A proposal of marine geophysical exploration techniques for offshore plant installation

Ha, Jiho; Ko, Hwi-Kyung; Cho, Hyen-Suk; Chung, Wookeen; Ahn, Dang; Shin, Sung Ryul

doi:10.5916/jkosme.2013.37.2.242

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…The port has a high volume of cargo traffic and fishing ships and is being actively developed for energy infrastructure. Therefore, numerous survey projects have been conducted to explore the acoustic basement of the research area [21,24,25].…”

Section: Study Areamentioning

confidence: 99%

Integrated Offshore Seismic Survey Using an Unmanned Wave Glider

et al. 2021

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An autonomous surface vehicle, known as a wave glider, was used to record refracted and reflected signals from a seismic source penetrating the shallow subsurface. An integrated survey system consisting of a wave gilder and a human-operated source vessel was deployed. These survey systems are used to acquire wide-offset seismic survey data from specific areas, such as offshore structures. The wave gliders can collect seismic refraction and reflection data, which can be used to estimate subsurface information, e.g., acoustic wave velocity and subsurface structure. We processed raw data collected by a receiver equipped with the wave glider and used the relationship between travel time and offset distance to calculate the velocities of shallow sedimentary deposits and the acoustic basement. The velocities of the sedimentary deposits and basement were estimated to be 1557 and 3507 m/s, respectively. We then overlaid the velocities on subsurface data measured using a single-channel streamer. Our results indicate that unmanned equipment can be used for ocean exploration to aid offshore energy development.

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Section: Study Areamentioning

confidence: 99%

Integrated Offshore Seismic Survey Using an Unmanned Wave Glider

et al. 2021

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“…Among various studies related to marine development, marine exploration is a fundamental physical exploration that is needed for multiple purposes, such as resource and energy development and management, navigation safety, and military operations. Marine exploration is being used directly for engineering purposes such as marine civil engineering and offshore plant installations through the marine development phases, ranging from the initial exploration stage of resource development to the production of equipment, the changes of terrain during the production process [1], but, if the undersea topography or depth of water information is not accurate, it may cause damage such as stranding of ships, damage to underwater optical cables, and damage to offshore structures. Accordingly, marine exploration is necessary and with the development of science and technology along with the necessity, studies of marine exploration using unmanned robot technology in an underwater environment that replaces existing ships or humans, are actively being carried out.…”

Section: Introductionmentioning

confidence: 99%

Dynamics Modeling and Motion Simulation of USV/UUV with Linked Underwater Cable

Hong

Kim

2020

JMSE

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This paper describes a study on the dynamic modeling and the motion simulation of an unmanned ocean platform to overcome the limitations of existing unmanned ocean platforms for ocean exploration. The proposed unmanned ocean vehicle combines an unmanned surface vehicle and unmanned underwater vehicle with an underwater cable. This platform is connected by underwater cable, and the forces generated in each platform can influence each other’s dynamic motion. Therefore, before developing and operating an unmanned ocean platform, it is necessary to derive a dynamic equation and analyze dynamic behavior using it. In this paper, Newton’s second law and lumped-mass method are used to derive the equations of motion of unmanned surface vehicle, unmanned underwater vehicle, and underwater cable. As the underwater cable among the components of the unmanned ocean platform is expected to affect the motion of unmanned surface vehicle and unmanned underwater vehicle, the similarity of modeling is described by comparing with the cable modeling results and the experimental data. Finally, we constructed a dynamic simulator using Matlab and Simulink, and analyzed the dynamic behavior of the unmanned ocean platform through open-loop simulation.

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Velocity Model Building using Waveform Inversion from Single Channel Engineering Seismic Survey

Choi¹,

Shin²,

Ha³

et al. 2014

Geophysics and Geophysical Exploration

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Recently, single channel seismic survey for engineering purpose have been used widely taking advantage of simple processing. However it is very difficult to obtain high fidelity subsurface image by single channel seismic due to insufficient fold coverage. Recently, seismic waveform inversion in multi channel seismic survey is utilized for accurate subsurface imaging even in complex terrains. In this paper, we propose the seismic waveform inversion algorithm for velocity model building using a single channel seismic data. We utilize the Gauss-Newton method and assume that subsurface model is 1-Dimensional. Seismic source estimation technique is used and offset effect is also corrected by removing delay time by offset. Proposed algorithm is verified by applying modified Marmousi2 model, and applied to field data set obtained in port of Busan.

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A proposal of marine geophysical exploration techniques for offshore plant installation

Cited by 3 publications

References 1 publication

Integrated Offshore Seismic Survey Using an Unmanned Wave Glider

Integrated Offshore Seismic Survey Using an Unmanned Wave Glider

Dynamics Modeling and Motion Simulation of USV/UUV with Linked Underwater Cable

Velocity Model Building using Waveform Inversion from Single Channel Engineering Seismic Survey

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