Extraction of wind direction from the HF hybrid sky-surface wave radar sea echoes

Chu, Xiaoliang; Zhang, Jie; Ji, Yonggang; Wang, Yiming; Yang, Longquan

doi:10.1109/maes.2018.8336816

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…In particular, for phased-array radars for which wind measurement has been subject of many validations and has been accepted as a reliable measurement, accurate wind directions are available when the firstorder Bragg waves can be expected to be locally wind-driven [22]. Recent implementations of inversion techniques [13][14][15][16], including the use of neural networks [19,66,67], may improve the working capability of HFrs even in presence of calm conditions, enlarging the potential applications of these systems even in operational contexts.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies on HFr wind direction retrieval using different procedures demonstrate that the effectiveness of inversion methods from radar backscatter measurements is critically dependent on the wind intensity [15][16][17][18][19][20][21]. Thus, under preliminary sensitivity tests and based on literature indications, we set a lower wind speed threshold at 5 m/s for the comparisons among platforms [15][16][17][18][19][20][21]. Comparisons between all the 12 RCs, in situ measurements and model data were additionally conducted to determine the difference of HFr wind direction retrieval along RCs.…”

Section: Methodsmentioning

confidence: 99%

“…The first numerical model to extract the wind direction from HFr backscatter was suggested by Long and Trizna [10]. In recent decades, different research groups developed algorithms for the extraction of wind direction [11][12][13][14][15][16][17][18], including also a neural network method [19] applied for wind field inversion. To date, however, no robust algorithms for a reliable measurement of wind speed are available.…”

Section: Introductionmentioning

confidence: 99%

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Wind Direction Data from a Coastal HF Radar System in the Gulf of Naples (Central Mediterranean Sea)

et al. 2021

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Results on the accuracy of SeaSonde High Frequency (HF) radar wind direction measurements in the Gulf of Naples (Southern Tyrrhenian Sea, Central Mediterranean Sea) are here presented. The investigation was carried out for a winter period (2th February–6th March) and for one summer month (August) of the reference year 2009. HF radar measurements were compared with in situ recordings from a weather station and with model data, with the aim of resolving both small scale and large scale dynamics. The analysis of the overall performance of the HF radar system in the Gulf of Naples shows that the data are reliable when the wind speed exceeds a 5 m/s threshold. Despite such a limitation, this study confirms the potentialities of these systems as monitoring platforms in coastal areas and suggests further efforts towards their improvement.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wind Direction Data from a Coastal HF Radar System in the Gulf of Naples (Central Mediterranean Sea)

et al. 2021

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“…Heron [8,9] and Huang et al [10] presented excellent work on the factors to be considered in developing algorithms for the extraction of wind direction using one radar station. Chu et al [11] applied the multi-beam method for wind direction inversion from a hybrid skywave radar. It is clear from References [12,13] that the spreading parameter used in describing the directional distribution of the ocean waves may have a critical influence on determining the wind directions.…”

Section: Introductionmentioning

confidence: 99%

Wind Direction Inversion from Narrow-Beam HF Radar Backscatter Signals in Low and High Wind Conditions at Different Radar Frequencies

Shen

Gurgel

2018

Remote Sensing

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Land-based, high-frequency (HF) surface wave radar has the unique capability of monitoring coastal surface parameters, such as current, waves, and wind, up to 200 km off the coast. The Doppler spectrum of the backscattered radar signal is characterized by two strong peaks that are caused by the Bragg-resonant scattering from the ocean surface. The wavelength of Bragg resonant waves is exactly half the radio wavelength (grazing incidence), and these waves are located at the higher frequency part of the wave spectral distribution. When HF radar operates at higher frequencies, the resonant waves are relatively shorter waves, which are more sensitive to a change in wind direction, and they rapidly respond to local wind excitation and a change in wind direction. When the radar operates at lower frequencies, the corresponding resonant waves are relatively longer and take longer time to respond to a change in wind direction due to the progress of wave growth from short waves to long waves. For the wind inversion from HF radar backscatter signals, the accuracy of wind measurement is also relevant to radar frequency. In this paper, a pattern-fitting method for extracting wind direction by estimating the wave spreading parameter is presented, and a comparison of the pattern-fitting method and a conventional method is given as well, which concludes that the pattern-fitting method presents better results than the conventional method. In order to analyze the wind direction inversion from radar backscatter signals under different wind conditions and at different radar frequencies, two radar experiments accomplished in Norway and Italy are introduced, and the results of wind direction inversion are presented. In the two experiments, the radar worked at 27.68 MHz and 12 MHz, respectively, and the wind conditions at the sea surface were quite different. In the experiment in Norway, 67.4% of the wind records were higher than 5 m/s, while, in the experiment in Italy, only 18.9% of the wind records were higher than 5 m/s. All these factors affect the accuracy of wind direction inversion. The paper analyzes the radar data and draws a conclusion on the influencing factor of wind direction inversion.

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“…The first model to extract the wind direction from HFR backscatter was suggested by Long and Trizna (1972). In recent decades, different research groups developed algorithms for the extraction of wind direction (Zeng et al, 2018;Chu et al, 2018;Hisaki, 2017;Kirincich, 2016;Shen et al, 2012;Heron, 2002;Huang et al, 2004;Gurgel et al, 2006) and more recently also a neural network method was applied for wind field inversion (Zeng et al, 2016).…”

Section: Wind Measurement Retrieval From Hfrsmentioning

confidence: 99%

Coastal HF radars in the Mediterranean: status of operations and a framework for future development

Lorente

Aguiar

Bendoni³

et al. 2021

Preprint

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Abstract. Due to the semi-enclosed nature of the Mediterranean Sea, natural disasters and anthropogenic activities impose stronger pressures on its coastal ecosystems than in any other sea of the world. With the aim of responding adequately to science priorities and societal challenges, littoral waters must be effectively monitored with High-Frequency radar (HFR) systems. This land-based remote sensing technology can provide, in near real-time, fine-resolution maps of the surface circulation over broad coastal areas, along with reliable directional wave and wind information. The main goal of this work is to showcase the current status of the Mediterranean HFR network and the future roadmap for orchestrated actions. Ongoing collaborative efforts and recent progress of this regional alliance are not only described but also connected with other European initiatives and global frameworks, highlighting the advantages of this cost-effective instrument for the multi-parameter monitoring of the sea state. Coordinated endeavours between HFR operators from different multi-disciplinary institutions are mandatory to reach a mature stage at both national and regional levels, striving to: i) harmonize deployment and maintenance practices; ii) standardize data, metadata and quality control procedures; iii) centralize data management, visualization and access platforms; iv) develop practical applications of societal benefit, that can be used for strategic planning and informed decision-making in the Mediterranean marine environment. Such fit-for-purpose applications can serve for search and rescue operations, safe vessel navigation, tracking of marine pollutants, the monitoring of extreme events or the investigation of transport processes and the connectivity between offshore waters and coastal ecosystems. Finally, future prospects within the Mediterranean framework are discussed along with a wealth of socio-economic, technical and scientific challenges to be faced during the implementation of this integrated HFR regional network.

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Extraction of wind direction from the HF hybrid sky-surface wave radar sea echoes

Cited by 6 publications

References 14 publications

Wind Direction Data from a Coastal HF Radar System in the Gulf of Naples (Central Mediterranean Sea)

Wind Direction Data from a Coastal HF Radar System in the Gulf of Naples (Central Mediterranean Sea)

Wind Direction Inversion from Narrow-Beam HF Radar Backscatter Signals in Low and High Wind Conditions at Different Radar Frequencies

Coastal HF radars in the Mediterranean: status of operations and a framework for future development

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