title: Equilibrium bed-concentration of nonuniform sediment.
abstract: Knowledge of the equilibrium bed-concentration is vital to mathematical modeling of the river-bed deformation associated with suspended load but previous investigations only dealt with the reference concentration of uniform sediment because of difficulties in observation of the bed-concentration. This work is a first attempt to develop a theoretical formula for the equilibrium bed-concentration of any fraction of nonuniform sediment defined at the bed-surface. The formula is based on a stochastic-mechanistic model for the exchange of nonuniform sediment near the bed, and described as a function of incipient motion probability, non-ceasing probability, pick-up probability, and the ratio of the average single-step continuous motion time to static time. Comparison of bed-concentration calculated from the proposed formula with the measured data showed satisfactory agreement, indicating the present formula can be used for solving the differential equation governing the motion of suspended load.
authors.affiliation: Department of Hydraulic & Ocean Engineering, Zhejiang University, Hangzhou 310028, China. szl@mail.hz.zj.cn
authors.forename: Zhi-Lin
authors.initials: ZL
authors.lastname: Sun
authors.forename: Zhi-Feng
authors.initials: ZF
authors.lastname: Sun
authors.forename: John
authors.initials: J
authors.lastname: Donahue
mesh_terms: D000327:Adsorption; D003198:Computer Simulation; D004058:Diffusion; D019015:Geologic Sediments; D015233:Models, Statistical; D009038:Motion; D010316:Particle Size; D012212:Rheology / Q000379:methods*; D013269:Stochastic Processes; D013314:Stress, Mechanical; D013535:Suspensions; D014867:Water; D014872:Water Movements
chemical_list: D013535:Suspensions; D014867:Water