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Guide wave is gradually used in non-destructive inspection of submarine pipe in recent years. Interface wave is a type of guide waves. Interface wave has some good characteristics, such as high energy and large displacement at interface. Compared with traditional Lamb wave method, interface wave in pipe structure has less modes in high frequency. Thus, interface wave is more easily analyzed than Lamb...
In this study, performance verification of Resource spread FMT-OFDM system and FMT-OFDM system is carried out through a simulation in the underwater channel environment. The measurement was performed in the shallow water of Geojedo located in Namhae-gun, for the real sea channel modeling. We also analyzed the channel delay profile in different underwater channel environments by distance between transmitter...
Multifunctional hybrid glider(MHG) is a new type of platform for ocean observation, integrating the concept of underwater glider and wave glider. The implementation scheme of its motion mechanism is proposed in this paper, and with the rubber webbed wings introduced and the structure redesigned, this vehicle can glide on the ocean surface and in the vertical profile. This can overcome the shortcomings...
The phased array HF ocean radar installed at the Port of Rotterdam gives good quality near real-time information on surface currents for port management. This paper examines the potential to infer current profiles from HF radar and wind station data using prior knowledge of the site. It is shown that tidal currents follow a logarithmic boundary layer profile, and the wind-driven currents have an approximately...
In the modern era of technology Free Space Optics (FSO) communication is a propitious technique for communication among islands or terminals over sea. However, when the beams of laser strikes through the atmosphere, the wavefront of that laser beam opposed by stern influences triggered by the atmospheric turbulence. In this paper, we reassembled the wavefront aberration with Zernike polynomials and...
This paper addresses principles of the attenuation of transient pore pressure, changes of effective stresses, and stress paths along the depth of saturated isotropic seabed subjected to four typical kinds of waves including linear waves, stokes waves, random waves and standing waves. Dynamic behaviors of saturated seabed soils with emphasis on the mechanisms of wave-soil interaction are investigated...
Ocean currents are one of the most important factors in marine environment. Ocean currents affect the availability of nutrients, food and the spread of eggs and larvae for marine animals. Besides, the ocean currents are also the main driven forces for sediment transport and coastal processes which are the key factors for the coastal erosion and accretion as well as marine pollution. Thus, analyzing...
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