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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40388

Title: Examining lake-bottom structures with the resistivity imaging method in Ilan's Da-Hu Lake in Northeastern Taiwan
Authors: Chen Huei-Fen
Chang Ping-Yu
Chang Liang-Chi
Lee Teh-Quei
Chan Yu-Chang
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Lake-bottom structures
Electrical resistivity method
Floating electrodes
Da-Hu Lake
Date: 2015-08
Issue Date: 2017-01-18T03:35:18Z
Publisher: Journal of Applied Geophysics
Abstract: Abstract: In this study, we used the electrical resistivity method for imaging subsurface structures of lake-bottom sediment in Da-Hu Lake in Ilan, Taiwan. Floating passive electrodes were used for the surveys in the study area. We deployed eighteen survey lines across the lake, and executed the survey with the Schlumberger and Wenner array. There are two geological cores, DH-7A and DH-7B, located at different locations in Da-Hu Lake. The cores were carefully collected for the purpose of the sediment and dating analyses, as well as for the geochemical testing, which can be useful to climate-change studies covering the past 10,000 years. The inverted images clarify the spatial relationships between the sediment and basement structures. The sediments above the resistive rock basement consisted of the sand sediments (from 45 to 60 Ω m) and mud sediments (less than 30 Ω m). The results of our study show that a sandy layer comprising slate debris with a resistivity of 45 to 60 Ω m is located 3 to 8 m under the water's surface in the eastern part of the lake, and the outcomes confirm the findings from the DH-7A core data. The resistivity spatial distribution suggests that the lake's sand layer originally came from a region east of the lake. We also found a sharp linear resistivity structure in the western part of the lake. The structure's strike is consistent with observations from the normal fault's surface outcrops near the western part of the lake. Consequently, we infer that this structure line might be a stretch of the normal fault and that the two cores are located at the hanging wall as well. In addition, the results show that we can use the electrical resistivity imaging method with floating passive electrodes to investigate the lake-bottom in detail.
Relation: 119
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40388
Appears in Collections:[應用地球科學研究所] 期刊論文

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