1- INTRODUCTION: THIS PAPER PRESENTS A 2DV NUMERICAL MODEL FOR NONLINEAR WAVES BASED ON VOF TECHNIQUE, BY DEVELOPING WISE MODEL. ALTHOUGH WISE [1] USES AN ARBITARY LAGRANGIAN-EULERIAN DESCRIPTION, A STRUCTURED MESH BASED ON EULERIAN DESCRIPTION HAS BEEN UTILIZED FOR SURFACE RECONSTRUCTION. ALTHOUGH THE SET OF EQUATIONS USED IN WISE MODEL IS SECOND ORDER ACCURATE IN TIME AND SPACE, AS ADVECTION PLAYS A MAJOR ROLE IN FLOW CHARACTERISTICS, A FIFTH-ORDER SHAPE FUNCTION IS USED FOR ADVECTION OF VELOCITY FIELD. AFTER DETERMINING WATER SURFACE, A VOF METHOD IS USED FOR SURFACE RECONSTRUCTION .TO MINIMIZE THE INACCURACIES ASSOCIATED WITH THE ADVECTION OF VOF STEP FUNCTION AND CONSIDERING THE FACT THAT THE ADVECTION SCHEME USED FOR TRANSPORT EQUATION IS NUMERICALLY DIFFUSIVE, YOUNGS’S METHOD IS USED FOR ADVECTION OF THIS FRACTIONAL FUNCTION TO RECONSTRUCT SURFACE MORE ACCURATELY.