| Autor: |
Ryabkova, M.1 m.rjabkova@gmail.com, Karaev, V.1, Guo, J.2,3,4 jguo@yic.ac.cn, Titchenko, Yu.1 |
| Předmět: |
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| Zdroj: |
Journal of Geophysical Research. Oceans. Oct2019, Vol. 124 Issue 10, p7104-7134. 31p. |
| Abstrakt: |
The most common models of the wind wave spectrum are reviewed, and the compliance of the studied spectra with several fundamental criteria is estimated. These criteria are the ability to simulate diverse wave climate and agreement between model‐based calculations of the mean square slope and experimental data. The spreading function of the spectrum should also correspond to the experimentally measured Doppler spectrum, while the dependence of the radar backscatter cross section should conform to geophysical model functions for various wavelength ranges of incident electromagnetic radiation at moderate incidence angles (20–60°). An analysis has shown that none of the considered spectrum models fully satisfies all the criteria; thus, a new spectrum model for wind waves was developed. Boundary wave numbers for various wavelength ranges of incident electromagnetic radiation within the framework of a two‐scale surface model were determined for the new model. The spectrum model can be used to simulate ripple attenuation in oil slicks and to calculate the radar backscatter cross section inside slick. Plain Language Summary: Wave frequency spectra describe the distribution of wave energy over wave frequencies. They are used for numerical simulation of the sea surface. There are a lot of measurements of wind‐generated gravity waves spectrum; as for waves of smaller wavelengths, they are more difficult to measure in field experiments, while laboratory experiments do not show the same statistics as an actual sea. To combine the available in situ and laboratory measurements of spectra in various wavelength ranges, researchers have developed a variety of models of the wave spectrum; each model is aimed at solving a specific problem. In this paper, we make a comparative analysis of the spectrum models developed by T. Elfouhaily, P. A. Hwang, V. N. Kudryavtsev, and V. Yu. Karaev with their coauthors and present a new spectrum model that eliminates some drawbacks inherent in other models. It should be emphasized that the new wave spectrum model is not a complete and precise oceanographic description of waves. The aim of our work is to develop a wave spectrum model, which is based on known oceanographic and radar data and can be used for numerical estimates in studying microwave electromagnetic wave scattering from the sea surface. Key Points: A comparative analysis of the spectrum models developed by Elfouhaily, Hwang, Kudryavtsev, and Karaev with their coauthors was madeKaraev spectrum model was modified on the basis of the gravity‐capillary waves field measurementsThe advantage of the modified spectrum more adequately describes MSS and the RCS than other models and is convenient for use [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
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