Brunhes The (Bruun) rule is the earliest method for predicting coastal erosion caused by sea level rise, and the simplest method. According to the situation of China's sandy and silty coast, the law of grace can qualitatively explain the relationship between sea level rise and coastal erosion. It is possible to use it to predict coastal erosion and developmental periods that meet its requirements. However, if the coastal environment and conditions are not strictly examined, it is expected to be more common as a general pattern for predicting coastal erosion in sea level rise. Research proves.