## 3 Results and Discussion
### Overall Interpretations of the Results of Baseline Case
This indicates that as H\({}_{\rm w}\) increases, the water level inside the slope also rises due to infiltration, which in turn causes the pore pressure to increase. Conversely, when H\({}_{\rm w}\) decreases, the pore pressure also declines. The piezometers installed at different locations show that the ones closer to the slope surface PP1 are primarily influenced by changes in wave height, while those farther from the slope surface PP2-4 are mainly affected by changes in the water level after infiltration. By observing the pore pressure PP1, which is closest to the slope face, and the variation in H\({}_{\rm w}\) from t\({}_{3}\) to t\({}_{6}\), we found similar trends, as indicated by the blue arrows in Figure 6b,f. It can be deduced that the changes in wave height no longer directly affect the pore pressure at PP1. Instead, H\({}_{\rm w}\) influenced the pore pressure of PP1 more significantly. This shift is likely because wave erosion caused the slope to deform progressively during t\({}_{0}\) to t\({}_{3}\) (as shown in Figure 7), leading to the dissipation of wave energy. Therefore, as H\({}_{\rm w}\) decreases, the water level above the piezometer PP1 also decreases, thereby decreasing the pore pressure of PP1. In essence, the results demonstrate how the severity of wave erosion at different stages affects slope stability, highlighting the critical role of wave characteristics in the slope erosion process. Important points can be summarized as follows:  
1. Water height variations: The water height is stable in Stages 1 and 2, but there are significant variations in Stage 3 due to slope profile changes affecting wave reflection. 2. Seismic signals: The amplitude of seismic signals increases with wave height, and accelerometers closer to the slope will record higher readings. 3. Acoustic signals: The acoustic signals are \"quieter\" in Stages 1 and 2 and are \"louder\" with more variations in Stage 3 due to increased wave breaking and splashing. Figure 7: Profile change in the slope model during Stage 3 (Note: PP3 was installed in the slope model and is 0.5 m on the right side of PP2, but it cannot be labeled, as it is outside of the photo). * Pore pressures: The pore pressures in the slope are stable in the early stages and have significant changes in Stage 3. Pore pressure changes reflect variations in wave height and H\({}_{\rm w}\), with higher readings when the piezometer is near the eroded slope face. Higher wave height and H\({}_{\rm w}\) raise the water level inside the slope, increasing pore pressure. * Geometry changes in slope: A change in the slope's geometry due to wave erosion affects wave energy dissipation, influencing water levels above the piezometers and altering pore pressure. From the above discussions, the trends between changes in pore pressure and changes in wave height and H\({}_{\rm w}\) are similar. The proximity of piezometers to the eroded slope affected the amplitude of pore pressure readings. As the wave height and H\({}_{\rm w}\) increased, so did the water level inside the slope, influencing the pore pressure. The geometry changes in the slope due to wave erosion also affected the dissipation of wave energy, thereby influencing the water level above the piezometers and consequently altering the pore pressure.