###### Abstract
[14] employed a test to examine the determinant of the near-fault seismic motion on the columns and piers of a bridge. The findings indicated that the near-fault ground motion accumulated the strain, curvature, and drift ratio of the bridge. [PERSON] et al. [15] examined the risk of using simply supported beam bridges under pulse earthquakes. It was established that the directional pulse effect poses a greater risk of damage to the bridge structure. [PERSON] et al. [16] employed both a test and numerical simulation to examine the seismic behavior of high-pier bridges under pulse ground motion action. Their findings indicated that the characteristics of pulse ground motion have an evidential consequence on the seismic presentation of high-pier bridges. [PERSON] et al. [17] investigated the dynamic behavior of cable-stayed bridges under pulse seismic excitation. The accuracy of their finite element model was confirmed through experimental validation. The study determined that near-fault pulse ground motion would result in an increase in the peak values of the bridge's dynamic behaviors and an increase in the requirement for damping force. [PERSON] et al. [18] designed a tall-pier continuous rigid-frame bridge scale test model, and employed the test to examine the determinant of pulse parameters on the seismic behavior of the model bridge. [PERSON] et al. [19] using the ANSYS software platform to form a bridge finite element model, and studied the influence of pulsation effect characteristics on the consequence of sea-crossing bridges. [PERSON] et al. [20] carried out multi-directional pulse seismic motion on cable-stayed bridges, and found that pulse ground motion is more sensitive to the direction of the ground motion than non-pulse ground motion, while the seismic force generated is more apparent. [PERSON] et al. [21] adapted near-fault pulse ground motion to examine the influence of a three-dimensional input on the non-linear time history and the seismic wreck and crack evolution of the girder. The hydrodynamic behavior of a bridge pier under pulse ground motion has yet to be investigated in water environments. This study utilized the ground motion signal processing software EOSignal [22; 23; 24] to synthesize three non-pulse seismic motions and pulse seismic motions with varying characteristic periods (Tg = 0.45 s; Tg = 0.40 s; Tg = 0.30 s). The dynamic behavior of a bridge pier was investigated under two varying water levels (0 m and 10 m) and studied using non-pulse seismic waves and pulse seismic waves. It was indicated that water had a striking effect on the acceleration and stress behavior of the bridge pier. The outcome of the pulse seismic motion on the acceleration and stress of the bridge pier was more pronounced than that of non-pulse seismic waves. Furthermore,the influence of the pulse seismic motion on the dynamic behavior of the bridge pier was highly complex. The water influenced the action law of pulse seismic motion but the overall dynamic behavior of pulse seismic motion was considerably more significant than the hydrodynamic effects associated with the water itself. In this paper, the velocity-type pulse seismic motion, different characteristic periods, the joint effect of the bridge pier and water, and the mechanism of interaction between the pulse effect and hydrodynamic effect are discussed in depth. The result is a compounded effect used to optimize the earthquake design of bridges and improve the earthquake disaster prevention ability.