A shoreline detection method with X-band marine radar

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY Continental Shelf Research Pub Date : 2024-04-18 DOI:10.1016/j.csr.2024.105233

Wendy Navarro , Juan C. Velez , Alejandro Orfila

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Abstract

The assessment of morphological mapping capacity of X-band radars is performed by comparing radar-derived shoreline estimates with in-situ data measured from DGPS-RTK surveys in Cala Millor beach (October 22–24, 2018). Radar estimates are obtained by applying an automatic method based on digital image processing, threshold segmentation and first-order derivative filters on X-Band radar variance images. The study site is covered by the endemic Posidonia oceanica seagrass meadow at the seabed. It represents a challenge on the estimation of local shoreline. Results reveal that X-band radar estimate the shoreline location with a mean bias of 4.66 m, a relative error of 2.95% and a RMSE of 14.07 m. Also, the beach morphology is assessed by the identification of surrounding rocky outcrops and a submerged sandbar. Since the obtained radar estimation errors are comparable with the reported by previous studies but using video-cameras, results reveal a potential complementary use of both marine radars and optical cameras to provide higher-resolution and more accurate shoreline measurements in a broader area.

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利用 X 波段海洋雷达探测海岸线的方法

通过比较雷达得出的海岸线估计值与在卡拉米洛尔海滩（2018 年 10 月 22-24 日）进行的 DGPS-RTK 勘测所测量的现场数据，对 X 波段雷达的形态测绘能力进行了评估。雷达估算值是通过对 X 波段雷达方差图像应用基于数字图像处理、阈值分割和一阶导数滤波器的自动方法获得的。研究地点的海底覆盖着特有的 Posidonia oceanica 海草草甸。这对估计当地海岸线是一个挑战。结果显示，X 波段雷达估算的海岸线位置平均偏差为 4.66 米，相对误差为 2.95%，均方根误差为 14.07 米。由于所获得的雷达估算误差与之前使用视频摄像机的研究报告不相上下，研究结果揭示了海洋雷达和光学摄像机的互补使用潜力，可在更大范围内提供更高分辨率和更精确的海岸线测量结果。

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.