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題 名 | 使用水下波壓訊號推算水位變化=Time Series Sea-Elevation Recovery from Wave Pressure Signals |
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作 者 | 邱永芳; 郭一羽; 唐世澤; | 書刊名 | 港灣技術 |
卷 期 | 12 1997.01[民86.01] |
頁 次 | 頁1-22 |
分類號 | 443.1 |
關鍵詞 | 波壓訊號; 水位變化; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究利用Kuo and Chiu(1994)所提出之波高波壓之經驗轉換函數配合快速傅立葉轉換(FFT Method),由水下壓力計所測得之波壓訊號,來推算水位變化的時間序列訊號。將Nielsen(1986)所提出之LCM法及本文所使用之快速傅立葉變換法同時對不同的波高與波壓轉換關係做比較分析。研究結果發現,在波壓計放置深度較淺時,利用FFT法與LCM法經由經驗轉換函數皆可較線性理論準確的計算水位訊號。但隨著壓力計放置的位置愈深時,使用經驗轉換函數之FFT法,將可得到較佳的準確性。本文同時對由波壓訊號轉換成水位訊號的各種方式皆會面臨的截斷頻率界限無法明確決定的問題提出簡易而明確的判斷式。 |
英文摘要 | In the present study an empirical transfer function between the wave pressure and wave height, which was established by Kuo and Chiu 1994, was applied to predict the history signals of the free water surface elevation from the wave pressure beneath the still water level. The Fast Fourier Transform (FFT )method is used to clalculate the power spectral and history signals of wave height. The FFT method is compared with LCM method developed by Nielson (1986)in this paper. It is found that both of FFT method and LCM method are accurately calculated when the pressure gages are locatted near the still water level. However, when the distance between the pressure gage and the still water level is longer, the FFT method with the empirical transfer function is more efficient and accurate than the LCM method. Furtherwore, the present study has decided on the cutoff frequency range, the weak point of the power spectral analysis which was resolved in this paper. |
本系統中英文摘要資訊取自各篇刊載內容。