Variation of coastal hydrodynamics, through their sustained impact, facilitate not only the translocation of matter within the ocean's upper strata but also profoundly influence marine sedimentation patterns, and ecological systems. Furthermore, these movements are instrumental in the redistribution of energy across marine spaces, thereby modifying the ocean's energy landscape. This research delineates the dynamic processes in coastal water body including the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) and western coasts of Ireland based on observations from the High Frequency radar system. We focus on studying variation of in surface current patterns space and time. Additionally, the lateral progression of near-inertial oscillations as influenced by tropical cyclones was analyzed as well. Approaching from the perspective of near-inertial surface currents, this investigation delves into the spatial-temporal dynamics and energy characteristics of these currents, particularly under the conditions set by tropical cyclones. In this context, the present analysis utilizes High-Frequency radar (HFR) systems for the acquisition of continuous data on sea surface currents within representative coastal zones. The objective is to uncover the underlying principles governing the lateral development of surface currents in the waters, especially in the presence of tropical cyclones. This exploration into variation of surface currents aims to augment our comprehensive understanding of marine hydrodynamics, thereby contributing substantially to the expansion and intensification of oceanographic dynamical studies.
 

surface currents,high frequency radar,hydrodynamics