Analysis of Natural Wind Speed Profile of Taiwan West Coastal Area

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Project title

Code/計畫編號

MOST107-2221-E019-005

Translated Name/計畫中文名

台灣西部沿海地區自然風場風速剖面之研究

Project Coordinator/計畫主持人

Jing-Jong Jang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=12619913

Year

2018

Start date/計畫起

01-08-2018

Expected Completion/計畫迄

31-07-2019

Bugetid/研究經費

536千元

ResearchField/研究領域

土木水利工程

目前世界各國積極發展綠色能源，臺灣也不例外，利用風力發電便是其中之一，台灣的離岸風電發展在政府大力推展下，獲得業界的重視，甚多開發商已經啟動環評及可行性研究，海洋風電未來數年將有數千億元的投資金額；但是臺灣位處颱風盛行地區，每年約有3至4個颱風會侵襲台灣，每年颱風往往對臺灣造成的損害不容小覷，對於是否會影響海上風力發電機結構，造成損壞，還有其後續的維修與停工經濟損失影響甚鉅。臺灣現行的耐風設計規範大多參考美國規範，然而美國大陸型氣候和臺灣海島型氣候其實不盡相同，因此建立臺灣本土評估模式，對未來臺灣沿海風電結構物的穩定及安全性有很大幫助及貢獻。台灣地處太平洋颱風盛行的地區，又在颱風移動路徑上，夏秋兩季常受颱風侵襲，帶來强力的烈風與風壓，在這些颱風影響下，實際的梯度高度及風速剖面將不同於理論上的平均分佈；事實上，梯度高度以上之風速變化難以預測，只能從現有的風速資料進行分析與迴歸，從而評估出實際的風速極值，再以此風力來設計結構物，才能確保不會低估結構之安全性，準確用料亦能提高建築結構之經濟性。本計畫結合主持人之土木結構設計風工程專長，首先將收集臺灣西部地區自然風場的數據，主要針對颱風時期強風資料進行分析，確立颱風強風時期之極值風速分佈狀況；利用數據推算最為接近之α值且繪製成圖，接著使用極值分布函數理論，繪製累積機率分布曲線及求得基本設計風速，並換算成不同回歸期之設計風速。臺灣現行風力設計規範雖有參照臺灣的地理、環境氣候等條件修訂風速剖面之α值及梯度高度Zg值，但對於目前沿海地區卻無適合的風速剖面參數，很多地方還有改善空間，希望經由本研究計畫之執行，提供臺灣西部沿海地區的風場資料，可以作為海上風電機塔設計及場址選定的參考也可以提供未來台灣耐風設計規範在增修相關結構設計規範條文之參考。 In recent years, the gradual shortage of petroleum energy, combined with the greenhouse effect, the awareness of sustainable green energy is gradually gaining momentum. At present, it has alternatives such as nuclear power generation, hydro power generation, solar power generation, wind power generation and tidal power generation. Among them, how to effectively use cleaner natural energy, the wind energy is currently the research project of all countries.At present, all countries in the world are actively developing green energy. Taiwan is no exception. The use of wind power is one of them. Taiwan's offshore wind energy development has been vigorously promoted by the government and won the attention of the industry. Many developers have started the environmental impact assessment and feasibility study. In the next few years, there will be hundreds of billions of dollars of investment in offshore wind power.However, Taiwan is a subtropical island and located at the Pacific Ocean Rim where typhoons occurred frequently and lots of buildings and structures were damaged every year. The current Taiwan building design code for wind resistant design was revised in recent year. The wind pressure is function of wind speed V(Z) with parameters α and gradient height Zg. The wind speed profile coefficients introduction into the current building code for wind resistant design is based on the codes of U.S. and Japan. Up to today, there are few data or researches about the natural wind filed of Taiwan coastal area. Thus, this research will focus on the wind speed profile coefficients especially for Taiwan west coastal area during typhoon period.This research will continue collect the strong wind speed distribution data from the National Weather Bureau and the Department of Atmospheric Science, National Taiwan University and some private offshore wind energy developers. We will study the design wind speed of different return period using extreme value distribution function theory and the effect of the ground roughness for wind speed distribution profile which is varied with height during typhoon. At last, basic design wind speed and a wind speed profile coefficient will be proposed. The results and conclusions or suggestions of this research will be helpful for future offshore structure wind resistant design with revised terrain coefficient (α). It will also be useful for the future coastal structure design codes revision and benefit the whole structure engineering society.

Keyword(s)

自然風場
風速剖面
台灣西部沿海地區
離岸風電
風力機塔
natural wind field
wind speed profile
Taiwan west coastal area
offshore wind energy
wind turbine tower

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Analysis of Natural Wind Speed Profile of Taiwan West Coastal Area

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