濁水溪沖積扇頂區之地下水文特性分析案例

A Case Study of Groundwater Characteristics of the Apex of Zhuoshui River Alluvial Fan

林芳華(Fang-Hua Lin) ； 馮正一(Zheng-Yi Feng) ； 張育瑄(Yu-Hsan Chang)

《農林學報》 59卷4期 (2010/12) Pp. 369-381

https://doi.org/10.30089/JAF.201012.0006

摘要

本研究旨在探討濁水溪沖積扇頂區之地下水文特性。首先利用時間序列與頻譜分析，探討研究區內河川水位與地下水位之相關性與週期特性。並以最佳化分析逆推地下含水層之水力擴散度。本研究蒐集2005年至2008年之彰雲橋河川水位站與研究區內10口地下水位井之觀測數據進行各項分析。本研究發現研究區之河川水位對水井水位的響應，約有將近2至3個月的延宕，並有週期為一年的特性。而地下水觀測井所在位置與輸入源（如河川）之距離遠近，會影響延宕時間。本研究亦發現含水層連通性佳的地區，其能譜值較強。

關鍵字

濁水溪 ； 沖積扇 ； 頻譜分析 ； 地下水位

並列摘要

This study discussed the groundwater characteristics of the apex of the Zhuoshui river alluvial fan. We use the time series and spectra analysis to study the relationships between the river water level and groundwater level as well as the periodicity. The hydraulic diffusivity was inversely estimated by using the optimization analysis. The water level data of Chun-yun-Bridge and ten observation wells in the study area was collected from 2005 to 2008 for this study. We found that there is two to three months of response delay between the river water level and groundwater level in the studied area and there is a prominent period of one year analyzed from the data. The distance between observation well and river will influence the response delay time. This study also found that the spectra are stronger for regions with good continuous aquifer.

並列關鍵字

Zhuoshui River ； Alluvial fan ； Spectral analysis ； Groundwater level