Wind-directional effects on the hydrodynamic modulation of microwave radar images of ocean waves
作者:
F.J. OCAMPO-TORRES,
I.S. ROBINSON,
期刊:
International Journal of Remote Sensing
(Taylor Available online 1989)
卷期:
Volume 10,
issue 8
页码: 1339-1355
ISSN:0143-1161
年代: 1989
DOI:10.1080/01431168908903972
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A numerical simulation has been constructed of the hydrodynamic modulation transfer function (HMTF) which defines the spatial and spectral properties of swell waves as observed by an imaging radar. While the simulation is based on the Alpers and Hasselmann (1978) two-scale modulation transfer model, it explicitly takes account of directional properties of the short-wave spectrum and does not necessarily assume an isotropic wind-wave spectrum. Several different spreading functions are modelled and it is demonstrated that an anisotropic wind wave field significantly distorts the HMTF. Depending on the wind direction relative to the radar azimuth, the effect can be to shift the direction and the wave number of the peak of the image spectrum relative to the true swell spectrum. The effect of fetch limitation on the wind-wave spectrum is also examined based on the JONSWAP spectrum, but the consequences of this for the HMTF imaging mechanism are found to be minimal.
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