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臺灣能源期刊論文全文

臺灣能源期刊第7卷第3期內容

出刊日期:September, 2020

題目
地形與震測地層剖面分析於離岸風電場址調查之應用
Title
Marine Seismic Techniques for Offshore Changhua Wind Farm Site Investigation
作者
楊懿丞、許鶴瀚、吳俊鼐、溫修敏、陳姿婷、連政佳、洪瑋廷、劉家瑄
Authors
Eason Yi-Cheng Yang, Ho-Han Hsu, Jyun-Nai Wu, Siou-Min Wun, Tzu-Ting Chen, Cheng-Chia Lien, Wei-Ting Hung, Char-Shine Liu
摘要
本研究介紹各種地球物理調查技術與其原理,並將其應用於彰濱外海第29區離岸風電潛力場址 之地質調查,藉由分析不同聲源訊號資料,提供不同深度與解析度的地質資訊,並研究末次冰期不 整合面、最大海漫面以及現生沙波移動之基底面等三個具指標意義之地層邊界,且描繪調查區域內 之沙波厚度特徵。對於離岸風電場址之穩定性而言,開發區的地質特性,特別是淺層因沉積物移動 造成的沙波地形起伏變化為臺灣海峽風機挑戰之一,因此在風場開發區域內,海床下地層的地質特 性、沙波構造之分布以及沙波活動範圍等便為應注意的地質議題。透過不同的反射震測及多音束水 深資料,瞭解現生地形及海床下地層特徵,並分析調查區內沙波地形及沈積特性之變化,將能進一 步掌握彰濱外海離岸風電潛力場址之地質特性。
關鍵字
反射震測,底質聲納,多音束水深,沙波,離岸風電,彰濱外海
Abatract
This paper presents 4 types of marine seismic survey techniques which all have been employed for offshore wind farm (OWF) site investigation in the Taiwan Strait. These four techniques are high resolution multi-channel seismic reflection survey, sparker seismic survey, boomer and chirp sonar subbottom profiling. We discuss their benefits, limitations and applications on OWF site. Sedimentary and stratigraphic characteristics are revealed in different degrees through different geophysical methods. Three regional unconformities, including last glacier maximum unconformity, maximum flooding surface, and sand wave basal surface are identified in the survey area. Morphological changes and movements of sand waves are important issues in engineering design for turbine installation and operation. We demonstrate the distribution of sand wave basal surface and seafloor surface. These results can provide essential information evaluating geological background for turbine installation and wind farm operation in the future.
Keywords
reflector seismic image, sub-bottom profile, multibeam, offshore wind farm, sand wave, Fourier Analysis