The Effect of Wave-Induced Current and Coastal Structure on Sediment Transport at the Zengwen River Mouth

The mechanisms that control estuarine sediment transport are complicated due to the interaction between riverine flows, tidal currents, waves, and wave-driven currents. In past decade, severe seabed erosion shoreline retreat along sandy coast of western Taiwan have raised concerns regarding sustainability coastal structures. this study, ADCPs (Acoustic Doppler Current Profiler) turbidity meters were deployed at mouth Zengwen river obtain time series spatial distribution flow velocities during base flood conditions. A nearshore circulation model, SHORECIRC, has been adapted into a hybrid finite-difference/finite-volume, TVD (Total Variation Diminishing)-type scheme coupled with wave-spectrum model Simulating Waves Nearshore (SWAN). Conventional finite-difference schemes often produce unphysical oscillations when modeling processes abrupt bathymetric changes mouths. contrast, TVD-type finite volume allows for robust treatment discontinuities through shock-capturing mechanism. reproduces water levels, currents observed River reasonably well. simulated residual patterns demonstrate process is dominated by bathymetry wave-induced discharge was kept in reservoirs. offshore causes northern part mouth, onshore accretion ebb shoals around center mouth. morphological evolution displays significant on shallower deltas. location sea bed consistent spot which occurred recent years. Further analysis also discussed identify role structures, example, extension newly constructed groins near