斜向和多向波浪的破碎指标研究

Study on the breaker indices of oblique and multidirectional waves

该文通过水池物理模型实验,研究了在1:15的斜坡条件下斜向和多向波浪中破碎的特点。根据波浪类型和岸坡条件将破碎指标分为四类,总结了每一类破碎指标公式的通用形式和系数。对实验中正向和斜向规则波、正向和斜向不规则波、正向和多向不规则波的破碎指标进行了比较和分析。研究结果表明:同等条件下,斜向波的破碎指标较正向波偏大,基于不规则波有效波高的破碎指标小于规则波的,而多向波在波高较大时的破碎波高与正向不规则波相比偏小。

Laboratory experiments are conducted with normal, oblique and multidirectional waves on a plane beach with a slope of 1：15to investigate the wave breaking characteristics.The breaker indices are divided into four categoriesaccording to wave types and slope conditions.Its general forms and coefficients are summarized. Furthermore,the breaker indices of normal and oblique regular waves, normal and oblique irregular waves, normal and multidirectionalirregular waves are compared and analyzed. The analyzed results show that under the same conditions, the breaker indices of oblique wavesare larger than that of normal waves, The breaker indices defined with significant wave height of irregular waves arelower than those of regular waves, and breaking wave height of multidirectional wavesis lowerthanthat of normal irregular wavesfor larger waves.