sediment movement and stress conditin in sea bed

摘要

The stress conditio in the sea bed such as effective stress and hydrodynamic condition were measured in the surf ozne to understand the detailed mechanism of local and temepoiral sediment moveemtn.Analysis of the measured data suggests that the large effective stress drop and strong flow in the onshore direction when the wave crest passes are the possible cause for ht esand movement in the surf one.It is also found that the sea bottiom elevatin change can be evaluated from the effective stress in the sand by a simle equation.the effective stress senso used in the field mesurement was proved to be useful in estimating local and temporal sediment transprot.