On the Interpretation of Coherent Marine Radar Backscatter From Surf Zone Waves

Streßer, Michael; Seemann, J.; Carrasco, Ruben; Cysewski, Marius; Horstmann, Jochen; Baschek, Burkard; Deane, Grant B.

doi:10.1109/tgrs.2021.3103417

Cited by 9 publications

(15 citation statements)

References 76 publications

(67 reference statements)

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“…However, this is not straight forward because the estimation of the Doppler speeds from scanning radar data is noisier. Therefore the Doppler peak separation algorithm (Streβer et al., 2021) that was used in the present study is not applicable. The sensitivity of the method to an oblique imaging of the incoming waves must also be tested further.…”

Section: Discussion and Outlookmentioning

confidence: 95%

“…The reason for this additional Doppler shift U graz is still not well understood. It involves complicated interactions of steep waves and shadowing at spatial scales smaller than the radar resolution (Miret et al., 2014), or pulse‐smearing artifacts (Streβer et al., 2021). The speed of the Bragg waves U Bragg is constant.…”

Section: Field Observations At Bunkerhill Beach Syltmentioning

confidence: 99%

“…The Doppler shift frequency f D is determined from the location of the Doppler peaks along the frequency axis as described by Streβer et al. (2021). In some cases, multiple peaks are found in the Doppler spectra.…”

Section: Field Observations At Bunkerhill Beach Syltmentioning

confidence: 99%

“…For such multi‐peaked spectra, only the slowest peak is considered. The velocity of the slower peaks was found to be best suited to trace the non‐breaking surface with only minor influence of radar pulse smearing artifacts (Streβer et al., 2021).…”

Section: Field Observations At Bunkerhill Beach Syltmentioning

confidence: 99%

“…However, Streβer et al. (2021) showed that radar pulse smearing can lead to signal artifacts at the rear sides of steep and breaking waves. There is a high chance that Doppler velocity observed in this region is invalid.…”

Section: Radar‐derived Dissipationmentioning

confidence: 99%

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Surface Wave and Roller Dissipation Observed With Shore‐Based Doppler Marine Radar

2022

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The Earth's coastlines are facing sea level rise and increased human interventions. Predicting long-term coastal changes is of major importance to ensure efficient planning and design of coastal structures, as well as sustainable management of the coastal zone. Furthermore, a proper incorporation of nearshore processes into earth system models is required to efficiently predict the future changes of the coastal morphology, that is, coastal morphodynamics. Long-term measurements of nearshore hydrodynamics, in particular the spatial distribution of wave heights, are rarely available but often required to develop, validate, or calibrate parameterizations of nearshore processes.Breaking surface waves are important drivers of nearshore hydro-and morphodynamics. When a wave breaks, its height and thus the energy that is contained in the wave motion at the scale of the breaker decreases. The vast majority of the extracted wave energy is irreversibly converted (dissipated) to currents (slowly varying mean flow, e.g., Longuet-Higgins & Stewart, 1964), vorticity (Clark et al., 2012, turbulence (chaotic oscillations at higher frequencies, e.g., Feddersen & Trowbridge, 2005), heat (e.g., Sinnett & Feddersen, 2014), sea spray (Van Eijk et al., 2011), sound and air entrainment (Deane, 1997), and re-suspension of sediments (Voulgaris & Collins, 2000). Therefore, wave breaking and the associated wave energy dissipation link the wave energy flux to mixing and sediment transport. A "direct measurement of wave dissipation is equivalent to measuring the forcing for nearshore flow" (Holman & Haller, 2013). However, deployment and maintenance of in-situ sensors (e.g.,

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Section: Discussion and Outlookmentioning

confidence: 95%

Section: Field Observations At Bunkerhill Beach Syltmentioning

confidence: 99%

Section: Field Observations At Bunkerhill Beach Syltmentioning

confidence: 99%

Section: Field Observations At Bunkerhill Beach Syltmentioning

confidence: 99%

Section: Radar‐derived Dissipationmentioning

confidence: 99%

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