Download e-book for iPad: Breaking Ocean Waves: Geometry, Structure, and Remote by Eugene A. Sharkov

By Eugene A. Sharkov

ISBN-10: 3540298274

ISBN-13: 9783540298274

ISBN-10: 3540298282

ISBN-13: 9783540298281

This publication represents the main complete description of the actual findings of an research into the spatio-temporal features of the gravity of breaking waves and the froth task in open sea by means of tools and tools of optical and microwave distant sensing.

The examine of actual and electrodynamics' houses of the gravity wave breaking approaches and the froth spatio-temporal job is a crucial side of satellite tv for pc oceanography, ocean engineering, air-sea interplay and ocean distant sensing. particularly, the contribution of froth formations of assorted kinds to the suggest and the spatio-temporal adaptations of radio emission, back-scattering, IR and optical parameters of the disturbed sea floor is very major. The statistical features of wave breaking and attendant foam forming are vitally important to ocean wave dynamics. The research and size of spatio-temporal features of wave breaking and sea foam formations are of basic value in ocean distant sensing.

Much emphasis is put on the actual points of breaking strategies essential to degree the probabilities and boundaries of distant sensing equipment in particular remark situations of an oceanic floor. a variety of useful purposes and illustrations are supplied from air-borne, ship-borne and laboratory updated experiments.

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Additional resources for Breaking Ocean Waves: Geometry, Structure, and Remote Sensing

Example text

Sections along (1) and across (2) the main direction of two-dimensional spatial spectra SI , SII , SIII , SIV , obtained as sea state increases. 2). Spectra SII ±SIV were normalized on the following basis: SII …150† À1 ; SIII …150† À2 ; SIV …150† À3 . SZ …jkj†. 4Ðwhich presents the results of contact measurements, transformed into the space of wavenumbers, and the single-point spectrum of altitudes SZ …jkj; †, restored from optical measurements (at an accuracy of a constant multiplier)Ðshows that the latter not only correctly re¯ects the general spectral dependence throughout the range of wavenumbers studied of about six octaves, but also coincides with the contact spectrum in details.

This dependence, obtained by Grushin et al. (1990), is well approxi~ À0:33 , which is well known from the data of mated by the exponential dependence  some experiments (Carter, 1982). In the given case the numerical coecient is about 40% higher than that accepted in early approximations. Of interest is the fact that under full fetch conditions (X ˆ 250 km) the f~m value almost precisely corresponds to the dimensionless frequency value obtained from the Pirson±Moskowitz spectrum of a developed sea state ( f~m ˆ 0:13) (Pierson and Moskowitz, 1964).

It can easily be seen that the wave age relations c=uà ! 30 are also satis®ed for X > 200 km (Papadimitrakis, 2005a,b) (where c is the phase velocity of a gravity wave corresponding to the spectrum maximum frequency), and for the dimensionless fetch the inequality Xg=u 2à > 4 Á 10 7 is met, which characterizes a fully developed sea state according to the data by Volkov (1968). 4 [Ch. 2 Restoration of the spectral characteristics of the sea surface from its optical images To restore the spatial spectral characteristics of the large-scale sea wave ®eld throughout the crossing of measurements, we applied the special technique for restoring the spectral characteristics of a rough surface from its optical images obtained by aerial survey (Lupyan and Sharkov, 1990).

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Breaking Ocean Waves: Geometry, Structure, and Remote Sensing by Eugene A. Sharkov

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