Doppler Spectrum Analysis of Time-Evolving Sea Surface Covered by Oil Spills  

作　　者：杨鹏举 郭立新 贾春刚 

机构地区：[1]School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071 [2]State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071

出　　处：《Chinese Physics Letters》2015年第4期45-48,共4页中国物理快报（英文版）

基　　金：Supported by the National Science Foundation for Distinguished Young Scholars of China under Grant No 61225002;the Aeronautical Science Fund and Aviation Key Laboratory of Science and Technology on AISSS of China under Grant No20132081015

摘　　要：Based on the model of a contaminated sea surface that was proposed by Lombardini et al., the influence of the damping effect of oil films on the sea surface roughness spectrum and the geometrical structure of the sea surface is examined in detail by comparing with a clean sea surface. Fhrthermore, based on a quasi-stationary algorithm, a time series of backscattered echoes from a time-evolving sea surface covered by oil slicks is obtained by utilizing the frequency-domain numerical method of the parallel fast multiple method. Then, the Doppler spectrum is evaluated by performing a standard spectral estimation technique. Finally, the influence of the oil film damping effect on the Doppler spectrum of the backscattered echoes from time-evolving sea surface is investigated in detail by making a comparison of the Doppler spectrum of an oil-covered sea surface with the Doppler spectrum of a dean sea surface. The numerical simulations show that the damping effect of oil films has an influence on the Doppler spectrum signature for both horizontal-to-horizontal and vertical-to-vertical polarizations.Based on the model of a contaminated sea surface that was proposed by Lombardini et al., the influence of the damping effect of oil films on the sea surface roughness spectrum and the geometrical structure of the sea surface is examined in detail by comparing with a clean sea surface. Fhrthermore, based on a quasi-stationary algorithm, a time series of backscattered echoes from a time-evolving sea surface covered by oil slicks is obtained by utilizing the frequency-domain numerical method of the parallel fast multiple method. Then, the Doppler spectrum is evaluated by performing a standard spectral estimation technique. Finally, the influence of the oil film damping effect on the Doppler spectrum of the backscattered echoes from time-evolving sea surface is investigated in detail by making a comparison of the Doppler spectrum of an oil-covered sea surface with the Doppler spectrum of a dean sea surface. The numerical simulations show that the damping effect of oil films has an influence on the Doppler spectrum signature for both horizontal-to-horizontal and vertical-to-vertical polarizations.

关 键 词：Doppler Spectrum Analysis of Time-Evolving Sea Surface Covered by Oil Spills 

分 类 号：X55[环境科学与工程—环境工程] X87