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Open AccessArticle

Experimental Study on 2D Motion Characteristics of Submerged Floating Tunnel in Waves

1
National Engineering Laboratory of Port Hydraulic Construction Technology, Tianjin Research Institute of Water Transport Engineering, Tianjin 300456, China
2
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China
3
College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(2), 123; https://doi.org/10.3390/jmse8020123
Received: 29 January 2020 / Accepted: 12 February 2020 / Published: 15 February 2020
(This article belongs to the Section Ocean Engineering)
Submerged floating tunnel (SFT) is a new type of transportation infrastructure for crossing sea straits in relatively deeper water. Compared with the fixed tunnel, the main challenge in designing a SFT is the stability maintaining in a complex hydrodynamic environment, especially for the wave-induced dynamic load. In this study, a series of systematic experiments were conducted to investigate the 2D motion characteristics (i.e., heave, sway and roll) of the SFT exposed to regular waves. The movement of the SFT model is measured by the image processing method which is a noncontact measurement. The experimental observation of SFT motion during the process of wave and SFT interaction is described in detail, and the influence of several governing parameters is thoroughly analyzed, including the wave height and period, submergence depth, buoyancy to weight ratio (BWR), and the mooring line angle. The results show that the motion amplitudes of SFT increase with the wave height increasing. The effect of wave period is related to the natural period of the structure. The sway, heave and roll of the SFT submerged beneath the water surface are much smaller than that of the SFT on the water surface. With the increase of BWR, the motion of SFT decreases. The motion amplitude increases with mooring line angle increasing. Finally, empirical equations are proposed to estimate the motion characteristics of the SFT. View Full-Text
Keywords: submerged floating tunnel; motion characteristics; 2D experiment; regular wave; submergence depth submerged floating tunnel; motion characteristics; 2D experiment; regular wave; submergence depth
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MDPI and ACS Style

Yang, Z.; Li, J.; Zhang, H.; Yuan, C.; Yang, H. Experimental Study on 2D Motion Characteristics of Submerged Floating Tunnel in Waves. J. Mar. Sci. Eng. 2020, 8, 123.

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