頁籤選單縮合
題 名 | 礫石層粒徑與透水係數之關係=Correlations of Hydraulic Conductivity and Grain Size of Gravel Formation in Pingtung Plain, Southern Taiwan |
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作 者 | 陳文福; 張益生; 田巧玲; | 書刊名 | 臺灣水利 |
卷 期 | 47:4=188 1999.12[民88.12] |
頁 次 | 頁58-65 |
分類號 | 443.67 |
關鍵詞 | 礫石粒徑; 透水係數; 屏東平原; Gravel size; Hydraulic conductivity; Pingtung plain; |
語 文 | 中文(Chinese) |
中文摘要 | 前人研究(Vukovic and Soro, 1992)指出含水層之透水係數(K)與有效粒徑平方呈 正比,今因地下水觀測網在屏東平原建置觀測井,若能建立此一關係,則能由砂樣粒徑反推 地層之透水係數,對於該區域之地下水模擬與管理將有很大的助益。因屏東地區主要的地下 水產水層皆出於礫石層,探樣與分析皆較不易,所以本區域尚未有礫石層粒徑分析的研究。 本研究以現地鑽探採取礫石砂樣,每樣本約 10-30 公斤重, 研究區共有 14 口觀測井,總 共取有 120 袋標本,其中有 27 袋位於觀測井之濾管範圍內, 可以代表含水層粒徑特性, 透水係數 K 值則由單井抽水試驗求 T 值,後再以 T 值除以濾水管長度得之。 27 組數據 中有 22 組的礫石粒徑與透水係數有明顯的關係,如以下公式:K=0.38 × D �稓� (此式中 透水係數 K 的單位為 m/min, D �猼熙璁鴐� mm)。 此結果與 Hazen(1911) 的公式比較 (K=C × D �稓插C此式中透水係數 K 的單位為 cm/s,D �猼熙璁鴐� cm),相當於 C= 80, 為淘選良好的中細砂, 可能表示屏東平原的礫石層因淘選不佳 (均勻係數約 3-180),孔隙 率低 (70% 樣本約在 0.26-0.30),其透水性能只相當於淘選良好的中細砂層。 |
英文摘要 | Previous theoretical and empirical investigations of the relation between particle size and hydraulic conductivity (K) have resulted in the well-known formula: K=C × D �� were D is effective particle diameter, and C is a dimensionless constant. However, in Pingtung plain of southern Taiwan, the important aquifers are composed by gravel formation, but the searching of correlation of hydraulic conductivity and grain size were focused on the sand aquifer. Therefore, the purpose of this paper is to propose an empirical equation for the hydraulic conductivity and gravel size. From the upper 200 m aquifers, 27 grain size samples each weighted from 10 to 30 kg were taken for size analysis. Hydraulic conductivity were obtained from pumping test on those aquifers. Our data show the hydraulic conductivity/grain size relation may be expressed, as K=0.38 × D �稓� were unit of K is in m/min, and D �� is in mm. |
本系統中英文摘要資訊取自各篇刊載內容。