Numerical Study of Coastal Erosion Based on Sea Level Rise

In the propagation of wave near the shore, the water depth becomes shallower and the nonlinear effect becomes more intense. An extended version of XBeach model is presented to improve the accuracy of coastal profile evolution under nonlinear wave, and the improved model is verified by the classical wave flume experiment. The results show that the improved model can more accurately simulate the change of coastal erosion and deposition under wave action and can be used in the numerical simulation of coastal profile evolution. Based on wave flume experiment, several groups of simulated water depth were added to simulate sea level rise and explore the relationship between sea level change and coastal profile evolution. The results show that the higher the sea level is, the more serious the coastal erosion is and the larger the shoreline recession is. The trend of shoreline recession calculated by the numerical model is consistent with that predicted by Bruun Rule, which indicates that the numerical model can effectively predict the change of coastal erosion caused by sea level rise.