A Two-Way Nesting for Shallow Water Model.

A multiply nested technique shallow water model is described. A new algorithm for the implementation of a two-way nesting approach is presented. The two-way nesting technique is successfully applied for 2D shallow water equations using explicit finite difference scheme. This model consists of a higher-resolution (fine grid) model with nested 3:1 embedded in a lowresolution (coarse grid) model on which covers the entire domain. The formulation of the mesh nesting algorithm of the structure grid model allows flexibility in deciding the number of meshes and the ratio of grid resolution between adjacent meshes. The two-way nesting is satisfied with an interpolating of the coarse grid domain to provide boundary conditions for the fine grid region and by updating the variables on the fine grid is suitably averaged on to the coarse grid in order to drive the coarse grid model. Several of the numerical examples are investigated to check the ability and efficiency of nested grid model. The results show indicate good performance of the nesting grid. [ABSTRACT FROM AUTHOR]