非线性相互作用对高频方向谱估计的影响  

Nonlinear Contributions to Directional Spectra in High Frequencies for Wind-Generated Waves

作　　者：赵栋梁[1] 

机构地区：[1]青岛海洋大学物理海洋研究所

出　　处：《青岛海洋大学学报（自然科学版）》1998年第4期531-535,共5页Journal of Ocean University of Qingdao

基　　金：教育部留学回国人员科研基金

摘　　要：海浪组成波之间的三阶非线性相互作用产生的高次谐波，不仅改变了波面的外观形状，而且使得高频域不再满足通常的线性频散关系，当ｆ＞１．７ｆｐ时，频散关系应修改为ω２＝２ｇｋ。用最大似然法（ＭＬＭ）分析方向分布的结果表明：在二倍峰频附近，方向分布再次变窄，且能量在方向上的集中程度与海浪的成长状态有关，得到的高频方向分布跟Ｃａｕｄａｌ和Ｈａｕｓｅｒ（１９９６）的微波遥感结果定性一致。The presence of harmonics or bound waves generated by nonlinear interaction of wind-generated waves alters not only the appearance of wave surface but also the linear dispersion relations which fit to free gravity or foundamental waves. When the frequency is larger than 1.7f p, the dispersion relationship should be modified as ω 2=2 gk . Appling this formula to directional analysis by the maximum likelihood method (MLM), it is shown that the directional spreading width becomes narrower again in the region of twice peak frequency and this concentration of energy also depends on the wave state. This result agrees qualitatively with the microwave sensing observations given by Caudal and Hauser(1996).

关 键 词：海浪 非线性 相互作用 频散关系 方向谱 

分 类 号：P731.22[天文地球—海洋科学]