Prediction And Its Application Of Seabed Evolution Under The Action Of Coastal Engineering

The hydrodynamic forces, tidal prism and sediment transportation will be influenced after carrying out the coastal project, the terrain people's lives and ecological environment will be greatly influenced. Study the changes of hydrodynamic condition and sediment scouring and silting are the demands of port engineering and prediction and control of coastal evolution. It's to be solved in coastal dynamic geomorphology and coastal engineering, and is a rational use of tideland resources, planning deep channel port and decorating wharf engineering, the laying of submarine pipeline, setting up the coast protection engineering.Now on the research of the effects of sediment scouring and silting on the surrounding area after the project, two methods, hydrodynamic equations,bed deformation equation and experience formula are adopted to calculate basic adopts the river bed deformation or calculation. But in tidal bay tidal range, tidal power is needed to consider. Based on bed deformation equation, coast dynamics theory and some assumptions, the correction equation of sediment scouring and silting in different areas are combined. For sediment deposition and erosion in different areas, the equation takes the following form:Then this method is applied to the reclamation engineering in Xuanmen bay, through sediment calculation results, the variation laws in this area, which are scour and deposit quantity, distribution and the time that achieve dynamic balance of sediment, are studied. The analysis suggests that in the region after project, the maximum amount of erosion and deposition in the seabed for 0.06 m, the time that achieve the balance of erosion and deposition is 3 years, the maximum Sediment deposition for 0.5m.