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SAR Detection of Ship-Generated Turbulent and Vortex Wakes

1985
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Release : 1985
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Book Synopsis SAR Detection of Ship-Generated Turbulent and Vortex Wakes by : J. D. Lyden

Download or read book SAR Detection of Ship-Generated Turbulent and Vortex Wakes written by J. D. Lyden. This book was released on 1985. Available in PDF, EPUB and Kindle. Book excerpt: A frequently observed ship wake feature in Synthetic Aperture Radar (SAR) images is a dark, narrow line along the ship track. These features have been termed turbulent wakes, although it is not clear that turbulence alone is responsible for their appearance. It has been suggested that vortices produced by the ship's hull may be responsible for the suppression of surface waves near the ship track and an enhancement of the waves near the edge of the smoothed area. The primary purpose of this study was to use a hydrodynamic model for ship-generated vortices as input to existing radar backscatter models, and to use this hybrid model to produce simulated SAR ship wake signatures for comparison with actual measurements. For the limited number of cases considered, the simulated wake signatures agreed closely to those observed in actual SAR data. Our results also indicated that the SAR signatures are related to the vortex currents under low wind conditions and to the strain rates associated with the ship-generated vortices under high winds. Additional studies included the radar resolution dependence of SAR ship wake features as well as examination of the Fourier transform of a ship wake image for information which could be used in an automatic detection algorithm. Keywords: Radar images; Radar/ship signatures; Optical radar; Surface waves perturbations.

Remote Sensing of Turbulence

2021-10-04 Technology & Engineering
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Release : 2021-10-04
Genre : Technology & Engineering
Kind : eBook
Book Rating : 806/5 ( reviews)

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Book Synopsis Remote Sensing of Turbulence by : Victor Raizer

Download or read book Remote Sensing of Turbulence written by Victor Raizer. This book was released on 2021-10-04. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a unique multidisciplinary integration of the physics of turbulence and remote sensing technology. Remote Sensing of Turbulence provides a new vision on the research of turbulence and summarizes the current and future challenges of monitoring turbulence remotely. The book emphasizes sophisticated geophysical applications, detection, and recognition of complex turbulent flows in oceans and the atmosphere. Through several techniques based on microwave and optical/IR observations, the text explores the technological capabilities and tools for the detection of turbulence, their signatures, and variability. FEATURES Covers the fundamental aspects of turbulence problems with a broad geophysical scope for a wide audience of readers Provides a complete description of remote-sensing capabilities for observing turbulence in the earth’s environment Establishes the state-of-the-art remote-sensing techniques and methods of data analysis for turbulence detection Investigates and evaluates turbulence detection signatures, their properties, and variability Provides cutting-edge remote-sensing applications for space-based monitoring and forecasts of turbulence in oceans and the atmosphere This book is a great resource for applied physicists, the professional remote sensing community, ecologists, geophysicists, and earth scientists.

Symposium on Naval Hydrodynamics

1986 Fluid dynamics
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Release : 1986
Genre : Fluid dynamics
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Book Synopsis Symposium on Naval Hydrodynamics by :

Download or read book Symposium on Naval Hydrodynamics written by . This book was released on 1986. Available in PDF, EPUB and Kindle. Book excerpt:

Using Ship Wake Patterns to Evaluate Sar Ocean Wave Imaging Mechanisms

1985 Artificial satellites
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Release : 1985
Genre : Artificial satellites
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Book Synopsis Using Ship Wake Patterns to Evaluate Sar Ocean Wave Imaging Mechanisms by : R. R. Hammond

Download or read book Using Ship Wake Patterns to Evaluate Sar Ocean Wave Imaging Mechanisms written by R. R. Hammond. This book was released on 1985. Available in PDF, EPUB and Kindle. Book excerpt: The Joint Ocean Wave Investigation Project (JOWIP) was conducted to evaluate the detectability of ocean wave structures on imaging synthetic aperture radar (SAR). This project used Kelvin surface ship wake patterns generated under controlled and well documented surface environmental conditions to isolate SAR image parameters. Use of waves of known wavelength and direction provide the opportunity to evaluate the SAR contribution to ocean wave forecasting. SEASAT-like images made with L-band SAR are presented: (1) to suggest how ship-generated surface roughness combines with the velocity-bunching mechanism in calm ocean areas to produce the unusually narrow wakes observed for azimuth-traveling ships on SEASAT images; and (2) to estimate conditions under which SAR image modulation mechanisms can be expected to produce wake images. A method is described for using the Kelvin transverse ship wake wave component to quantitatively evaluate the contributions of various SAR ocean wave imaging mechanisms. It makes use of the narrow sector of surface roughness generated by a ship along its track to produce SAR images of the longest waves in its wake system on flat calm water.

Advances in Passive Microwave Remote Sensing of Oceans

2024-09-05 Technology & Engineering
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Release : 2024-09-05
Genre : Technology & Engineering
Kind : eBook
Book Rating : 860/5 ( reviews)

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Book Synopsis Advances in Passive Microwave Remote Sensing of Oceans by : Victor Raizer

Download or read book Advances in Passive Microwave Remote Sensing of Oceans written by Victor Raizer. This book was released on 2024-09-05. Available in PDF, EPUB and Kindle. Book excerpt: This new edition introduces the fundamentals of passive microwave remote sensing of oceans, including the physical principles of microwave radiometry, novel observational data, their interpretation, and applications. It not only demonstrates and examines the recent advantages and state of the art of microwave data but also provides guidance for explaining complex ocean studies and advanced applications. All chapters are thoroughly updated with detailed analysis of space‐based microwave missions, and a new chapter on space‐based microwave radiometer experiments has been added. This book discusses the power of microwave remote sensing as an efficient tool for diagnostics of ocean phenomena in research and education. Features New to this Edition: • Includes a new chapter and additional data, images, illustrations, and references. • Uses ocean microwave data, acquired from different platforms, to illustrate different methods of analysis and interpretation. • Updates information on recent and important satellite missions dedicated to microwave remote sensing of oceans. • Offers more detailed analysis of multiband microwave data and images. • Provides examples of microwave data that cover different ocean environmental phenomena and hydro‐physical fields, including global and local ocean features. • Presents additional material on advanced applications, including detection capabilities. This book is intended for postgraduate students and professionals working in fields related to remote sensing, geography, oceanography, civil, environmental, and geotechnical engineering.

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