Results 241 to 250 of about 856,677 (287)

Influence of bottom depths and bottom types on water surface reflectance

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2018, 2018
Two flow irradiance model solutions are tested using various bottom depths and hyperspectral in-situ bottom reflectance signatures for Elkhorn Coral, Bleached Reef, Sand, Sand and Seagrass, and Turtle Grass. Bottom reflectance signatures are used to simulate a water surface reflectance signatures from analytical solutions that can account for the ...
Tyler Rotkiske, Charles R. Bostater
openaire   +1 more source

Acoustic inversion of bottom reflectivity and bottom sound-speed profile in shallow water.

The Journal of the Acoustical Society of America, 1996
This paper presents a full field technique to invert bottom sound profile and bottom reflectivity from acoustic data collected in shallow water. Bottom sound-speed profile and bottom reflectivity have been traditionally estimated using seismic reflection/refraction when acoustic ray paths and travel time can be identified and measured from the data ...
T.C. Yang, T. Yates
openaire   +1 more source

Comments on reflecting bottom solar ponds

Energy Conversion and Management, 1985
Etude critique d'un modele thermique presente dans une publication anterieure de bassin solaire a 3 zones a fond a reflexion ...
M.S. Sharma, S.K. Rao, N.D. Kaushika
openaire   +1 more source

Estimation of in-situ bottom-reflectance spectra

SPIE Proceedings, 1990
Estimators of in situ bottom reflectivity are compared to laboratory measured spectra for several sites. Statistics are compiled on the relative fits of the estimators spectral curves to the laboratory data. A best estimator is selected based on these statistics.
Leland Estep, Jon Kaufman, Ned H. Witherspoon, John H. Holloway, Jr.   +3 more
openaire   +1 more source

Signal Distortion Caused by Bottom Reflection

The Journal of the Acoustical Society of America, 1966
The acoustic theory for the reflection of a single-frequency plane wave from a fluid layer lying between two semiinfinite fluid media, where the layer and the bottom medium are subject to attenuation, is reviewed. Applying the experimental fact that the attenuation is proportional to the first power of frequency to this theoretical model, it is shown ...
Albert H. Nuttall, Benjamin F. Cron
openaire   +1 more source

Wave Dissipation and Reflection on Muddy Bottoms

Coastal Structures 2003, 2004
This paper presents a new method to separate damped incident and reflected waves propagating over a muddy bottom and to estimate associated dissipation ratios from simultaneous recordings of wave profiles. On the basis of the resolution results, the reflection coefficient of the structure is estimated.
D.-X. Shen, Christopher M. Carr, M. Isobe   +2 more
openaire   +1 more source

Theoretical reflectivity and simulation of reflection from the ocean bottom

The Journal of the Acoustical Society of America, 1978
The boundary value problem to be solved in computing the reflectivity of a solid, viscoelastic, ocean bottom can be formulated as a matrix differential equation with variable coefficients. In the Thomson-Haskell techniques a solution is found by assuming the coefficients (elastic parameters) are constant over a certain depth range (a layer).
openaire   +1 more source

Normal-incidence bottom and sub-bottom reflection in the Canada basin of the Arctic Ocean

The Journal of the Acoustical Society of America
The normal-incidence reflection coefficient of a patch of seabed in the Arctic Ocean was analyzed using the signal from a source colocated with a vertical line array. A mooring in the Canada Basin of the Arctic Ocean in approximately 4000 m water depth, contained a sound source 54.7 m below the water surface and a vertical receiving array below it. The
Nicholas P. Chotiros, Matthew Dzieciuch
openaire   +2 more sources

A Perspective on Bottom Reflectivity and Backscattering

1980
A review of available data and description of observed effects permit an assessment of progress made since the 1970 SACLANT Conference on this same topic. Physical models have been developed and refined which can both explain the observations and serve as a basis for predictions.
openaire   +1 more source

Effects of bottom reflectivity on volume (fish) and bottom backscattering in shallow water

Proceedings of OCEANS'94, 2002
Reverberation measurements in shallow water made with fixed source and receiver arrays (D. Weston, 1971) demonstrated that scattering from bladder-bearing fish can dominate backscatter from long ranges in shallow water environments at frequencies of 1 and 2 kHz. In this work, estimates of monostatic scattering levels due to both bottom and volume (fish)
O. Diachok, J.R. Preston
openaire   +1 more source