EXPERIMENTAL INVESTIGATION ON DYNAMIC EQUILIBRIUM BAY SHAPE

[摘要] Equilibrium bay is a bay that its shoreline is stable and does not change with time in long term. This concept can be applied for coastal protection. Experiments on dynamic equilibrium bay planform are conducted in a laboratory.There is one location of sediment supply source into a bay near upcoast headland and its magnitude vary from case to case.Wave obliquity varies from small to moderate values.These are two main parameters while wave condition is kept constant. The final bay planformsareinvestigated and recorded once they reach equilibrium with condition thatsediment transport gradient approaches zero and no further shoreline change are observed. The parabolic equation similar to that for static equilibrium is newly proposed.The coefficients are originally derived and found to be a function of wave obliquity and the ratio of sediment supplied into bay to longshore sediment transport.The new dynamic equilibrium bay equation can be used and applied to study morphology change with variation of supplied sediment from inland.

[学科分类] 建筑学

[关键词] dynamic equilibrium bay;parabolic bay equation