豐枯水期、位移事件與電阻率變化率間的關係：以宜蘭太平山蘭台地區為例;Relationships between Wet/Dry Season, Displacement Events, and Variations in Electrical Resistivity: Case Study in the Lantai area, Taiping Mountain, Yilan, Northeast Taiwan

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Title:	豐枯水期、位移事件與電阻率變化率間的關係：以宜蘭太平山蘭台地區為例;Relationships between Wet/Dry Season, Displacement Events, and Variations in Electrical Resistivity: Case Study in the Lantai area, Taiping Mountain, Yilan, Northeast Taiwan
Authors:	方友群;Fang, Yu-Chun
Contributors:	地球科學學系
Keywords:	地電阻影像剖面法;大規模崩塌;山崩監測
Date:	2024-07-23
Issue Date:	2024-10-09 15:38:28 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究使用一種多波道的直流電阻法與自然電位法監測系統(R2MS)對位於台灣宜蘭縣大同鄉太平山蘭台地區的一處大規模崩塌區域以不同於傳統電極陣列的混編陣列進行連續的地電阻影像剖面法監測，收集自2022年十月底到2023年十月底之電阻率剖面資料，並結合現地之鑽井岩芯、雨量、地下水位，以及地表與孔內伸縮計的觀測數據進行分析。結果發現電阻率剖面符合現地鑽井資料，顯示地電阻影像剖面法於大規模崩塌區可以有良好的解析能力。　　觀察相同時間段的月雨量變化，發現於2022年十二月至2023年六月的降水符合由豐水轉枯水；枯水轉豐水的變化行為，因此使用該時間段的月平均電阻率剖面進行每月電阻率差異率剖面分析。其結果顯示出表土崩積層與疑似剪切帶之區域具有豐枯水期的變化特徵，其變化率約在百分之十五至百分之二十五間，符合相關的物理現象。　　本研究在2023年八月中至九月初於地表與孔內伸縮計資料中發現位移現象，並利用日平均電阻率變化率平均剖面等方式進行分析，其結果發現於疑似剪切帶區域於短時間內出現約百分之二十五的變化率，顯示出地電阻影像剖面法對於崩塌地的位移事件亦能有良好的反應。此外，本研究亦將該結果與該研究區域於2020夏季發生的小規模滑移事件進行比較，認為兩事件之間電阻率變化率差異可能由2020的事件影響時間較長，與較大的地下位移造成。最後，本研究根據上述成果，建議若短時間同一天同一區域對其他天的電阻率變化率皆超過百分之二十五，便可研議發布崩塌警戒，期以為大規模崩塌預警系統提供貢獻。 ;This study uses a Remote Resistivity Monitoring System (R2MS) to monitor a large-scale landslide area in the Lantai area of Taiping Mountain, Datong Township, Yilan County, Taiwan, using a mixed array different from the traditional array. By continuous electrical resistivity tomography (ERT) monitoring, this study collects resistivity profile data from the end of October 2022 to the end of October 2023 and combines it with on-site core samples, precipitation, groundwater levels, and observations from the surface and in-hole linear wire potentiometers data are analyzed. The results showed that the resistivity profile is consistent with the existing core samples. By observing the changes in monthly rainfall during the same period, it was found that the precipitation from December 2022 to June 2023 fit with the changed behavior of the wet/dry season. Thus, the change rate profiles of the monthly average resistivity of this period were used. The results show that the resistivity of the colluvium layer and the area of the suspected shear zone have the changing characteristics of wet and dry periods, consistent with relevant physical imagination. This study found the displacement in the surface and in-hole linear wire potentiometer data from mid-August to the beginning of September 2023. It analyzed this event using the daily average resistivity change rate average profile. The results show that the ERT method responds well to displacement events. In addition, this study also compares the result with the small-scale slip event that occurred in the study area in the summer of 2020 and gives possible reasons for the difference in resistivity change rates between the two events. It shows that continuous ERT monitoring has the potential to contribute to the tectonic changes and mechanisms of landslide occurrence.
Appears in Collections:	[Graduate Institute of Geophysics] Electronic Thesis & Dissertation

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