臺灣因地理位置關係，常受颱風侵襲，而產生氣候變化。每年4月至8月常有颱風影響臺灣的天氣。受颱風侵襲時，氣壓會有下降的情況，而1999年集集地震後，經濟部水資源局在鄰近於車籠埔斷局西側的濁水溪沖積扇建立之地下水監測井，恰好提供颱風期間濁水溪沖積扇之水位變化。
　　為了解氣壓與地下水位變化關係，本研究搜集近五年來的氣壓與地下水位變化資料，以Jacob(1940)的基本理論與張宏榮(2000)的氣壓與水位的頻譜分析方法為基礎，進行地下水位參數推估。並畫出氣壓變化、水位變化與雨量變化之歷線圖，並將氣壓變化與水位變化進行交互頻譜分析，最後利用迴歸方法，以求取氣壓效率、儲水係數及彈性模數。
　　本研究先以2004年康伯斯颱風時間為研究區段，取濁水溪流域的三個東西向剖面進行交互頻譜分析與迴歸，透過氣壓與水位變化的頻譜關係分析結果，求得各含水層之地下水水力參數。再以艾利颱風做為對照組，以艾利颱風求得的氣壓效率值與康柏斯颱風所求得之氣壓效率值做比較，以了解本研究之理論於不同時間用以推估地下水力參數之適用性。

Generally, the geohydrologic parameters are obtained through the pumping test. Although the pumping test can provide more accurate information. It is expensive and only provides limited data due to its limited testing scale.
The spectral analysis of groundwater level of a well has some success in estimating the hydraulic diffusion coefficient of well-aquifer system. This study proposes to use the spectral analysis of the barometric responses of wells. The region under investingation is ChouShui River Alluvial Fan.
Based upon the proposed method, one can estimate the geohydrologic parameters include the barometric efficiency, storage coefficient, modulus of elasticity through the physical effect of barometric pressure to groundwater level. The limitation of the proposed method is also discussed.

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