气候变化领域集成服务门户(CCPortal): Rapid wavelet-based bathymetry inversion method for nearshore X-band radars

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DOI	10.1016/j.rse.2020.111688
	Rapid wavelet-based bathymetry inversion method for nearshore X-band radars
	Chernyshov P.; Vrecica T.; Streßer M.; Carrasco R.; Toledo Y.
发表日期	2020
ISSN	00344257
卷号	240
英文摘要	A wavelet based method for bathymetry retrieval from X-band radar images is proposed. The method combines traditional Fast Fourier Transform techniques for retrieving peak frequency maps by evaluating the spectral peaks in the time domain, and a localized 2D Continuous Wavelet Transform for retrieving the corresponding peak wavenumbers. The main improvements of the new method compared to conventional FFT-based methods are as follows: a) the wavelet-based approach is localized - naturally fitting the inhomogeneous conditions typically found in the nearshore environment; b) it is continuous and uses wave phase information providing smooth bathymetry maps with good accuracy (RMSE in the range 2.6–6.6% of the maximum water depth); c) it requires relatively small number of successive images without the limitation of requiring a uniform time step. In order to verify the proposed method, 2D simulations of wave shoaling and refraction were performed for different sea conditions and over several bottom topographies. A radar image model including tilt and shadowing modulations together with speckle noise was applied to the simulated surface elevations to provide synthetic radar images. The method's ability to reconstruct the original bathymetry is shown to be robust in intermediate to shallow water depths (kph < 1) for all cases. The method was also applied to real data acquired in Sylt island (Germany). A comparison between a bathymetric survey held prior to a storm and a radar reconstructed one during the storm shows very good agreement. These results reassure the high capability of this new method to be used in operational settings. © 2020 Elsevier Inc.
英文关键词	Bathymetry reconstruction; Shoaling waves; Wavelet analysis; X-band radar
语种	英语
scopus关键词	Bathymetry; Fast Fourier transforms; Hydrographic surveys; Image enhancement; Radar; Radar imaging; Storms; Wavelet analysis; Wavelet transforms; Bathymetry reconstruction; Continuous Wavelet Transform; Inhomogeneous conditions; Shallow water depths; Shoaling waves; Wavelet-based approach; Wavelet-based methods; X-band Radars; Time domain analysis; bathymetric survey; image analysis; numerical method; radar; shallow water; shoaling wave; wavelet analysis; Germany; North Frisian Islands; Schleswig-Holstein; Sylt
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179431
作者单位	Tel Aviv University, School of Mechanical Engineering, Tel Aviv, 6997801, Israel; Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Straße 1, Geesthacht, 21502, Germany
推荐引用方式 GB/T 7714	Chernyshov P.,Vrecica T.,Streßer M.,et al. Rapid wavelet-based bathymetry inversion method for nearshore X-band radars[J],2020,240.
APA	Chernyshov P.,Vrecica T.,Streßer M.,Carrasco R.,&Toledo Y..(2020).Rapid wavelet-based bathymetry inversion method for nearshore X-band radars.Remote Sensing of Environment,240.
MLA	Chernyshov P.,et al."Rapid wavelet-based bathymetry inversion method for nearshore X-band radars".Remote Sensing of Environment 240(2020).