COMPARISON OF DIFFERENT CONFIGURATIONS OF RANNEY WELLS USING FINITE ELEMENT MODELING

The objectives of this study are to define the regional and local groundwater flow, and to give quantitative estimates of different dynamic parameters for Ranney wells in Belgrade Water Supply Center. To solve these tasks used the numerical tools to quantitatively model flow through porous saturated and unsaturated media. We used finite element (FE) modeling of underground water flow and developed specific algorithms for the Ranney wells representation. The unsaturated soil hydraulic properties are described for each finite element by applying our 3D interpolation algorithm. Our software for pre- and post-processing Lizza is used, developed for easy modeling of complex engineering underground water flow problems with Ranney wells. The software FE package PAK-P is employed as the solver. This software can handle flow regions delineated by irregular boundaries. The flow region may be composed of nonuniform soils having an arbitrary degree of local anisotropy. Flow can occur in the vertical plane, the horizontal plane, or in a three dimensional region exhibiting radial symmetry about the vertical axis. Constant or time-varying prescribed head and flux boundaries can be handled, as well as boundaries controlled by atmospheric conditions. Soil surface boundary conditions may change during the simulation from prescribed flux to prescribed head type conditions (and vice versa). A seepage face boundary through which water leaves the saturated part of the flow domain can be modeled, and also free drainage boundary conditions. The results of simulation for some real engineering problems (Ranney well RB-8 in Belgrade Water Supply Center) are presented. Downloads