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1 January 2018 Impact of Model Resolution on Radar Imaging of Underwater Sand Waves
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Abstract

Yu, P.; Zhong, X., and Zhou, Y., 2018. Impact of model resolution on radar imaging of underwater sand waves.

Radar sensors are capable of imaging varying sea-surface roughness attributable to divergent and convergent current flow over underwater sand waves. This manifestation can be simulated and explored through a flow model combined with a radar-imaging model by explaining the interaction between bathymetry, currents, and surface waves. Accuracy of numerical models is usually limited by grid resolution; however, a lack of studies is present regarding the influence of grid resolution on the combined flow and radar-imaging model, which can determine the research scale of oceanic phenomena based on radar-imaging theory. To examine the role of grid size on imaging of distinct scales of sand ridges and to ignore other sources of surface-roughness variations in coastal areas, the authors designed an idealized flow model integrated with a radar-imaging model with different resolution. The results indicate that high-resolution synthetic aperture radar (SAR) images may be possible to detect bottom features smaller than 100 m. As the increasing grid resolution, surface-roughness variations can gradually reach a stable phase, indicating that the grid spacing should be elaborately selected according to the scale and complexity of underwater topography to fully present performance of the two-dimensional combined model. This model offers a reference to study the application of a radar-imaging mechanism or to analyze morphological changes based on SAR images and the combined system in coastal areas for future work.

©Coastal Education and Research Foundation, Inc. 2018
Peng Yu, Xiaojing Zhong, and Yunxuan Zhou "Impact of Model Resolution on Radar Imaging of Underwater Sand Waves," Journal of Coastal Research 34(1), (1 January 2018). https://doi.org/10.2112/JCOASTRES-D-16-00227.1
Received: 10 December 2016; Accepted: 7 March 2017; Published: 1 January 2018
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