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					             Article information  
            2025 ,  Volume 30, Ή 2, p.38-53
 Skiba V.S., Khakimzyanov G.S.
Force impact of long surface waves on a body semi-immersed in water. II. Influence of the mooring wall
Purpose. When coastal structures are located in close proximity to each other, abnormally high  free surface elevations can occur in the gap between them, which can lead to an extreme increase in  the wave forces acting on them. This problem is called the Gap Resonance Problem and almost all  previous studies have considered the case of short periodic waves. The purpose of this paper was to  consider the case of long incident waves.   Methods. In the present work we employ previously developed numerical algorithm based on  a mathematical model of two-dimensional potential flows of an ideal fluid with a free boundary.   Results. We determine the dependencies of the maximum runup and wave force on the amplitude  and length of the incoming single wave, length and draught of the semi-immersed body and the  distance between the body and the vertical impermeable wall. The parameter values that lead to  the extremely large values of runup and wave forces are found.   Conclusions. The gap resonance phenomenon can also occur for long incident waves. The runup  on the back edge decreases as the gap between the body and the wall widens, the same as in the  case of short periodic waves. The runup on the back edge of a body always exceeds the runup on  the front edge, while the opposite is true for a body located far away from the wall. The maximum  horizontal force acting on a vertical wall is mostly dependent on the amplitude of the incoming  wave and is practically independent of the length of the body and its depth. When the gap width  is greater than the resonance width, the maximums of the runup at the rear and front edges of  the body, the load on the vertical wall and the vertical component of the wave force monotonically  decrease as the distance from the mooring wall increases.
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  Keywords: gap resonance problem, single wave, partially immersed structure, wave force, potential flow model, calculation results
  doi: 10.25743/ICT.2025.30.2.004
 Author(s): Skiba Vasiliy Savelevich Position: Junior Research Scientist Office: Federal Research Center for Information and Computational Technologies, Novosibirsk State University Address: 630090, Russia, Novosibirsk, 2, Pirogova Str. 
SPIN-code: 3262-5300Khakimzyanov Gayaz Salimovich Dr. , Professor Position: Leading research officer Office: Federal Research Center for Information and Computational Technologies Address: 630090, Russia, Novosibirsk, Ac. Lavrentiev ave. 6 
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