海岸按其组成物质的不同,可分为岩质海岸、沙质海岸和淤泥质海岸。淤泥质海岸多位于平原河流及大河河口附近,我国很多海岸是淤泥质海岸。这种海岸的基本特征是滩面宽广,坡度平缓、滩面的组成物质很细,且粘性颗粒所占比重很大。从淤泥质海岸波浪运动的动力特性来看,一是波浪在传播过程中的沿程衰减较快,这在我们六十年代进行水槽试验时就发现过。根据美国 According to the composition of the coast of different materials, can be divided into rocky coast, sandy coast and muddy coast. Muddy coasts are mostly located in the plains and the estuaries near the river mouth, many of our coast is muddy coast. The basic characteristics of this coast are wide beach, gentle slope, the composition of the beach is very thin, and a large proportion of sticky particles. In terms of the dynamic characteristics of the wave motion of the silt coast, firstly, the wave attenuation along the course of the wave propagation is rapid, which was discovered when we conducted the tank test in the 1960s. According to the United States