The second inlet of Saloma Lake was made in 1979, and was closed by sand transport at first time at January 2012. The characteristics of topography change from 2001 to 2012 around the Inlet were understood. Primary factors of this closing phenomenon are the increase of long shore sediment transport towards left caused by waves, and the increase of discharged sediment from Tokoro River. The increase of discharged sediment was caused by increasing rain fall because of the global warming, and this phenomenon is happening in a long term. The change of ocean wave direction can be estimated by the change of sun spot number with about ten years period.
