Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/15828
標題: 以類神經網路預測直立堤波浪越波量之研究
Determination of Wave Overtopping Rates at Vertical Breakwater Using Neural Network
作者: 何俊燐
Ho, Chuen-Lin
關鍵字: neural network;類神經網路;overtopping;vertical breakwater;越波量;直立堤
出版社: 土木工程學系所
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摘要: 
波浪越波量之估計對防波堤或海岸結構物設計而言是一個很重要的項目,然而卻沒有適當的經驗公式同時考慮防波堤頂出水高度、胸牆寬度和波浪尖銳度對越波量的影響,因此對於具有胸牆寬度之直立堤不規則波越波量目前仍難以求得。本文嘗試以類神經網路來估算具有胸牆寬度之直立堤不規則波越波量。

本文首先由規則波試驗之結果,經由類神經網路之訓練及測試,探討最佳之類神經網路參數和架構,包括最佳之輸入參數、隱藏層層數、隱藏層神經元數目、學習速率、慣性因子和循環次數等,得出以輸入相對出水高、胸牆寬度和波浪尖銳度可得最小之訓練及測試誤差,因此建立本文類神經網路預測模式,以輸入上述3個參數即可得最佳之預測結果。而後於模式驗證中,得出該模式對於直立堤有無胸牆之情形皆有良好之預測結果,可知類神經網路具有相當良好之應用。基此,對於不規則波之越波量預測可由JONSWAP波譜以零下切法分割出1000個成份波,而後以類神經網路對這些個別成份波預測其越波量,再由Goda (2000)不規則波越波量計算式,即由個別成份波越波量總和除以總時間,求得不規則波平均越波量。由所得之預測結果可知,相對出水高越大則越波量越小,增加胸牆寬度可降低越波量,而在固定波高情況下,對於較大之波浪尖銳度有較小之越波量。由具有胸牆直立堤之越波量與無胸牆直立堤之越波量的比值關係,本文提出可供實際設計參考之曲線圖。

The determination of wave overtopping is an important item for the design of a breakwater or a coastal structure. There was no empirical formula available for overtopping rates of irregular waves including influences simultaneous of the freeboard, wave steepness, and the width of the parapets. This paper presents application of artificial neural network (ANN) to the determination of the overtopping rate at a vertical wall with a parapet, including these parameters.

The ANN first learned from physical model tests of regular waves, from which the ANN obtained a very good agreement between the predicted and measured values of the normalized overtopping rates. For an irregular wave train with JONSWAP spectrum, a time series of 1000 waves was created using zero-downcrossing method. The ANN then calculated the overtopping volumes of individual waves. Exemplary design curves of mean overtopping rate over the duration of the time series are obtained for practical application.
URI: http://hdl.handle.net/11455/15828
其他識別: U0005-2208200815251800
Appears in Collections:土木工程學系所

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