Determination of initial tsunami wave shape at sea surface

The use of remotely wave sensing by a marine radar is increasingly needed to provide wave information for the sake of safety and operational effectiveness in many offshore activities. Reconstruction of radar images needs to be carried out since radar images are a poor representation of the sea surface elevation: effects like shadowing and tilt determine the backscattered intensity of the images. In [1], the sea state reconstruction and wave propagation to the radar has been tackled successfully for synthetic radar images of linear seas, except for a scaling in the vertical direction. The determination of the significant wave height from the shadowed images only has been described in [2]. This paper will summarize these methods, and provides the first results for the extension to nonlinear seas.

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Determination of sea surface temperature at large observation angles using an angular and emissivity-dependent split-window equation

Remote Sensing of Environment ◽

10.1016/j.rse.2007.03.014 ◽

2007 ◽

Vol 111 (1) ◽

pp. 107-121 ◽

Cited By ~ 32

Author(s):

Raquel Niclòs ◽

Vicente Caselles ◽

César Coll ◽

Enric Valor

Keyword(s):

Surface Temperature ◽

Sea Surface Temperature ◽

Sea Surface ◽

Large Observation

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The determination of sea surface wind and temperature with airborne radiometric data

Proceedings of IGARSS '93 - IEEE International Geoscience and Remote Sensing Symposium ◽

10.1109/igarss.1993.322071 ◽

2002 ◽

Cited By ~ 5

Author(s):

V.S. Etkin ◽

A.V. Kuzmin ◽

M.N. Pospelov ◽

A.I. Smirnov ◽

V.V. Yakovlev

Keyword(s):

Surface Wind ◽

Sea Surface ◽

Sea Surface Wind ◽

Radiometric Data

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Image Adaptive Thresholding for Multiphase Wavy Flow

Volume 1D, Symposia: Transport Phenomena in Mixing; Turbulent Flows; Urban Fluid Mechanics; Fluid Dynamic Behavior of Complex Particles; Analysis of Elementary Processes in Dispersed Multiphase Flows; Multiphase Flow With Heat/Mass Transfer in Process Technology; Fluid Mechanics of Aircraft and Rocket Emissions and Their Environmental Impacts; High Performance CFD Computation; Performance of Multiphase Flow Systems; Wind Energy; Uncertainty Quantification in Flow Measurements and Simulations ◽

10.1115/fedsm2014-22263 ◽

2014 ◽

Author(s):

Mustafa Al-Nasser ◽

Moustafa Elshafei ◽

Abdelsalam Al-Sarkhi

Keyword(s):

Multiphase Flow ◽

Flow Analysis ◽

Threshold Value ◽

Adaptive Thresholding ◽

Correct Identification ◽

Wave Shape ◽

Uniform Illumination ◽

Gas Phases ◽

A Minor

Multiphase flow measurement is a very challenging issue in process industry. One of the promising approaches for multiphase flow analysis is image processing. Image segmentation is very important step in multiphase flow analysis. Determination of appropriate threshold value is very critical step for correct identification of the liquid and gas phases. There are two main thresholding techniques: Global and Adaptive. Adaptive thresholding is more suitable for multiphase flow case due to it’s adaptability to image conditions such non-uniform illumination and noise. In this work, six adaptive thresholding techniques are examined for the case of wavy flow regime. These algorithms are used to estimate the wave shape and mix region between liquid and gas. In general, the adaptive algorithms are able to compensate for non-uniform illumination and they are able to estimate wave shape and mix region correctly. The execution time for the adaptive techniques is higher than global thresholding technique, but with the availability of new powerful PCs, it will become a minor issue.

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