- 期刊
屏東平原流通係數空間變異性之探討
Study on Spatial Variability of Transmissibility in Pingtung Plain
摘要
本文針對現有觀測井之水文地質參數（流通係數）爲研究對象，先將含水層作三層之概念分層，以取對數後之流通係數爲區域化變數，並以地質統計模式GSLIB計算試驗半變異元及執行理論半變異元模式之套配，以建立各層之空間變異結構，而從地文統計之觀點探討其隨距離、方向之變異特性，同時建立多個不同方向之半變異圖加以研判分析。變異模式經交叉驗證後，再以克利金(Kriging)法爲空間插值分析工具作最佳線性及不偏估性之推估(the Best Linear Unbiased Estimation)，將其異向現象表達於等值圖分佈之趨勢上。據屏東平以之分析結果顯示，對數型態之流通係數在空間中具有明顯之幾何異向性，以流通係數等值圖與現有之水文地質資料對異向性之發生原因加以探討後，初步研判應與地下水文水層形成之永文地質環境具有密切關係。此外由研究區域中克利金變異數等值圖顯示，其值較高之地離可視爲未來新設觀測井之最佳位置。
並列摘要
The spatial distribution of transmissibility of anisotropic aquifer is the study object in this paper. The transmissibility is considered as a regionalized variable. Then spatial variable structure of topography can be established by using the GSLLB model to calculate the theoretical variogram of transmissibility for generating the variogram model in spatial directions. Kriging analysis was provided also to expand the spatial variance of transmissibility and reflect the anisotropic variability in contour map. Hydro geologic data collected from Pingtung Plain were picked up as the model input. Results showed that the log term of transmissibility has strongly anisotropic variability and the anisotropic of topography in such area is controlled by its hydrogeology factor while the aquifer was forming, Kriging variance as well demonstrates that some estimated variance have higher value in portion of the study region which implies that higher priority should be assigned to such area for further hydro geologic data measurement.