An assessment of four decades of wave power variability - a critical requirement for coastal resilience
Wave power estimates and trend assessments are crucial for coastal management and resilience, as increases in wave power introduces significant risks of flooding and shoreline erosion. This study evaluates wave power trends at 29 National Oceanic and Atmospheric Administration (NOAA) National Data B...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Faculty of Science
2022
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Online Access: | http://hdl.handle.net/11427/37314 https://open.uct.ac.za/bitstream/11427/37314/1/thesis_sci_2022_hall%20candice.pdf |
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ftunivcapetownir:oai:localhost:11427/37314 2023-05-15T17:36:22+02:00 An assessment of four decades of wave power variability - a critical requirement for coastal resilience Hall, Candice Ansorge, Isabel Jensen, Robert E Wang, David W 2022_ application/pdf http://hdl.handle.net/11427/37314 https://open.uct.ac.za/bitstream/11427/37314/1/thesis_sci_2022_hall%20candice.pdf eng eng Faculty of Science Department of Oceanography http://hdl.handle.net/11427/37314 https://open.uct.ac.za/bitstream/11427/37314/1/thesis_sci_2022_hall%20candice.pdf Oceanography Doctoral Thesis Doctoral PhD 2022 ftunivcapetownir 2023-03-10T00:14:48Z Wave power estimates and trend assessments are crucial for coastal management and resilience, as increases in wave power introduces significant risks of flooding and shoreline erosion. This study evaluates wave power trends at 29 National Oceanic and Atmospheric Administration (NOAA) National Data Buoy Center (NDBC) moored buoy sites with associated U.S. Army Corps of Engineers (USACE) Wave Information Study model estimates within the North Pacific Ocean, Hawaiian Islands, Gulf of Mexico and North Atlantic Ocean. This work is the first conclusive study to show spatially and temporally comparative observational and model wave power results, providing new information on the accuracy of model estimates using wave power as a proxy. Wave power data were interpolated to augment missing values and detrended for seasonality to facilitate testing of interannual and interdecadal trends in wave power. Results show that the majority of the eastern Pacific Ocean and Hawaii wave power trends are downward, with mixed slope wave power trends apparent within the Atlantic Ocean and Gulf of Mexico. Observational and model results show that wave power peaks in long term interannual trends are similar with respect to timing, but not magnitude. Variability in the wave power trend direction within each region suggests that site specific wave power trends should not be generalised to represent a large region, with regionally grouped annual maximum 90th percentiles obscuring the variability of individual site results. Prior to the calculation of these wave power estimates, a thorough interrogation of the quality of the observational wave data was conducted. Three tasks achieved confidence in these observational datasets: a) an evaluation of the effects of changing NDBC instrumentation technologies on data quality; b) the development of an independent, self describing, archive that mitigates for historical data storage issues; and c) the subsequent removal of identified discontinuities within the time series datasets. Instrumented buoy ... Doctoral or Postdoctoral Thesis North Atlantic University of Cape Town: OpenUCT Pacific |
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University of Cape Town: OpenUCT |
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ftunivcapetownir |
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English |
topic |
Oceanography |
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Oceanography Hall, Candice An assessment of four decades of wave power variability - a critical requirement for coastal resilience |
topic_facet |
Oceanography |
description |
Wave power estimates and trend assessments are crucial for coastal management and resilience, as increases in wave power introduces significant risks of flooding and shoreline erosion. This study evaluates wave power trends at 29 National Oceanic and Atmospheric Administration (NOAA) National Data Buoy Center (NDBC) moored buoy sites with associated U.S. Army Corps of Engineers (USACE) Wave Information Study model estimates within the North Pacific Ocean, Hawaiian Islands, Gulf of Mexico and North Atlantic Ocean. This work is the first conclusive study to show spatially and temporally comparative observational and model wave power results, providing new information on the accuracy of model estimates using wave power as a proxy. Wave power data were interpolated to augment missing values and detrended for seasonality to facilitate testing of interannual and interdecadal trends in wave power. Results show that the majority of the eastern Pacific Ocean and Hawaii wave power trends are downward, with mixed slope wave power trends apparent within the Atlantic Ocean and Gulf of Mexico. Observational and model results show that wave power peaks in long term interannual trends are similar with respect to timing, but not magnitude. Variability in the wave power trend direction within each region suggests that site specific wave power trends should not be generalised to represent a large region, with regionally grouped annual maximum 90th percentiles obscuring the variability of individual site results. Prior to the calculation of these wave power estimates, a thorough interrogation of the quality of the observational wave data was conducted. Three tasks achieved confidence in these observational datasets: a) an evaluation of the effects of changing NDBC instrumentation technologies on data quality; b) the development of an independent, self describing, archive that mitigates for historical data storage issues; and c) the subsequent removal of identified discontinuities within the time series datasets. Instrumented buoy ... |
author2 |
Ansorge, Isabel Jensen, Robert E Wang, David W |
format |
Doctoral or Postdoctoral Thesis |
author |
Hall, Candice |
author_facet |
Hall, Candice |
author_sort |
Hall, Candice |
title |
An assessment of four decades of wave power variability - a critical requirement for coastal resilience |
title_short |
An assessment of four decades of wave power variability - a critical requirement for coastal resilience |
title_full |
An assessment of four decades of wave power variability - a critical requirement for coastal resilience |
title_fullStr |
An assessment of four decades of wave power variability - a critical requirement for coastal resilience |
title_full_unstemmed |
An assessment of four decades of wave power variability - a critical requirement for coastal resilience |
title_sort |
assessment of four decades of wave power variability - a critical requirement for coastal resilience |
publisher |
Faculty of Science |
publishDate |
2022 |
url |
http://hdl.handle.net/11427/37314 https://open.uct.ac.za/bitstream/11427/37314/1/thesis_sci_2022_hall%20candice.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/11427/37314 https://open.uct.ac.za/bitstream/11427/37314/1/thesis_sci_2022_hall%20candice.pdf |
_version_ |
1766135836685893632 |