Investigating shallow water bottom feature using SAR data along Gulf of Khambhat, India

2021 ◽  
pp. 100592
Author(s):  
Preeti Rajput ◽  
Ratheesh Ramakrishnan ◽  
Shincy Francis ◽  
A.V. Thomaskutty ◽  
Ritesh Agrawal ◽  
...  
Keyword(s):  
Shallow Water ◽  
Sar Data ◽  
Water Bottom

scholarly journals Wave Equation Datuming Applied to Seismic Data in Shallow Water Environment and Post-Critical Water Bottom Reflection

Energies ◽  
2017 ◽  
Vol 10 (9) ◽  
pp. 1414 ◽  
Author(s):  
Umberta Tinivella ◽  
Michela Giustiniani ◽  
Ivan Vargas-Cordero
Keyword(s):  
Wave Equation ◽  
Shallow Water ◽  
Seismic Data ◽  
Water Environment ◽  
Shallow Water Environment ◽  
Water Bottom

scholarly journals Airborne Hyperspectral Imaging for Submerged Archaeological Mapping in Shallow Water Environments

2019 ◽  
Vol 11 (19) ◽  
pp. 2237 ◽  
Author(s):  
Alexandre Guyot ◽  
Marc Lennon ◽  
Nicolas Thomas ◽  
Simon Gueguen ◽  
Tristan Petit ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Shallow Water ◽  
Water Column ◽  
Sea Level ◽  
Hyperspectral Imagery ◽  
Airborne Lidar ◽  
Radiative Transfer Model ◽  
Invasive Technique ◽  
Transfer Model ◽  
Water Bottom

Nearshore areas around the world contain a wide variety of archeological structures, including prehistoric remains submerged by sea level rise during the Holocene glacial retreat. While natural processes, such as erosion, rising sea level, and exceptional climatic events have always threatened the integrity of this submerged cultural heritage, the importance of protecting them is becoming increasingly critical with the expanding effects of global climate change and human activities. Aerial archaeology, as a non-invasive technique, contributes greatly to documentation of archaeological remains. In an underwater context, the difficulty of crossing the water column to reach the bottom and its potential archaeological information usually requires active remote-sensing technologies such as airborne LiDAR bathymetry or ship-borne acoustic soundings. More recently, airborne hyperspectral passive sensors have shown potential for accessing water-bottom information in shallow water environments. While hyperspectral imagery has been assessed in terrestrial continental archaeological contexts, this study brings new perspectives for documenting submerged archaeological structures using airborne hyperspectral remote sensing. Airborne hyperspectral data were recorded in the Visible Near Infra-Red (VNIR) spectral range (400–1000 nm) over the submerged megalithic site of Er Lannic (Morbihan, France). The method used to process these data included (i) visualization of submerged anomalous features using a minimum noise fraction transform, (ii) automatic detection of these features using Isolation Forest and the Reed–Xiaoli detector and (iii) morphological and spectral analysis of archaeological structures from water-depth and water-bottom reflectance derived from the inversion of a radiative transfer model of the water column. The results, compared to archaeological reference data collected from in-situ archaeological surveys, showed for the first time the potential of airborne hyperspectral imagery for archaeological mapping in complex shallow water environments.

Shallow Water Bottom Reverberation under Downward Refraction Conditions

1974 ◽  
Vol 55 (2) ◽  
pp. 419-419
Author(s):  
Bernard F. Cole ◽  
Eugene M. Podeszwa
Keyword(s):  
Shallow Water ◽  
Water Bottom

Environmental Forces on Offshore LNG Terminals: The Complications of Shallow Water

2004 ◽  
Author(s):  
George Z. Forrsitall
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Field Measurements ◽  
Review Of The Literature ◽  
Water Demands ◽  
Local Measurements ◽  
Wave Heights ◽  
Overall Reliability ◽  
Water Depths ◽  
Water Bottom

Construction of large and expensive facilities in relatively shallow water demands that additional effort be paid to the extreme environmental conditions expected there. A review of the literature on waves in shallow water shows that many processes must be considered there which are not important in deep water. Bottom friction under waves depends on the detailed bottom conditions and parameterizing it properly may require calibration to local measurements. The limits on wave heights over the nearly flat bottoms that are common in water depths of 10–30 m are poorly known. Additional laboratory and field measurements appear to be necessary before depth limited waves can be confidently specified. The structures often respond differently to wave from different directions, so directional criteria could be useful. Commonly used methods of specifying directional criteria are un-conservative, but it is possible to adjust them so that the overall reliability of the structure is preserved.

"KERPLUNKING": SURFACE FLUKE-SPLASHES DURING SHALLOW-WATER BOTTOM FORAGING BY BOTTLENOSE DOLPHINS

2000 ◽  
Vol 16 (3) ◽  
pp. 646-653 ◽  
Author(s):  
Richard C. Connor ◽  
Michael R. Heithaus ◽  
Per Berggren ◽  
Jennifer L. Miksis
Keyword(s):  
Shallow Water ◽  
Bottlenose Dolphins ◽  
Water Bottom

Sound velocity in shallow water bodies with gas-saturated water-bottom (ice) interfaces

2004 ◽  
Vol 50 (1) ◽  
pp. 95-99
Author(s):  
N. V. Studenichnik ◽  
V. P. Glotov
Keyword(s):  
Shallow Water ◽  
Sound Velocity ◽  
Water Bodies ◽  
Saturated Water ◽  
Water Bottom
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