Nearshore Monitoring With X-Band Radar: Maximizing Utility in Dynamic and Complex Environments
Authors: Atkinson, J., Esteves, L.S., Williams, J.J., Bell, P.S. and McCann, D.L.
Journal: Journal of Geophysical Research: Oceans
Volume: 126
Issue: 4
eISSN: 2169-9291
ISSN: 2169-9275
DOI: 10.1029/2020JC016841
Abstract:Coastal management and engineering applications require data that quantify the nature and magnitude of changes in nearshore bathymetry. However, bathymetric surveys are usually infrequent due to high costs and complex logistics. This study demonstrates that ground-based X-band radar offers a cost-effective means to monitor nearshore changes at relatively high frequency and over large areas. A new data quality and processing framework was developed to reduce uncertainties in the estimates of radar-derived bathymetry and tested using data from an 18-months installation at Thorpeness (UK). In addition to data calibration and validation, two new elements are integrated to reduce the influence of data scatter and outliers: (a) an automated selection of periods of “good data” and (b) the application of a depth-memory stabilization. For conditions when the wave height is >1 m, the accuracy of the radar-derived depths is shown to be ±0.5 m (95% confidence interval) at 40 × 40-m spatial resolution. At Thorpeness, radar-derived bathymetry changes exceeding this error were observed at time scales ranging from 3 weeks to 6 months. These data enabled quantification of changes in nearshore sediment volume at frequencies and spatial cover that would be difficult and/or expensive to obtain by other methods. It is shown that the volume of nearshore sediment movement occurring at time scale as short as few weeks are comparable with the annual longshore transport rates reported in this area. The use of radar can provide an early warning of changes in offshore bathymetry likely to impact vulnerable coastal locations.
https://eprints.bournemouth.ac.uk/35450/
Source: Scopus
Nearshore Monitoring With X-Band Radar: Maximizing Utility in Dynamic and Complex Environments
Authors: Atkinson, J., Esteves, L.S., Williams, J.J., Bell, P.S. and McCann, D.L.
Journal: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume: 126
Issue: 4
eISSN: 2169-9291
ISSN: 2169-9275
DOI: 10.1029/2020JC016841
https://eprints.bournemouth.ac.uk/35450/
Source: Web of Science (Lite)
Nearshore Monitoring with X-Band Radar: Maximising Utility in Dynamic and Complex Environments
Authors: Atkinson, J., Esteves, L., Williams, J., Bell, P. and McCann, D.
Journal: Earth and Space Science Open Archive
DOI: 10.1002/essoar.10504567.1
Abstract:Data quantifying the nature and range of bathymetric changes in the near-shore are required for coastal management and engineering works. However, due to high costs and complex logistics, bathymetric surveys are usually infrequent. This study demonstrates that ground-based X-band radar offers a cost-effective alternative to monitor seabed changes at relatively high frequency and over large near-shore areas. Through a robust data processing and quality control framework developed to validate radar-derived data and quantify uncertainties, bathymetric maps were obtained using an 18-month radar installation at Thorpeness, U.K. The analysis incorporates calibration of water levels and wave heights; validation of radar-derived water depth using concurrent multibeam surveys; the application of a method to reduce the influence of data scatter and outliers; and assessment of spatio-temporal variability of data quality due to varying wave heights and direction. For conditions when the wave height is >1 m, and the angle of wave approach relative to the radar is relatively small, the accuracy of the radar-derived depths is shown to be {plus minus}0.5 m at 40x40 m spatial resolution. At Thorpeness, quantification of changes exceeding this error was possible at time-scales as short as three weeks, and near-shore volume changes are seen to be of a comparable magnitude to historical longshore transport rates in the area. The use of radar can provide to coastal managers an early warning of changes in offshore bathymetry likely to impact vulnerable coastal locations; thereby allowing mobilisation of resources that may be required to protect lives and property.
https://eprints.bournemouth.ac.uk/35450/
https://www.essoar.org/doi/10.1002/essoar.10504567.1
Source: Manual
Nearshore Monitoring with X-Band Radar: Maximising Utility in Dynamic and Complex Environments
Authors: Atkinson, J., Esteves, L., Williams, J.J., Bell, P.S. and McCann, D.L.
Journal: Journal of Geophysical Research: Oceans
Volume: 126
Issue: 4
Publisher: American Geophysical Union
ISSN: 2169-9275
DOI: 10.1029/2020JC016841
Abstract:Coastal management and engineering applications require data that quantify the nature and magnitude of changes in nearshore bathymetry. However, bathymetric surveys are usually infrequent due to high costs and complex logistics. This study demonstrates that ground‐based X‐band radar offers a cost‐effective means to monitor nearshore changes at relatively high frequency and over large areas. A new data quality and processing framework was developed to reduce uncertainties in the estimates of radar‐derived bathymetry and tested using data from an 18‐month installation at Thorpeness (UK). In addition to data calibration and validation, two new elements are integrated to reduce the influence of data scatter and outliers: (a) an automated selection of periods of ‘good data’ and (b) the application of a depth‐memory stabilisation. For conditions when the wave height is >1 m, the accuracy of the radar‐derived depths is shown to be ±0.5 m (95% confidence interval) at 40x40 m spatial resolution. At Thorpeness, radar‐derived bathymetry changes exceeding this error were observed at timescales ranging from three weeks to six months. These data enabled quantification of changes in nearshore sediment volume at frequencies and spatial cover that would be difficult and/or expensive to obtain by other methods. It is shown that the volume of nearshore sediment movement occurring at timescale as short as few weeks are comparable with the annual longshore transport rates reported in this area. The use of radar can provide an early warning of changes in offshore bathymetry likely to impact vulnerable coastal locations.
https://eprints.bournemouth.ac.uk/35450/
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020JC016841
Source: Manual
Nearshore Monitoring with X-Band Radar: Maximising Utility in Dynamic and Complex Environments
Authors: Atkinson, J., Esteves, L.S., Williams, J.J., Bell, P.S. and McCann, D.L.
Journal: Journal of Geophysical Research: Oceans
Volume: 126
Issue: 4
ISSN: 2169-9275
Abstract:Coastal management and engineering applications require data that quantify the nature and magnitude of changes in nearshore bathymetry. However, bathymetric surveys are usually infrequent due to high costs and complex logistics. This study demonstrates that ground‐based X‐band radar offers a cost‐effective means to monitor nearshore changes at relatively high frequency and over large areas. A new data quality and processing framework was developed to reduce uncertainties in the estimates of radar‐derived bathymetry and tested using data from an 18‐month installation at Thorpeness (UK). In addition to data calibration and validation, two new elements are integrated to reduce the influence of data scatter and outliers: (a) an automated selection of periods of ‘good data’ and (b) the application of a depth‐memory stabilisation. For conditions when the wave height is >1 m, the accuracy of the radar‐derived depths is shown to be ±0.5 m (95% confidence interval) at 40x40 m spatial resolution. At Thorpeness, radar‐derived bathymetry changes exceeding this error were observed at timescales ranging from three weeks to six months. These data enabled quantification of changes in nearshore sediment volume at frequencies and spatial cover that would be difficult and/or expensive to obtain by other methods. It is shown that the volume of nearshore sediment movement occurring at timescale as short as few weeks are comparable with the annual longshore transport rates reported in this area. The use of radar can provide an early warning of changes in offshore bathymetry likely to impact vulnerable coastal locations.
https://eprints.bournemouth.ac.uk/35450/
Source: BURO EPrints