江苏辐射沙洲南翼海域风浪的波包谱分析  

Analysis of wave envelope spectrum of wind wave at south part of radial sand ridges

作　　者：虞丹君[1] 冯卫兵[1] 杨斌[1,2] 

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]国家海洋局第二海洋研究所工程海洋学重点实验室,浙江杭州310012

出　　处：《应用海洋学学报》2015年第1期10-16,共7页Journal of Applied Oceanography

基　　金：国家自然科学基金资助项目(2012515511)

摘　　要：基于江苏沿海辐射沙洲南翼实测波浪资料,采用波包线理论计算实测波包谱,利用改进的公式对无因次化平均波包谱曲线进行拟合,得到了一个能够反映辐射沙洲南翼海域风浪波包能量分布的波包谱经验公式.同时,考虑了基于波包线理论的群高参数和群长参数,结合实测资料初步建议了此海域群高及群长参数的取值.此外,结合相关统计参数对波包谱经验公式进行了简化,并将计算所得的谱峰值和零阶矩与实测统计值进行对比验证,谱峰值相对误差范围为0.1%-80.0%,均值为23.5%,零阶矩的相对误差范围为0.0%-23.5%,均值为5.0%.从总体上来说,经验公式确定的波包谱与实测波包谱符合较好,对今后辐射沙洲南翼海域的波群理论研究及工程建设具有一定的参考价值.Based on the wave data at south part of radial sand ridges,the measured wave envelope spectrum was computed by using the envelope theory. Besides,an improved formula was utilized to fit the normalized average wave envelope spectrum and an empirical wave envelope spectrum that reflects the energy distribution of wind wave at south part of radial sand ridges was obtained. Meanwhile,wave group height and group length were both considered and more reasonable parameter value suitable for this area were recommended. In addition,the formula of the empirical wave envelope spectrum of wind wave was simplified by substituting the relevant statistical parameters into the formula. The value of spectral peak and zeroth moment of empirical envelope spectra was compared with the measured envelope spectra. The results show that the ranges of relative error were 0. 1% ~ 80. 0% and 0. 0% ~23. 5%,respectively,and the average value was 23. 5% and 5. 0%,respectively. Overall,the empirical wave envelope spectra were coincided well to the measured wave spectra and this study should provide certain reference forthe wave group theoretical research and engineering construction in the future.

关 键 词：物理海洋学 波包谱 波群 群性参数 辐射沙洲 

分 类 号：P731[天文地球—海洋科学]