Sediment size distribution refers to the range and proportions of different particle sizes found in a sediment sample. It is important in fields like geology, environmental science, and engineering, as it influences processes such as erosion, sediment transport, and habitat formation. Sediments can be classified into categories like clay, silt, sand, and gravel based on their size. Understanding sediment size distribution helps scientists and engineers predict how sediments will behave in natural and artificial environments. For example, finer sediments, like clay, tend to settle slowly in water, while coarser sediments, like gravel, settle quickly. This knowledge is crucial for managing rivers, lakes, and coastal areas.