with innovative ideas that might open new approaches for dealing with erosion. In conclusion, the Point Grey cliff erosion is a problem that has to be tackled to prevent severe damage to the adjacent lands. It is advised to combine both marine and subaerial measures. An integrated approach combining technical, environmental, legislative and social expertise is recommended in order to achieve a truly sustainable design.
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Erosion of the cliffs at the Point Grey Peninsula threatens important infrastructure and buildings at UBC. In order to tackle this problem, UBC launched a comprehensive project called Living Breakwaters. This project is part of Living Breakwaters and aims to act as a transversal element among different expertise, integrating these specializations into a holistic framework. It analyses the problem from a technical, environmental, economic, legislative and social perspective. Four concepts are proposed to tackle the erosion and their key feasibility issues are identified. Accordingly, the main goal of this report is to present a clear and holistic framework of the erosion problem at the Point Grey cliffs, both gathering and integrating existing information and contributing with innovative ideas that might open new approaches for dealing with erosion. In conclusion, the Point Grey cliff erosion is a problem that has to be tackled to prevent severe damage to the adjacent lands. It is advised to combine both marine and subaerial measures. An integrated approach combining technical, environmental, legislative and social expertise is recommended in order to achieve a truly sustainable design.
Low-lying islands are highly vulnerable to wave-induced flooding, with low-frequency waves (frequency <0.04Hz) being one of the main drivers. The impact of these inundations can increase due to wave resonance over coral reefs, which
has been observed in the range of low-frequency waves. This study aims to
understand the reef resonance phenomenon along with processes that could limit its resonant amplification over wave height and wave run-up.
A numerical experiment was carried out based on a 1D SWASH numerical model.
A cross-shore profile of a schematized fringing coral reef was built, and resonance was forced over this bathymetry for the first two resonant modes and two water depths. The offshore forcing was designed as a simplified wave climate, with small amplitude regular low-frequency waves.
Resonance was found to occur in a bandwidth of periods for each resonant mode, generating two resonant amplification peaks (one for each resonant mode). The periods leading to the maximum resonant amplification inside each resonant bandwidth are the modeled resonant periods, which were found to be longer than the theoretical resonant periods (based on reef flat width and water depth). The resonant amplification over wave height and run-up were found to be more significant for the fundamental mode than for the first mode, decreasing for both resonant modes when increasing the water depth. Moreover, for the wave conditions modeled in this experiment, the relative resonant amplification was found to be stronger for smaller wave heights than larger wave heights.
Reef wave resonance presented a build-up behavior, needing a minimum number of waves to reach a maximum resonant amplification, which varied depending on the wave period, wave height, and water depth. Resonant amplification was found to increase for a larger amount of trapped wave energy over the reef and lower friction dissipation. Frictional dissipation was found to be the most effective process to counteract wave resonant amplification. Thus, increasing coral reef bottom friction is essential for enhancing low-lying island coastal safety.
...
Low-lying islands are highly vulnerable to wave-induced flooding, with low-frequency waves (frequency <0.04Hz) being one of the main drivers. The impact of these inundations can increase due to wave resonance over coral reefs, which
has been observed in the range of low-frequency waves. This study aims to
understand the reef resonance phenomenon along with processes that could limit its resonant amplification over wave height and wave run-up.
A numerical experiment was carried out based on a 1D SWASH numerical model.
A cross-shore profile of a schematized fringing coral reef was built, and resonance was forced over this bathymetry for the first two resonant modes and two water depths. The offshore forcing was designed as a simplified wave climate, with small amplitude regular low-frequency waves.
Resonance was found to occur in a bandwidth of periods for each resonant mode, generating two resonant amplification peaks (one for each resonant mode). The periods leading to the maximum resonant amplification inside each resonant bandwidth are the modeled resonant periods, which were found to be longer than the theoretical resonant periods (based on reef flat width and water depth). The resonant amplification over wave height and run-up were found to be more significant for the fundamental mode than for the first mode, decreasing for both resonant modes when increasing the water depth. Moreover, for the wave conditions modeled in this experiment, the relative resonant amplification was found to be stronger for smaller wave heights than larger wave heights.
Reef wave resonance presented a build-up behavior, needing a minimum number of waves to reach a maximum resonant amplification, which varied depending on the wave period, wave height, and water depth. Resonant amplification was found to increase for a larger amount of trapped wave energy over the reef and lower friction dissipation. Frictional dissipation was found to be the most effective process to counteract wave resonant amplification. Thus, increasing coral reef bottom friction is essential for enhancing low-lying island coastal safety.