Sensitivity of tides and tidal components to sea-level-rise in the Radial Sand Ridges

Abstract Sea-level-rise (SLR) induced by global climate would by changing tidal dynamics in the deltaic and coastal regimes aggravate inundation risks. In order to have a thorough understanding of the tidal responses to SLR in the RSR of the South Yellow Sea, a comprehensive analysis on the tidal and tidal components’ responses to SLR are conducted. Spatial variations of tides and tidal components between SLR scenarios and present-day scenario are examined. Strong spatial variation in tidal responses to SLR occurs over the RSR. Further investigation reveals it is the semidiurnal tide ( S 2 ) in control of the tidal range evolution under SLR in this area. Strong spatial variability in the primary tidal amplitudes’ evolution is found between northern Dongsha shoal and southern Lansha-yang channel in the RSR. The significantly enhanced shallow water tidal components, M 4 and MS4, lead to increase tidal distortion(flood-dominant) in the nearshore under SLR. In addition, the natural period for tidal resonance in the RSR tends to be smaller and the amplification due to resonance enhances. The evolution in tidal asymmetry and tidal resonance adjusts the timing and height of the local high-water levels. Therefore, conclusion in this study can be used for reference to future high-water level prediction in the RSR.