Simplified analysis for estimation of the behavior of a submerged floating tunnel in waves and experimental verification

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Simplified analysis for estimation of the behavior of a submerged floating tunnel in waves and experimental verification
Sung-il Seo a, *, Hyung-suk Mun a, 1, Jin-ho Lee a, 2,
Jin-ha Kim b, 3
a New Transportation System Research Center, Korea Railroad Research Institute, 176, Cheoldo
bangmulgwan-ro, Uiwang-City, Gyeonggi-Do, 16105, South Korea
b Offshore Plant Research Division, KRISO [Korea Research Institute of Ships & Ocean Engineering],
171 Jangdong, Yusong, Daejeon, 305-343, South Korea
a r t i c l e i n f o
Article history:
Received 3 December 2014
Received in revised form 2 September 2015
Accepted 3 September 2015
Available online xxx
Keywords:
Inertia force
Morison's equation
Physical model
Linear wave theory
Wave load
Drag force
Submerged floating tunnel
a b s t r a c t
To achieve rational design in waves for a submerged floating
tunnel which has emerged as a new offshore transportation
infrastructure, it's necessary to understand its hydrodynamic
behavior. For simple but accurate estimation of hydrodynamic
forces, a theoretical method is proposed and the tests with physical
models in a wave flume were carried out for verification.
Morison's equation was used to estimate wave loads composed of
inertia force and drag force. Forces calculated by applying the
linear wave theory to Morison's equation coincided well with
those measured by the tests. The test results showed that mooring
systems played a significant role in the movement of the submerged
floating tunnel in waves. A pendulum model could be used
to describe the motion of the submerged floating tunnel with a
single vertical mooring. Based on the verified relations, a simple
slack condition which causes the submerged floating tunnel to be
unstable was also proposed. The simplified approach proposed by

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