development of the governing equation on the behavior of radial flows in coarse porous media and its numerical solution

The hydrous bed of the rivers covered with coarse alluvial materials is a goodresource along with other resources to provide the needs of the water. therefore,studying and investigating the flow behavior around wells excavated in these bedsand determining their discharge capacity is very important. since the flow to thewells is radial and previous research on coarse, porous media, there has beenmainly for parallel flows, and yet any equation replacing the laplace relationship incoarse, porous media, is not provided for nondarcy radial flows with a free surface,therefore, the extraction of the differential equation ruling on these types of flowsin the cylindrical coordinates and a method for numerical solution of them in thisresearch has been followed. based on the research carried out in this research, thepower (exponential) equation as the most suitable basic relation for the analysis ofradial flows was determined and used. also, in order to solve the governingequations a numerical model was developed using finite volume method. thedeveloped numerical model act well for the analysis of radial flows in the coarsealluvial beds. the results of the implementation of the numerical model indicate thatthe pressure distribution can be considered hydrostatic.