How does beach paticle size affect beach steepness?

Beach particle size significantly influences beach steepness due to the interplay of grain size and sediment stability. Larger particles, such as gravel, typically create steeper beaches because they can resist movement and maintain a more angular slope. In contrast, finer sands tend to produce gentler slopes as they are more easily eroded and shifted by wave action. The overall beach profile thus reflects the balance between particle size, wave energy, and sediment dynamics.