| 摘要: | 為達到政府2025年非核家園目標，離岸風電為其中重要綠能政策之一，而海域地質條件又關係到風機基礎穩定及維運安全。地調所本於「海洋地質調查」的業務職掌，規劃在離岸風電場址進行海洋地質環境調查，提供基礎地質環境資料，補足離岸風電地質環境資料缺口。因此，自111年起地調所推動此4年期「離岸風場海域地質調查及地質環境資訊服務 (1/4)」科技計畫，並規劃於離岸風電開發區域進行詳細地質調查及地質與環境感知系統建置。預期能建構友善綠能風電產業環境，讓離岸風機綠能產業在既有完善的地質環境下，節省細部地質調查時程與經費，加速風機建構。其中浮台式風機主要設置在水深深於50米區域，風機基樁會錨定於海床，因此海床底質及淺層地層條件對於風機安全至關重要。 本團隊將參與此4年期計畫中的「高解析地層及海床地貌調查計畫」，作業重點是探測並分析風電潛能場址的海床特徵物、海床底質特性及淺部地層構造，並繳交相關探測與分析結果供海域地質資料庫建置使用。因此，本團隊規劃於111年度計畫調查區域內進行以下5項探測作業：（1）為瞭解海床下淺於500 m以上的淺部沉積層的精細地層構造，預計使用電火花震測系統來進行測線長度至少200 km以上的震測資料收集與處理，並搭配調查區域內既有震測資料作分析；（2）為瞭解海底地貌特徵及近海床淺於50 m的淺部地層特殊構造與沉積特徵，預計使用底拖聲納來進行測線長度至少200 km以上的側掃聲納與底質剖面資料收集、處理與分析，且提供海床影像探測作業站位的參考；（3）為能判釋海底特殊地形構造，預計使用船載多音束測深系統來進行面積至少300 km2的水深資料收集、處理與分析，且提供海床影像探測作業站位的參考；（4）為瞭解火成岩體、沈船和未爆彈的分布範圍，預計使用表拖磁力儀來進行測線長度至少200 km的磁力資料收集、處理與分析，且提供海床影像探測作業站位的參考；（5）為能確認海床底質特徵及分類，以及辨識海床上特徵物體性質，預計使用水下拖曳式即時攝影系統來進行測線長度至少5 km或時間5小時以上的海床影像觀測資料收集、處理與分析。 ;Offshore wind power is one of the critical renewable energy to achieve the goal of nuclear-free homeland by 2025. Offshore geological condition is extreme crucial to maintain the safety of offshore wind turbine structures. Base on the responsibility for the “Offshore geological Investment” plan, Central Geological Survey has planned to investigate the marine geological environment of the offshore wind farm field. Providing the fundamental information of geological environment can help to make up the deficiency of the offshore wind farm field geological data. Start from 2022, Central Geological Survey open the project, “Geological survey of offshore wind farms and geological environment information services (1/4)”, aims to collect the detail geological and geophysical survey and establish the environmental sensing system. The results of this project are expected to provide the friendly environment for the wind farm industry and promote the construction of the wind turbines by saving time and money for detail survey. For the deep water environment (water depth more than 50 m), the floating wind turbines anchor the construction pile into the seafloor. Therefore, it is very important to understand the seafloor geology and surficial seafloor geological condition for the security of the wind turbines. In “High resolution stratum and seabed geomorphological survey (1/4)” project, the main targets of the offshore survey are analyzing the seafloor features of the potential wind farm fields, the characteristic of the seafloor geology, the seafloor surface structures and further providing the related survey and analyzed data to build the offshore geological database. In this respect, we have suggested 5 survey operations within the survey area in 2022, including (1) To understand the detail structure in shallow strata less than 500 m depth, we plan to collect and analyze Sparker seismic reflection data for at least 200 km data length, and analyze along with the seismic reflection data in previous studies; (2) For the strata shallower than 50 m, we plan to use sub-bottom sonar to collect, process and analyze at least 200 km data length for side-scan sonar and sub-bottom profiler data to understand the detail shallow structures, sedimentary features and for the reference of seafloor image survey; (3) For the overall seafloor morphology, we plan to use on-board multi-beam echo sounder system to collect, process and analyze at least 300 km2 data and provide to the seafloor image survey for detail reference; (4) For the detail distribution of volcanic rocks, shipwreck and unexploded bomb, we plan to use surface-towed marine magnetometer to collect, process and analyze at least 200 km data length and provide to the seafloor image survey for detail reference; (5) For understanding the seafloor characteristics and classifying seafloor features, we plan to use the deep-towed vehicle Abyss Twisted-pair Imaging System to collect, process and analyze seafloor video footage for at least 5 km along-track length or 5 hours recording duration. |
