采用混合模型数值模拟从深海到浅海内波的传播

Numerical simulation of the spread of internal waves see from deep sea to shallow sea from the mixed model

在南海东沙岛附近,从MODIS遥感图像发现内波传播是从深海经陆架坡再到浅海,由于深海和浅海环境条件的差异以及传播模型的适用条件不同,因此不能采用同一模型模拟内波的传播,需用两种模型来分别模拟内波在深海和浅海中的传播.采用差分法,首先用非线性薛定谔方程模拟了深海内波的传播,然后用EKdV方程模拟了内波在浅海中的继续传播.模拟结果与实际的MODIS遥感内波图像相符合,并与应用单一模型模拟结果相比,混合模型模拟该海区的内波传播更接近遥感实测,表明了混合模型的合理性.

From remote sensing images,it is found that the internal wave spreads from deep sea,by shelf slope,to shallow sea in the South Chinese sea.Because of the different environmental conditions and model applicabilities,it is the best to use two models to simulate the spread of ocean internal waves in deep or shallow sea.The spread of waves in deep sea is simulated with the nonlinear Schrodinger （NLS） equation first and then the spread of wave in shallow sea is simulated with the extended Korteweg de Vries（EKdV） equation by differential mathod.It can be found that the results are in good agreement with the actual remote sensing images,compared with those obtained by single model which consists of the NLS equation or the EKdV equation.