EXPLICIT TIME-DOMAIN TRANSMITTING BOUNDARY FOR DAM-RESERVOIR INTERACTION ANALYSIS

An explicit time-domain transmitting boundary for the analysis of dam- reservoir interactions is presented. This transmitting boundary is a s emi-analytical solution of the governing wave equation of the far fiel d of the reservoir. By using this transmitting boundary, the radiation condition and water compressibility can readily be incorporated in th e time-domain analysis of dam reservoir systems. Therefore, the finite element method can be used to accurately analyse a dam-reservoir syst em including the semi-infinite reservoir while maintaining its efficie ncy in time-domain analysis. Numerical results have excellent agreemen t with the available analytical solution. Results also show that the p roposed explicit transmitting boundary is more efficient computational ly than the implicit transmitting boundary presented by Tsai and Lee.