崩塌地滑動徵兆與地下水化學因子之關聯性分析

Correlation Analysis of Landslide Precursor Factors and Concentrations of Cations and Anions

張國欽(Kuo-Chin Chang) ； 溫惠鈺(Hui-Yu Wen) ； 陳耐錦(Nai-Chin Chen) ； 李鳳梅(Feng-Mei Li) ； 林榮潤(Jung-Jun Lin) ； 柯建仲(Chien-Chung Ke) ； 鄭裕適(Yu-Shih Cheng)

《中華水土保持學報》 52卷1期 (2021/03) Pp. 1-15

https://doi.org/10.29417/JCSWC.202103_52(1).0001

摘要

本文以嘉義縣中埔鄉東興村的八寶寮崩塌地（DS181）為研究場址，綜整歷年崩塌地現地調查與觀測資料、地下水與地表水水體之導電度，以及水離子濃度變化反應，提出崩塌地滑動時之地下水化學因子變動關聯性。透過不同降雨事件之水離子濃度分析、孔內變形量觀測資料及水體導電度變化之關聯性研究結果顯示，八寶寮崩塌地地下水體之水體導電度變化會受到崩塌地滑動影響而升高。因此，本文推測水體導電度應為八寶寮崩塌地滑動徵兆之重要關鍵因子之一，且其與碳酸氫根、硫酸根、鈣離子、鎂離子及鈉離子之濃度具有中度至高度相關性。

關鍵字

崩塌地 ； 滑動徵兆 ； 水體導電度 ； 水離子濃度

並列摘要

In this study, an innovative physical-chemical approach was integrated with site investigation techniques and real-time monitoring data for the past 3 years to understand the mechanisms of large-scale landslides. To investigate and understand mechanism of slope movements, various real-time monitoring data-including rainfall, electrical conductivity, borehole biaxial displacements, groundwater levels, and multitemporal satellite and UAV images-were collected from the site of the Babaoliao landslide. This research site is located at Dongxing Village, Zhongpu Township, Chiayi County, Taiwan. According to a geological investigation, downhole geophysical logging, and in situ monitoring data analysis, the key precursors to the landslide were identified by the occurrence of slope movement events and changes in groundwater chemistry. After assessing the aforementioned approach and actual sliding events, we could find that electrical conductivity to be the most sensitive factor as the landslide precursors. Furthermore, the groundwater composition of this research site were high correlation with electrical conductivity such as the concentration of bicarbonate ions, sulfate ions, calcium ions, magnesium ions, and sodium ions.

並列關鍵字

landslide precursor ； electrical conductivity ； cation and anion concentration