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Field observations were conducted on the morphology and hydrodynamics around the Tenryu River mouth. The sand bar was eroded by storm waves followed by flood due to the typhoon in September, 2013, which significantly changed the water level variations inside the river mouth. The large friction at the narrow opening of the river mouth was found to raise the daily-averaged river water level by 0.2 m. The presence of sand bar appeared to decrease the intrusion of tides and waves into the river. The transmission coefficient of waves increased from 0.2-2 % to 2-5 % as the cross-sectional area at the river mouth was increased. The water level variation due to tides and wave setup was found even at 3 km upstream from the river mouth.

Field Observation of Sand Bar Deformation and Hydrodynamics around the Tenryu River Mouth