臺灣博碩士論文加值系統

本文針對離岸風機防腐蝕物質進行釋出後之擴散濃度及沉降特性進行研究。海洋環境結構物之腐蝕防治多以陰極防蝕及防腐塗層法最為常見。陰極防蝕可分為犧牲陽極法(galvanic anode cathodic protection, GACP)及外加電流法(impressed current cathodic protection, ICCP)兩大施作工法。現今犧牲陽極塊主要採鋁合金金屬製作，防蝕過程中，犧牲陽極法需面對重金屬釋出後的擴散積累及氣體產物等問題。為探討犧牲陽極塊於防蝕過程中，不斷溶出之金屬離子於海水擴散及累積之情況，本研究以MIKE21海域數值模式模擬彰化離岸風力規劃場址於潮汐作用下，鋁犧牲陽極所釋出之物質擴散濃度及三種不同的沉降速率特性變化。當沉降速率為1m/day時，沉降擴散面積最廣，沉積物累積量為0.044 g/m2；沉降速率10m/day及100m/day之沉降擴散面積明顯集中，其中以10m/day之沉積物累積量較高，其累積量可達0.104 g/m2，所以若沉降速度偏慢，則沉降擴散海域增大，累積量也相對減少。

This paper mainly studies the diffusion concentration and the sedimentation characteristics of the anti-corrosion substances of offshore wind turbines after their release into the water. Corrosion prevention methods for marine environmental structures are commonly practiced with cathodic corrosion protection and anti-corrosion coating method. There are two major ways in cathodic corrosion protection: galvanic anode cathodic protection (GACP) and impressed current cathodic protection (ICCP). Currently, the anode block is made of an aluminum alloy. In the anti-corrosion process, the GACP method faces the problems of diffusion accumulation and gas by-product production after heavy metal have been released. In order to investigate the diffusion and accumulation of eluting metal ions in seawater during the anti-corrosion process, this study utilized the MIKE21 numerical model to simulate the change of the diffusion concentration and sedimentation characteristics of the materials released by the aluminum galvanic anode blocks by the Changhua offshore wind farms under three different tidal velocities. When the settlement speed is 1 m/day, the sedimentation diffusion area is the widest, and the sediment accumulation is 0.044 g/m2. The sedimentation diffusion area is obviously more concentrated when settlement speeds are 10 m/day and 100 m/day. The accumulation of sediment is higher when settlement speed is 10 m/day. Its cumulative amount can reach t 0.104 g/m2.

目錄
誌謝 I
摘要 III
Abstract IV
目錄 V
表目錄 VII
圖目錄 VIII
第一章 前言 1
1-1研究緣起 1
1-2研究目的 4
第二章 文獻回顧 6
2-1離岸風電的歷史與現況以及我國發展概況 6
2-2防腐蝕機制 12
2-3鋁的水化學與海洋中的鋁 17
2-4鋁對動植物和人體的影響 21
2-5鋅犧牲陽極 23
2-6鋁犧牲陽極 25
2-7犧牲陽極化學排放與環境影響 29
第三章 研究方法 31
3-1研究流程 31
3-2控制方程式 33
3-2-1水動力模式 33
3-2-1-1數值離散 35
3-2-1-2乾濕邊界 38
3-2-1-3穩定條件 38
3-2-2風波模式 39
3-2-3水質模式 43
3-2-3-1傳輸方程式 43
3-2-3-2時間積分 43
3-2-3-3起始條件 44
3-2-3-4封閉式邊界條件 44
3-3邊界條件及參數設定 45
3-4模式驗證 48
第四章 結果與討論 49
4-1區域特性 49
4-2沉降速率對水體濃度之影響 57
4-3沉降速率對沉降量體之影響 60
4-4綜合比較 63
第五章 結論與建議 64
5-1結論 64
5-2建議 65
參考文獻 67

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