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題 名 | A Study on Tidal Efficiency in the Multiple Aquifer=多層含水層海潮效率推估之研究 |
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作 者 | 黃賢統; 黃成良; 徐輝明; | 書刊名 | 宜蘭技術學報 |
卷 期 | 7 2001.12[民90.12] |
頁 次 | 頁85-96 |
分類號 | 443.67 |
關鍵詞 | 含水層; 海潮效率; 地下水; 潮汐; Tidal efficiency; Time lag; Storage coefficient; Transmissivity; |
語 文 | 英文(English) |
中文摘要 | 本計劃一面利用既有自動水位監測系統繼續觀測地下水位,同時就其所提供之長期地下水位記錄對照有完整記錄梗枋潮位站之潮汐資料,分析研究沿海地區地下水之海潮效率及稽延時間。計劃中為探討地層參數作抽水試驗,參照前期土壤粒徑分析所得之滲透係數,研判結果一號井及二號井之貯水系數依序為0.0346及0.0345,導水係數則依序為14.84㎡/hr及17.1㎡/hr。過程中先就本地區代表性之潮汐資料及未受人為影響之地下水位歷線,求得潮汐與地下水感潮曲線方程式,分別掌握其振幅與周期,其次將潮汐方程式、抽水試驗水文地質參數及感潮地下水位方程式之相關資料整合,就二者之波動做相關係數分析,得知大潮稽延時間於二號井約為20小時,與理論值相當接近,但流壓面之感潮振幅則與理論值差異甚大,假設將所有影響因子集中為振幅h□指數項內之一參數,經就理論值及觀測值推估適合本地區之校正參數為0.406,介入此一地區性之校正因子於指數中,可得較為滿意之結果。 |
英文摘要 | The project is an extension of the previous project [A study of Tidal Efficiency in the Multiple Aquifers (1)]. The recorded data at those locations compare with the nearby tide information which has been thoroughly recorded through years at Gen-Font Tide Station to analyze the tidal efficiency and the time lag at the seashore area. To determine the theoretical values of the tidal efficiency and the time lag; both soil grain-size analyses and pumping tests are performed to find out the characteristic of aquifer including storage coefficient and transmissivity. The determined values of storage coefficient at the locations denoted as #1 and #2 are 0.0346 and 0.0345 respectively, while 14.84 ㎡/hr and 17.1 ㎡/hr for the values of transmissibility. The conclusions are twofold as follows. (I) First of all, the equations of tide- and groundwater-fluctuation curves resulting from the representative tide information and groundwater level hydrograph respectively, are used to know the amplitude and period of the fitted curve, then to calculate the corresponding value of time lag through the analysis of correlation coefficient, for example about 20 hours for the location #2. On the other hand, the theoretical value of time lag as mentioned above are compared to know the accuracy of process. Taking the location #2 as an example, the theoretical value of time lag is very close to the one determined from the above-mentioned process (20 hours). (II) Secondly, the similar process as using in the analysis of time lag is applied for the tide-induced groundwater amplitude in the analysis of the tidal efficiency. It is found that the determined values of the induced amplitude of piezometric surface are not close to the theoretical ones. However, the difference can be reduced by introducing a modification factor into the calculation. For the area under investigation in this project, the satisfactory result may be shown if the value of factor is equal to 0.406. |
本系統中英文摘要資訊取自各篇刊載內容。