Numerical Modelling Of The Interactions Of Dynamical Factors In Coastal Area And The Study On Their Effects On Substance Transport

Study on the wave-tide-surge interaction in shallow sea is one of the up-to-date active research areas around the world. This research has studied the Bohai sea wave-tide-surge interactions and the laws of substance transport. The combined wave-tide-surge numerical model which is composed of two components:a third generation shallow water wave model and a two-dimensional tide-surge model. By adoption this numerical model,the study has emphases on the effect of wave on the wind stress,wave on the bottom stress and radiation stress on the sea level. The study also has researched the effect of tide-surge to wave. On the basis of the simulated current filed by used the numerical model we studied the laws of substance transport. The main results are as follows:1) It is a obvious effect of wave on the wind drag coefficient. The wind drag coefficient can be add up to 1.5 times of origin value when we consider the wave effect on the drag coefficient. It also has changed the sea level. The magnitude of set-up is a noticed number.2) The wave has improved the magnitude of bottom stress in the shallow water,and decreased the current velocity.3) The radiation stress has a strong effect on the sea level. It also make the set-up occurs.4) The sea level and current velocity have an effect on wave height,and the wave direction modulation is small.5) It is more reasonable when the numerical model including the wave-tide-surge interactions,and the numerical results are close to the measured data.6) Tha laws of substance transport under the tide are different from that of the wave-tide-surge.