Sound attenuation coefficients in sandy and silty seabottoms from low‐ to mid‐frequency field measurements in shallow water.

2008 ◽  
Vol 124 (4) ◽  
pp. 2467-2467
Author(s):  
Ji‐Xun Zhou ◽  
Xue‐Zhen Zhang ◽  
Nicholas P. Chotiros
Keyword(s):  
Shallow Water ◽  
Field Measurements ◽  
Sound Attenuation ◽  
Attenuation Coefficients ◽  
Frequency Field

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.

scholarly journals APPLICATION OF VIDEO IMAGES FOR MONITORING COASTAL ZONE IN HASAKI BEACH, JAPAN

2012 ◽  
Vol 1 (33) ◽  
pp. 43
Author(s):  
Muhammad Zikra ◽  
Noriaki Hashimoto ◽  
Masaru Yamashiro ◽  
Masaki Yokota ◽  
Kojiro Suzuki
Keyword(s):  
Shallow Water ◽  
Coastal Zone ◽  
Image Data ◽  
Field Measurements ◽  
Video Camera ◽  
Video Image ◽  
Wave Spectra ◽  
Digital Video Camera ◽  
Directional Wave ◽  
Pixel Brightness

The video image analysis methods are used for monitoring the phenomena at the coastal zone. A digital video camera which is mounted in the HORS research building is used to estimate directional wave spectra and bathymetry in shallow water areas. The Bayesian Directional Method is used to estimate directional wave spectra using the group of pixels brightness and non-linear bathymetry inversion is used to estimate shallow water bathymetry using time series of pixel brightness intensity at cross-shore and longshore array. The results are compared with a numerical model and field measurements. The results indicate that video image data could be used to estimate bathymetry and directional wave spectra in shallow water areas.

Two‐dimensional acoustic field measurements in a complex, shallow‐water waveguide

1997 ◽  
Vol 102 (5) ◽  
pp. 3143-3143
Author(s):  
Laurence N. Connor ◽  
George V. Frisk ◽  
Kyle M. Becker ◽  
Cynthia J. Sellers
Keyword(s):  
Shallow Water ◽  
Acoustic Field ◽  
Field Measurements ◽  
Two Dimensional
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