Tsunami　wave　characteristics　are　greatly　influenced　by　the　initial　water　level　when　they　attack　structures.　In　this　study,　experimental　and　numerical　investigations　were　conducted　to　investigated　the　relationship　between　tsunami　wave　characteristics　and　initial　water　levels.　Results　showed　that,　the　wave　height,　wave　velocity,　and　Froude　number　increase　with　the　increase　of　tsunami　wave　intensity;　the　time　history　of　water　levels　were　influenced　by　the　different　initial　water　level　conditions;　the　analytical　solution　proposed　by　Chanson　(2005)　may　be　extended　to　wet-bed　conditions　(for　initial　water　level　＜　0.36　tsunami　bore　height　in　our　experimental　set-up).　Due　to　the　limitations　of　experimental　ranges　in　the　laboratory,　the　validated　numerical　model　can　provide　more　results　for　wider　experimental　ranges　for　tsunami　bore　investigations.　It　was　observed　from　numerical　results　that,　tsunami　bore　height　increases　with　the　increase　of　reservoir　water　level;　tsunami　bore　velocity　decreases　with　the　increased　initial　water　level　on　the　bed;　as　the　initial　water　level　on　the　bed　gradually　increases,　the　mean　tsunami　bore　Froude　number　shows　a　downward　trend.　©　2023,　University　of　Zagreb　Faculty　of　Mechanical　Engineering　and　Naval　Architecture.　All　rights　reserved.