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題名 | The Generation of Three Dimensional Nonlinear Random Rough Sea Surfaces=非線性三度空間海洋隨機粗糙表面模式之研究 |
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作者 | 謝金原; | 書刊名 | 國立高雄海院學報 |
卷期 | 14 1999.07[民88.07] |
頁次 | 頁45-66 |
分類號 | 351.927 |
關鍵詞 | 海洋隨機粗糙表面; 海洋垂直傾斜; 水平傾斜; |
語文 | 英文(English) |
中文摘要 | 本論文主旨以發展一數學理論模式使產生具方向性的海洋隨機粗糙表面。本論文係假設具 有隨機高度、相位及方向之海洋表面是由無數個線性海洋波形所組合而成。因考慮海洋隨機粗糙表 面的非線性,本論文所發展的海洋隨機粗糙表面的數學理論模式包含高階項。Tayfun所發展的海洋 模式因僅包含海洋垂直傾斜之海面特性欠缺水平傾斜之海面特性,導致該模型缺乏實用性。本論文 因此推導一新的理論模式以解決水平傾斜之海面特性,以彌補Tayfun理論模式之不足。經統計分析 證實本論文所發展的理論模式與實測數據相當吻合。 |
英文摘要 | Abstract- A new model for directional sea surface generation is presented in this paper. The mathematical model utilized assumes that the linear approximation to the ocean surface is a superposition of several wavelets with random amplitude and phase, and direction. To include nonlinearities, the model equation can be expanded to contain higher power of the individual terms. The model given by Tayfun generates surface profiles only with the vertical skewness but without the horizontal skewness. The model developed in this paper, generates profiles with horizontal skewness. In radar cross section measurements, horizontal skewness is expected to account for the difference in returns at the azimuth angle of 0 degree and 180 degree. A skewness function is introduced to describe the sense of the directional sea surface in this paper. It is incorporated into the Kirchhoff approximation model to accommodate the surface nonlinearities. Statistical analysis shows that the model developed in this paper agrees very well with the measured results. The difference between the mathematical simulation and measured data is within a dB. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。