利用暫態電磁法調查建置屏東平原南部沉積層三維電阻率模型;3D Resistivity Modeling of Sedimentary Layers in the Southern Pingtung Plain Using Transient EM Surveys

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Title:	利用暫態電磁法調查建置屏東平原南部沉積層三維電阻率模型;3D Resistivity Modeling of Sedimentary Layers in the Southern Pingtung Plain Using Transient EM Surveys
Authors:	何亞諾;Ramadhan, Agung Nugroho
Contributors:	地球科學學系
Keywords:	瞬變電磁;水文地球物理學;近地表地球物理學;Transient Electromagnetic;Hydrogeophysics;Near Surface Geophysics
Date:	2025-08-21
Issue Date:	2025-10-17 11:47:56 (UTC+8)
Publisher:	國立中央大學
Abstract:	屏東縣以農業活動、都市發展和水產養殖為主，因此用水需求相對較高，合理的水資源管理對於維持淡水供應至關重要，而水文地質建模，在應對水資源管理挑戰中發揮關鍵作用。為了評估水文地質條件，引用了非侵入式地球物理方法，如瞬變電磁 (TEM) 法，根據 TEM 方法之電阻率特性繪製地下沉積物結構相當有效。本研究在屏東南部使用 50m×50m 發射線圈收集 30 個 TEM 站點資料。對每個站點進行逆推處理以產生一維電阻率剖面。然後將一維逆推結果與現有地質數據進行比較以驗證。進一步再使用徑向基底函數插值之PyVista 來估算未知點的資料，建立了屏東南部三維模型。結果表明，遠端扇體存在低電阻率異常，近端扇體存在階地沉積物；另一個值得注意的發現是近岸存在一個低電阻率區，可能受海水-淡水交互作用的影響。;Pingtung is dominated by agricultural activity, urban development, and aquaculture, resulting in relatively high water demand. Proper water management is essential to sustain the fresh water supply, and hydrogeological modeling plays a key role in addressing water management challenges. Hydrogeological models help analyze the interaction between groundwater and natural dynamics. To estimate hydrogeological conditions, non-invasive geophysical methods such as the transient electromagnetic (TEM) method are suitable. The TEM method maps subsurface structures based on resistivity properties, making it effective for identifying hydrogeological models since sediment characteristics can be differentiated by resistivity. In this study, we collected data from 30 TEM sites in Southern Pingtung using a 50m×50m transmitter loop. Each site was processed separately to generate a 1D resistivity profile. The 1D inversion results were then compared with available geological data for validation. A 3D model was constructed using PyVista, with radial basis function interpolation applied to estimate data at unknown points. The results reveal low-resistivity anomalies on the distal fan and terrace deposits on the proximal fan. An other notable finding is a low-resistivity zone near the coast, likely influenced by seawater-freshwater interactions.
Appears in Collections:	[Graduate Institute of Geophysics] Electronic Thesis & Dissertation

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