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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/42028

Title: Use of stable water isotopes to assess sources and influences of slope groundwater on slope failure
Authors: Tsung-Ren Peng;Chung-Ho Wang;Shih-Meng Hsu;Nai-Chin Chen;Tai-Wei Su;Jiin-Fa Lee
Contributors: 國立臺灣海洋大學:河海工程學系
Date: 2012-01-30
Issue Date: 2017-04-21T07:53:52Z
Publisher: Hydrological Processes
Abstract: Abstract:This study employs stable oxygen and hydrogen isotopes as natural tracers to assess the headwater of a landslide next to a drainage divide and the importance of the slope's headwater in the study area. The study is undertaken near Wu-She Township in the mountains of central Taiwan. Because a reservoir is located on the other side of the divide, this study evaluates the relationship between the reservoir water and headwater of the landslide as well. Over a 1-year period, water samples from September 2008 to September 2009, including local precipitation (LP), Wu-She Reservoir's water (WSRW), slope groundwater (SGW), upper-reach stream water (USTW), and down-reach stream water (DSTW), were analysed for deuterium (δD) and oxygen (δ18O) stable isotopes. Results indicate that WSRW is the predominant component in SGW: approximately 70% of SGW originates from WSRW and 30% from LP based on a two end-member mass-balance mixing model for δ18O. The similar two end-member mixing model is also employed to assess the contributions of USTW and SGW to DSTW. Model results indicate that SGW is the major source of DSTW with a contribution of about 67%. Accordingly, about 47% of DSTW sources from the WSRW. In short, owing to reservoir leakage, WSRW contributes the greater part of both SGW and DSTW. Plentiful WSRW in SGW threatens the stability of the slope in the divide area. To avoid subsequent continuous slope failure, necessary mitigation steps are required.
Relation: 26(3), pp.345-355
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/42028
Appears in Collections:[河海工程學系] 期刊論文

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