地下水位與地盤沈陷轉換關係之時序分析

Estimation of the Transfer Relationship Between Groundwater Level and Ground Subsidence by Time Series Analysis

10.29417/JCSWC.199912_30(4).0002

蘇苗彬(Miau-Bin Su)；陳旺志(Wang-Jyh Chen)；陳奕弦(Yi-Shern Chen)

轉換函數模式 ； 地下水位 ； 地盤沈陷 ； transfer function model ； groundwater level ； around subsidence

中華水土保持學報

30卷4期（1999 / 12 / 01）

253 - 261

繁體中文

本文針對本省中西部沿海地區沈陷較嚴重之台西及王功地區，以時間序列分析建立其地下水位變動量與沈陷量之轉換函數模式，並考慮於單位（1m）之地下水位降低量條件下，以轉換函數模式推估其沈陷反應及反推其當量壓密層之壓密係數（Cv）。分析結果顯示，位於濁水溪南邊壓密層較厚之台西站，其總沈陷量較北邊之王功站大，壓密所需時間台西站亦大於王功站，而求得之壓密係數則位於實驗室實驗資料分佈範圍之低限地帶，此外二元交叉相關函數分析結果，則顯示以1個月爲分析之時間單位下，地下水位之變動誘發顯著之立即沈陷。

This study is focused on the serious subsided areas -Taisi and Wankon, which are located at the seaside of the western Taiwan. The transfer function models between groundwater level fluctuation and ground subsidence are formulated by time series analysis. These transfer function models are used to estimate the subsidence response and to back analyze the consolidation coefficient (Cv) of the equivalent consolidated layer, under the situation of unit (1 m) reduction of groundwater table. The analysis results show that the total subsidence of Taisi, which has thicker fine-grained consolidated layer, is larger than Wankon, and the consolidation time of Taisi is longer than Wankon. The consolidation coefficients from back calculations are nearby the low limit of the laboratory tested data distribution extent. Finally, the groundwater level fluctuations induce significant immediate settlement according to the two variate cross correlation function analysis under monthly time scale.