Underwater rubble mound leveling works usually have been carried out as a preliminary process prior toudthe installation of caissons and blocks onto the seabed in a harbor and wave energy structures. So far, underwaterudconstruction works are mostly depended on divers. These divers are confronted with many difficulties, such as workingudtime limitation due to depth, poor visibility in a working field and so on. These problems can be overcome usingudmachineries in the underwater construction. The practical unmanned underwater equipment for port constructions wasudnewly developed. The equipment can be applicable in underwater leveling works of rubble mound by using its bladeudand bucket with automatic arms. Also, it can monitor the working environment using sonars and optical devices. Theudsafety analysis considering harsh circumstances such as strong currents is necessary because the equipment is usuallyudmobilized on the seabed. In this paper, the effect of tidal current forces on the behavior of the equipment wasudinvestigated by using the Computational Fluid Dynamics (CFD), which is mainly used in investigating the relativeudmovements of fluid and structure. The numerical results reveal that the possibility of overturning and sliding of theudequipment can be negligible and the structural stability can be assured under a given current velocity of 1m/s.
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