Wave-dissipating blocks are crucial to protect coastal areas by dissipating wave energy. The installation of these blocks is traditionally performed by skilled workers based on their experience, making it a challenging task for inexperienced workers. To address this issue, a block installation simulator is developed using Unity 3D, a game development engine. One notable feature of the simulator is its ability to allow users to view the 3D model of the breakwater and the tolerance area. This feature enables users to ensure that the blocks are installed within the designated area of the breakwater, a task that is difficult to achieve on-site. In this paper, we validate whether the display of the trapezoidal prism in the simulator helps improve the accuracy of workers in placing wave-dissipating blocks. Two professionals in the field were tasked with placing all the required blocks within the breakwaters with three scenarios. The results were evaluated based on the porosity of the placements, the number of protruding blocks, and the time consumed to complete the task.

In the present work, we shall investigate the Lyapunov spectrum as well as synchronization phenomena of the time-delayed chaos system with nonlinear Tent mapping to involve a chaotic dynamics. In practice we shall examine chaotic property in such a time-delayed chaos model in terms of the Lyapunov spectrum analyses through the Gram-Schmidt scheme. Then one shall examine the relation between the chaotic behavior and the characteristic solutions in terms of the Lambert function. In addition it will be confirmed that there exists a synchronization regime with respect to a coupling parameter for such a coupled time-delayed chaos system on the basis of the Lyapunov spectrum and the characteristic exponent solutions. According to our computer simulations, it will be also found that the synchronization phenomena in the coupled chaos system may be involved not only in chaotic states but also in non-chaotic states depending on both the delay-time and the coupling parameters. As future works, such a time-delayed chaos system with the multi-delay time parameters and/or with other nonlinear mapping functions such as Chebysheff function recently investigated are considered to be worthwhile from the view point of attractive applications to the secure-communications.