Abstract
When tunami analysis is conducted, some probrems occuer according to open boundary with wave dumping layer. Reflected waves from open boundary or wave dumping layer effected to the analysed results. We studied these probrems by easy theoretical approach. We found wave number modulation occuer in wave damping layer and Sommerfeld's open boundary condition can not be satisfied. Moreover we note that wave reflection also generated in wave dumping layer. We confirm these two generation system of reflected waves by model equation analysis. After comparison numerical simulation and theoretical approach, waves reflected in the wave dumping layer in this study condition. We pointout that wave dumping layer should not be use in long wave nanalysis include tunami analysis.
