Developing Features of Sandy Coast in Rizhao and Stability Analysis

Based on the high-precision repeated observations on the representative cross-section and grain size analysis on surficial sediment,the short-term shoreline evolution dynamics in the winter in 2010 were studied.Combined with the topographic maps and remote sensing images,long-term shoreline evolution was also discussed.The results show that beach ridge-tidal creek is representative topographical feature.Beach ridges commonly develop between high tidal zone and middle tidal zone.Tidal creeks commonly develop between middle tidal zone and low tidal zone.The phenomenon that beach ridges swing landward is a typical signal of coastal erosion,which can be attributed to the strong impulse wave overtopping.The overall tendency that high tidal zone was eroded and low tidal zone is filled up can be clearly revealed in the winter in 2010.The coast is slowly eroded in short term and erosion pattern alters from drawing back to scouring vertically.