Nearshore monitoring with X‐Band Radar: maximizing utility in dynamic and complex environments

Atkinson, J.; Esteves, L. S.; Williams, J. J.; Bell, P.S. ORCID: https://orcid.org/0000-0002-4673-4822; McCann, D.L. ORCID: https://orcid.org/0000-0003-4428-700X. 2021 Nearshore monitoring with X‐Band Radar: maximizing utility in dynamic and complex environments. Journal of Geophysical Research: Oceans, 126 (4). https://doi.org/10.1029/2020JC016841

Before downloading, please read NORA policies.

Preview

Text 2020JC016841.pdf - Published Version Available under License Creative Commons Attribution 4.0. Download (2MB) | Preview

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2020JC016841
ISSN:	2169-9275
Date made live:	26 Aug 2021 18:39 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/530939

Actions (login required)

View Item

Document Downloads

More statistics for this item...