以四元樹自調適法預報熱帶氣旋之波浪場

Using a Quadtree-Adaptive Model to Predict Waves Generated by Tropical Cyclones

侯典轟(Tien-Hung Hou) ； 蔡加正(Chia-Cheng Tsai)

《海洋工程學刊》 13卷3期 (2013/09) Pp. 189-200

https://doi.org/10.6266/JCOE.2013.1303.01

摘要

本研究描述一個四元樹之自調適網格應用於波譜模擬之計算。通常在波浪後報與預報這一類的模擬中，為了求得準確的數值，模式通常需要提高波浪解析的精確度。然而，四元樹自調適網格法的網格可以隨著熱帶氣旋之風場強度而自動調適加密，藉此增加波浪場之解析度，使得模擬數值之結果與資料浮標之實測數據更加接近。簡而言之，當模擬時四元樹網格會伴隨著熱帶氣旋行進而自動移動並加密，而且可以減少多餘網格的生成，並且可以縮短電腦運算的時間來增加模式執行效率，文中亦對波高進行實測浮標資料之比對驗證本模式之合理性。除此之外，模式在往後研究可以再延伸至模擬全球性的波浪預報或自動化之模組，並以有效率的格網數執行模式來提升網格解析度與提高波浪預報模式執行之效能，倘若再利用平行計算的輔助，則可進一步提升模式的工作效率。

關鍵字

四元樹網格法 ； 熱帶氣旋

並列摘要

In this study, we describe the application of a quadtree-adaptive model to hindcast and forecast wave spectra during tropical cyclones. In the simulation, the quadtree grid system can be adapted to the vicinity of the tropical cyclone and/or some prescribed regions of interest, which require higher resolutions. In other words, the quadtree grid system can move with the tropical cyclone and reduce the number of grids. We also compare our simulation results significant wave height measured by buoys to verify the rationality of our study. The proposed adaptive model can significantly save the time required for a specific simulation and is very convenient for a large-scale operational forecasting when multiple resolutions are required.

並列關鍵字

quadtree ； tropical cyclone