Scattering from breaking gravity waves without wind

被引：33

作者：

Lee, PHY ^{[1
]}

Barter, JD ^{[1
]}

Beach, KL ^{[1
]}

Lake, BM ^{[1
]}

Rungaldier, H ^{[1
]}

Thompson, HR ^{[1
]}

Yee, R ^{[1
]}

机构：

[1] TRW Space & Elect, Redondo Beach, CA 90278 USA

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 1998年 / 46卷 / 01期

关键词：

sea surface electromagnetic scattering;

D O I：

10.1109/8.655447

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Scattering experiments from breaking gravity waves conducted at a wave tank facility at small grazing angles in the absence of wind are analyzed, Breaking gravity waves are studied using a fully plane polarimetric horizontal (HH), vertical (VV), vertically transmitted and horizontally received polarization (VH), and horizontally transmitted and vertically received polarization (HV) pulse-chirped X-band radar in conjunction with optical instruments: the plane polarimetric optical specular event detector (OSED) and side-looking camera(SLC), Spatially and temporally resolved radar backscatter has been measured and temporally correlated to the data obtained from the optical diagnostics. The experiments yield the following results: 1) enhanced scattering compared to Bragg scattering levels occurs throughout the evolutionary process of wave-breaking, i.e., the radar scatters strongly from both the unbroken and broken surfaces; 2) an explanation is found for the observation that the scatterer Doppler frequency is slightly less than the Doppler frequency corresponding to the fundamental wave phase speed; 3) a representative non-Bragg cross section of a breaking wave can be obtained; and 4) a breaking wave surface is found to be an efficient depolarizer.

引用

页码：14 / 26

页数：13

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