experimental investigation of delta progression in reservoir

in this research, using an expansive channel in plan and along the longitudinal profile, deltaic reservoir sedimentation was studied. sedimentation in bed load governed conditions and delta formation in reservoir environment is a function of various parameters such as: geometrical shape of reservoir, bottom slope, hydrological properties and hydraulic conditions of inflowing stream, sediment load and type of sediment. in this current work, some of effective variables including: depth of reservoir, water discharge, rate of sediment load, physical and geometrical characteristics of grains was studied. the rate of bed level changes and delta movements in time, corresponding to variation of each parameter, was recorded. observations shows, rate of delta movements along the reservoir have a high dependency on pool water level. by use of dimensional analysis, some dimensionless parameters proportional to physical properties of phenomenon have been derived. the governing rule of phenomenon was established in accordance with experimental results and non-dimensional variables. finally the curves of delta movements and the characteristic parameter of reservoir were presented as new achievements of this project.