مدل عددي يك بعدي براي شبيه سازي رسوبگذاري رسوبات چسبنده ريزدانه در مجاري روباز

A f-D numerical model for simulation of fine - grain cohesive sediment deposition in open channels

A detailed description of the behavior of cohesive fine-grained sediments is a very complicated task. Simulation of cohesive sediment movement has been successfully treated in the past using the macroscopic properties of the water-sediment system. In this study, a 1-Dimensional equation of cohesive sediment has been proposed for deposition term of mass transfer equation. This equation has been solved by Control Volume method and calibrated with laboratory data. The tests have been done in a flume with 0.3m diameter, the slope 0.00008, dischange between 6.12 liter per second and the concentration of 4-7 gram per liter. The model shows that the deposition is a function of flow concentration, flow depth and rate of bottom shear stress to threshold shear stress of deposition.