Method for particle size analysis of bed material sediment and related device

A device for particle size analysis of bed material sediment, comprising:

• a light intensity obtaining module configured to obtain an intensity of light through a preset plane at each of a plurality of moments during a settling process of a bed material sediment sample, wherein the preset plane is any horizontal plane other than a highest horizontal plane and a lowest horizontal plane in a sample container holding an evenly mixed bed material sediment suspension;
• the evenly mixed bed material sediment suspension is obtained by evenly mixing the bed material sediment sample and distilled water or by evenly mixing the bed material sediment sample and salt-free water;
• and bed material sediment with different particle sizes in the bed material sediment sample settles to the preset plane at different settling rates;
• a percent calculation module configured to, for any one of the particle sizes, calculate a percentage by weight of sediment finer than the any one of the particle sizes based on the intensity of light through the preset plane at each of the plurality of moments, wherein the percentage by weight of sediment finer than the any one of the particle sizes is a ratio of a sediment concentration of particle sizes smaller than the any one of the particle sizes to a total sediment concentration;
• and
• a particle size analysis module configured to obtain a particle size distribution and a particle size distribution curve based on the any one of the particle sizes and the percentage by weight of sediment finer than the any one of the particle sizes.