A study of relation between non-Bragg microwave radar backscattering and decimeter-scale wind waves

O. Danilicheva; I. Sergievskaya; S. Ermakov; O. Shomina; Alexander Kupaev; Ivan Kapustin

doi:10.1117/12.2600191

12 September 2021 A study of relation between non-Bragg microwave radar backscattering and decimeter-scale wind waves

O. Danilicheva, I. Sergievskaya, S. Ermakov, O. Shomina, Alexander Kupaev, Ivan Kapustin

Proceedings Volume 11857, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021; 118570M (2021) https://doi.org/10.1117/12.2600191
Event: SPIE Remote Sensing, 2021, Online Only

Abstract

The paper is focused on investigation of microwave backscattering from wind waves on a clean water surface. Field experiments were carried out in the coastal zone of the Black Sea using dual co-polarized Doppler X-band scatterometer and a three-band Doppler dual co-polarized radar (X-, С-, S-bands). The radar incidence angles were about 50 - 60 degrees, the wind changed in a wide range of speeds. We assumed that microwave backscattering at VV and HH polarizations is composed by a Bragg (polarized) component associated with Bragg waves and a non-polarized component (NBR). Analysis of Doppler spectra of NBR allowed us to remove the effect of strong wave breaking (overturning wave crests) from the time series and to study the backscatter associated only with dm-scale waves. Measurements of wind waves with a wire gauge were carried out simultaneously with the radar monitoring. It is shown that the velocities of non-Bragg scatterers not associated with strong wave breaking in X-, С-, S-bands correspond to the velocities of short dm waves and weakly depend on radar wavelength. The speeds of the scatterers in X-, С-, S-bands associated with overturning wave crests are also close to each other (within the measurement error). The intensity of NBR in X-, С-, S-bands grows with wind speed as well as with the intensity of dm-waves measured by the wire gauge. Strong suppression of NBR and simultaneously measured decrease of short dm-wave intensity are demonstrated, thus confirming the assumption that the intensity of the NBR in X-, С-, S-bands is determined by dm waves.

Conference Presentation

Citation Download Citation

O. Danilicheva, I. Sergievskaya, S. Ermakov, O. Shomina, Alexander Kupaev, and Ivan Kapustin "A study of relation between non-Bragg microwave radar backscattering and decimeter-scale wind waves", Proc. SPIE 11857, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021, 118570M (12 September 2021); https://doi.org/10.1117/12.2600191

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available