利用碎形分析探討集集地震對地下水文系統影響之研究

Fractal Analysis of the Impact of Chi-Chi Earthquake on the Subsurface Hydrological System

董志秋(Chih-Chiu Tung) ； 徐國錦(Kuo-Chin Hsu)

《鑛冶：中國鑛冶工程學會會刊》 47卷2期 (2003/06) Pp. 152-161

https://doi.org/10.30069/MM.200306_47(2).0012

摘要

水文資料顯示921大地震影響了濁水溪沖積扇之地下水文系統，但水文系統之變化與地震因子之關聯尚待釐清。本研究根據濁水溪沖積扇地下水位觀測網之水位及水文參數資料，利用碎形維度的概念分析水位變化及地震因子間之可能關聯。分析結果顯示水位變化與地震震度及垂直位移量之碎形維度較為接近，由此推測地震震度與垂直位移量為影響水位變化之重要因素。

關鍵字

集集地震 ； 碎形維度 ； 變差圖 ； 濁水溪沖積扇

並列摘要

Data display that Chi-Chi earthquake affects the subsurface hydrological system in the Choushuishi alluvial fan, but relations between the changes of the hydrological system and earthquake need to be clearified. According to the groundwater level data of the groundwater monitoring well network in the Choushuishi alluvial fan, we make use of the concept of fractal dimension to analyze the possible correlation between the changes of water level and the factors of earthquake. The results show that the fractal dimension of water level changes is close to that of earthquake intensity and vertical displacement while the fractal dimension of the peak ground acceleration is smaller. We conclude that earthquake intensity and vertical displacement are the important factors that influence the changes of water level.

並列關鍵字

Chi-Chi earthquake ； Fractal Dimension ； Variogram ； Choushuishi Alluvial Fan