群波在斜坡上的爬落变化研究

通过理论推导，将群波分解为线性项和非线性项，讨论群波非线性项在不同水深条件下的影响情况，试验中取各组成波波高相等，频率间隔０．０２Ｈｚ，通过模型试验研究群波在斜坡上的爬落变化，并与相应于群波有效波高的规则波的试验成果和经验公式进行对比分析，发现群波和规则波在斜坡上的爬高和爬落幅度的规律大致相同，而落深存在一定差异，即当Ｉｒｉｂｒｒｅｎ数较小时，规则波没有回落现象，运用谱分析方法研究群波在斜坡上的爬

Runup and Rundown of Group Waves on Smooth Slopes

Through theoretical analysis, group waves are decomposited into linear and nonlinear terms,in which the effect of each term is discussed under various water depth.The runup rundown and its amplitude of group waves on smooth slopes are explored through model tests,in which the group waves consist of two wave series with equal wave height and the frequency interval is 0 02 Hz. A comparison with the pertinent conclusions of empirical formula and test data for regular waves that the wave height equals to the significant wave height of group waves shows that the runup and runup rundown amplitude of group waves are similar to those of regular waves,yet there is some difference as far as rundown is concerned ,that is ,when Iribarren number is small,there is no rundown for regular waves.The runup rundown spectra of group waves on smooth slopes are detected by means of the spectral analysis method.It is found that the runup rundown spectra are influenced by the water depth,the frequency of component waves and the slope.Both test data and computed results show that runup and rundown of group waves on smooth slopes are markedly affected by nonlinear terms.