LABORATORY STUDY OF THE FINE STRUCTURE OF BREAKING WAVES FOR SCATTEROMETRY APPLICATIONS - Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Futur
نویسندگان
چکیده
Laboratory measurements of the fine space-time structure of short gravity-capillary waves, as well as Ku-band scattering at grazing and moderate incidence from spilling and plunging breaking waves in a wave channel are presented. Unsteady breaking waves are generated by focusing the waves in space and time. A scanning laser slope gauge was used for measuring short waves of wavelength 0.2-20cm, and frequencies up to 150Hz. A dual polarized (VV, HH) coherent pulsed Ku-band scatterometer with good temporal resolution (3ns) was used to simultaneously obtain Doppler spectra of the scattered signals from the breaking area. It was found that the breaking splash is the main source of small-scale surface-wave generation. The short surface wave slope field produced by the breaking could be separated into regular short (5 1 Omm wavelength), fast, bound waves, and free gravity-capillary waves. Both types of waves were found to COand counter-propagate relative to the direction of the dominant wave propagation. Measurements of the Doppler frequency of the scattered signal are consistent with this description of the slope gauge
منابع مشابه
Detail-Preserving Segmentation of Polarimetric SAR Imagery - Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Futur
Polarimetric SAR data help researchers understand and quantify the scattering properties of natural scenes, and their variability under different conditions, better than single polarization SAR data. In this paper, we propose two detailpreserving segmentation algorithms for multiband images and evaluate their performance using real multi-frequency multipolarization SAR complex data. Adaptive ne...
متن کاملEdge Detection in Speckled SAR Images Using the Continuous Wavelet Transform - Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Futur
This study presents an original method to detect edges in Synthetic Aperture Radar images corrupted by speckle. We show that the Continuous Wavelet Transform (CWT) allows to accurately detect edges embedded in speckle. Edges give rise to a conic signature in the CWT. Furthermore, the Signal t o Noise Ratio (SNR) increases with the scale of the CWT. The optimal wavelet maximizing the SNR is deri...
متن کاملREDUCING THE EFFECTS OF SPACE-VARYING WAVELENGTH-DEPENDENT SCATTERING IN MULTISPECTRAL IMAGERY - Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Futur
A new method for reducing space-varying, wavelength-dependent scattering in multispectral imagery caused by smoke and haze is described. It is intended for use in situations where atmospheric scattering affects the shorter wavelengths and varies in space. The method converts an image in which space-varying scattering is present into an image where the scattering has been equalized over the enti...
متن کاملEstimation of the Ocean/Atmosphere Eloundary Layer Height of Water Vapor from Space - Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Futur
A new retrieval technique has been developed which resolves some of the vertical structure of lower tropospheric water vapor over Oceans from space. 'The relationship is demonstrated by comparisons between direct measurements of the water vapor profile, by radiosondes, and coincident estimates of the horizontal turbulence structure of Integrated Water Vapor, wing the TOPEX Microwave Radiometer ...
متن کاملSoil Moisture Retrieval Using the Danish L- & C-Band Polarimetric SAR - Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Futur
Danish polarimetric SAR data have been applied t o estimate soil moisture (SM). The preliminary results evaluated with the Land C-band SAR dat,a acquired at the Danish test site Foulum during a number of missions in 1994 and 1995 are presented. In situ data have been collected during the SAR missions and the variations of SM at field scale are discussed. The Integral Equation El]. In addition, ...
متن کامل