Wave impact pressure propagation in porous coastal structures

研究的目的是系统地描述水波冲击压力在多孔海岸结构物中的时空传播，即压力波在多孔介质中的传播速度和高度作为主要影响参数的函数。要回答的研究问题如下：1)多孔介质的性质，如孔隙率、渗透率和多孔介质各元素的形状对压力波的传播有什么影响？2)多孔介质中的水的空气含量对冲击压力的传播有什么影响？3)覆盖多孔介质的水层对介质上边界处的冲击压力有什么影响？4)多孔介质的边界有什么影响，这些边界可以是不渗透的边界，也可以是多孔介质，从而对这一过程有了更好的理解，并首次建立了多孔介质水波冲击载荷的通用模型。文中还给出了作为多孔海岸结构边界条件的波浪冲击压力的高度和时间参数(上升时间和持续时间)的统计描述。通过描述多孔介质中各个元素的压力，还可以得出导致沿海多孔结构破坏的机制的结论。

The aim of the investigations, which will be carried out on a surrogate model, is to systematically describe the spatial and temporal propagation of the water wave impact pressure in porous coastal structures, i.e. the propagation velocity and height of the pressure wave propagating through the porous medium as a function of the main influencing parameters. The following research questions are to be answered:1) What influence do the properties of the porous medium such as porosity, permeability and the shape of the individual elements of the porous medium have on the propagation of the pressure wave?2) What influence does the air content of the water in the porous medium have on the propagation of the impact pressure?3) What is the influence of a water layer covering the porous medium on the impact pressure at the upper boundary of the medium?4) What influence do the boundaries of the porous medium, which can either be impermeable boundaries or in turn can consist of porous media, have on the reflection of the impact pressure wave at these boundaries?Thus, a better understanding of the process is achieved and, for the first time, a generic model for the water wave impact load of porous media is established. A statistical description of the height as well as the temporal parameters (rise time and duration) of the wave impact pressure as a boundary condition of porous coastal structures will be given as well. By describing the pressures at individual elements of the porous medium, it will also be possible to draw conclusions about mechanisms that lead to damage in porous coastal structures.