A High Resolution Flow Field Simulations of Dongsha Island

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Project title

Code/計畫編號

MOST105-2221-E019-043-MY2

Translated Name/計畫中文名

東沙環礁海域-高精度東沙環礁海域流場之模擬

Project Coordinator/計畫主持人

Shin-Jye Liang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

許泰文

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=12027122

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

31-07-2018

Co-Investigator(s)

Tai-Wen Hsu

Bugetid/研究經費

676千元

ResearchField/研究領域

土木水利工程

"東沙環礁海域由於水淺、地形變化陡峻，其波流場非常複雜。數值模擬有其挑戰性，例如：複雜地形、流場由亞臨界流到超臨界流之轉換、波的傳遞與衰減、碎波與湧浪、以及控制方程式之非線性與點源處理等，這些因素都會影響計算結果之穩定度與精確度。本計畫中，我們將先以高精度（5-250 m）之靜水壓（hydrostatic）淺水模式模擬東沙環礁海域之波流場。該模式採不規則三角形或四邊形網格計算網格，淺水方程式則以空間時間有限元素法求其近似解；然後再將模式改良為非靜水壓（non-hydrostatic）淺水模式，以增進模式之精確度與適用性。計算結果會與2D 布氏（Boussinesq）模式與3D POM（Princeton Ocean Model）模式結果比較；同時，我們會在模式中引入風剪應力、以模擬季風與颱風對東沙環礁海域波流場之影響。預計完成之工作項目包括︰第一年（8/1/2016 ~ 7/31/2017） : - 建構高精度度東沙環礁海域水深模型與計算網格 - 利用靜水壓淺水模式模擬東沙環礁海域之波流場 - 比較布氏模式與POM 模式之計算結果第二年（8/1/2017 ~ 7/31/2018）: - 加入風應力效應、探討颱風對東沙環礁海域波流場之影響第三年（8/1/2018 ~ 7/31/2019） : - 利用非靜水壓淺水模式模擬東沙環礁海域之波流場 - 比較布氏模式與POM 模式之計算結果" "Due to steep offshore slope and abrupt transition to a shallow lagoon of Dongsha (also called Pratas) Atoll, simulations of its flow and wave field is challenge. Complex bathymetry, transition between sub and super-critical flows, propagation and attenuation of waves, wave breaking and bore formation, and treatment of nonlinearity and source terms of the governing equations all affect the stability and accuracy of model predictions. In this study, a high resolution (5-250 m) hydrostatic shallow-water (SW) model to simulate the flow/wave field around Dongsha Atoll. The model is based on the unstructured triangle or quadrilateral elements and space-time finite-element method. A non-hydrostatic SW model for fringing reef environments will also be developed to extend the applicability and improve accuracy of the model. Computed results will be compared with results of 2D Boussinesq model and 3D POM model. Effect of monsoon and typhoon on the hydrodynamics of Dongsha Atoll water will also be investigated. Tasks to be carried out include: 1st year (8/1/2016 ~ 7/31/2017): - Construct a high resolution bathymetry model and computational meshes for Dongsha Atoll water - Simulate the flow/wave field of Dongsha Atoll water - Compare computed results with that of 2D Boussinesq model and 3D POM model 2nd year (8/1/2017 ~ 7/31/2018): - Integrate effect of monsoon and typhoon on Dongsha Atoll water 3rd year (8/1/2018 ~ 7/31/2019): - Develop and apply a high resolution non-hydrostatic SW model for Dongsha Atoll water - Compare computed results with that of 2D Boussinesq model and 3D POM model"

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A High Resolution Flow Field Simulations of Dongsha Island

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