An Approach to the Calculation Method of Mean Sediment Size

by Yingyan Chen, Chinese Acad of Sciences, Sichuan, China,
Huilin Zhao, Chinese Acad of Sciences, Sichuan, China,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: Mean sediment size is an important parameter expressing the characteristics of sediment. Several calculation methods of mean sediment size which are popular at present almost have some inadequacies. For improving calculation method we propose a new way. The mean size Dvs with this way is defined as follows: We suppose a kind of particles with the same size Dvs represents all grains of a sediment sample, the total volume and total surface area of this kind of particles are as many as the ones of all grains of this sample, then the size Dvs is named the equal volume and surface size of the sample. This method has these advantages: expressing the weight and surface action of grains; reflecting the different effects of fine and coarse particle; having clear physical concept; calculating easy. In this paper we give some examples adopting this method. In these instants we could better explain various debris flow phenomena and obtain more satisfactory results than applying other methods. We believe this method not only can be applied in debris flow, but also would be used in other fields, such as civil engineering, tube material transport, geograph and geology, etc.

Subject Headings: Particle size distribution | Grain (material) | Sediment transport | Overland flow | Debris | Solids flow

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