An observation of sand ripple profile in nearshore area in the Ogata coast and its reproduction model tests

Abstract

Sand ripple profile in nearshore area in the Ogata coast, Niigata was measured under the stormy wave condition. A reproduction model test for the sand ripple in the Ogata coast was conducted in the twodimensional wave basin using the irregular wave similar to the wave conditions in the field, applying Ito and Tsuchiya's scale model relationship and time scale. Characteristics of sand ripple forms by model tests and in the field are discussed using dominant parameters such as the orbital diameter, the Shields number, and the sand grain Reynolds number that were obtained from sediment and wave conditions.