Wave characteristics and hydrodynamics at a reef island on Dongsha Atoll in the South China Sea

淡江大學機構典藏 > 工學院 > 水資源及環境工程學系暨研究所 > 會議論文 > Item 987654321/119008

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题名:	Wave characteristics and hydrodynamics at a reef island on Dongsha Atoll in the South China Sea
作者:	Su, Shih-Feng;Chiang, Te-Yun;Lin, Yi-Hao;Chen, Jia-Lin
日期:	2017-04
上传时间:	2020-07-28 12:11:09 (UTC+8)
摘要:	An inhabited coral reef island, located at the Dongsha Atoll in the northern South China Sea, is frequently attacked by typhoon waves. Coastline has suffered severe erosion and coastal inundation during certain typhoon paths. Groins were therefore built surround the island to stabilize the shoreline. However, the engineering structures redistributed the characteristics of hydrodynamics, which resulted in the disappearance of seasonal sediment movements on the reef flat. Additionally, infragravity waves (20-200 sec) on reefs have be found to generate strong resonance during energetic wave events. To understand wave characteristics and nearshore circulations around the reef under typical waves and typhoon waves, a phase-averaged and a phase-resolving wave models validated with previous field experiments are used to simulate significant wave height, wave setup and reef circulations. The phase-resolving model is specially applied to investigate infragravity motions around the island. Model results will illustrate the spatial variations of infragravity-wave field and wave-induced nearshore circulation and can provide information for coastal management and protection.
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