應用變水頭實驗及推估公式對河床水力傳導係數之分析

Analysis of Hydraulic Conductivity on Riverbeds by Using Falling-Head Tests and Estimating Models

丁澈士(CHEH-SHYH TING) ； 柯亭帆(TIENFUAN KERH) ； 吳峰誼(PHONE-YEA WU)

《台灣水利》 44卷1期 (1996/03) Pp. 26-35

摘要

地下水補注推估爲水資源評估與管理中一個熱門的研究課題，而水力傳導係數正是其中的一項重要因子。因此本文卽針對位於屏東平原之高屏溪及東港溪二條主要河川，取其沉積河床土壤之樣本，利用變水頭實驗以求得其水力傳導係數。接著再利用已有之鑽探資料及所取土樣篩分析之結果，分別用Hazen、Shepherd及Marshell推估公式加以探討。從結果顯示以實驗所獲得之數據比使用經驗公式所得的結果較具代表性，特別是將其當做數值模擬時之輸入值而言，實驗值是為較佳之選擇。上述資料除對屏東平原的水文地質特性可適當地反應出來外，並對提高平原研究地下水補注之精度有所助益。

關鍵字

屏東平原 ； 水力傳導係數 ； 變水頭試驗 ； 地下水補注

並列摘要

Groundwater recharge is an important issue in the field of water resource engineering. The hydraulic conductivity is one of major factor for estimating the amount of groundwater recharge. Therefore, in the present study, sedimentary samples of two main riverbeds, i. e. Kaoping river and Tungkang river, located in Pingtung plain, are taken to obtain hydraulic conductivity by using a falling-head permeameter. Additionally, the core-test data and sorting analysis of soil samples are used to investigate the hydraulic conductivity based on Hazen, Shepherd and Marshell models. The results exhibited that the experimental data are more useful, and can be taken as input values for a numerical simulation. These information may reflect the hydrogeological characteristics of Pingtung plain, and may help to improve the accuracy of study on groundwater recharge in such area.

並列關鍵字

Pingtung plain ； Hydraulic conductivity ； Falling-head permeameter ； Groundwater recharge