A laboratory study of strong modulation of radar signals due to long waves on the water surface covered with a surfactant film

被引：4

作者：

Ermakov S.A. ^{[1
]}

Sergievskaya I.A. ^{[1
]}

Shchegolkov Y.B. ^{[1
]}

机构：

[1] Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod

来源：

Radiophysics and Quantum Electronics | 2002年 / 45卷 / 12期

基金：

俄罗斯基础研究基金会;

关键词：

Backscatter modulation - Gravity capillary waves - Laboratory studies - Modulation coefficients - Radar backscatter - Relative intensity - Surfactant concentrations - Wind wave spectrum;

D O I：

10.1023/A:1023577315602

中图分类号：

学科分类号：

摘要：

Modulation of radar backscatter due to long wind waves in the presence of surfactant films is studied for the first time under wave-tankconditions. It is found that the modulation coefficient can increase significantly with increasing surfactant concentration. We show that the existing theoretical models of modulation of free surface waves underestimate the observed modulation levels. It is demonstrated that the experimental radar Doppler shifts cannot be explained by only the scattering due to free gravity-capillary waves (GCW) and are also determined by coupled waves, which are nonlinear harmonics of the longer wind wave components. Estimates of the relative intensity of coupled waves in the wind-wave spectrum at the Bragg wavelength are presented. It is shown that the contribution of coupled waves is considerable and increases with increasing surfactant concentration, thus confirming the hypothesis for a “cascade” mechanism of strong backscatter modulation in the long-wave field. © 2002 Plenum Publishing Corporation.

引用

页码：942 / 957

页数：15

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