知本溪流域水文及環境地質調查評估

知本溪流域具有豐富的溫泉資源，流域內地質亦相當複雜，同時兼具孔隙介質與裂隙介質特性，經由流域水文及環境地質的調查，可提供流域地下水資源開發及規劃管理之參考。本研究主要目的為調查及評估知本溪水文及環境地質狀況作為地下水資源評估之基礎資料。首先流域地質調查利用航空照片判釋，瞭解流域水系、層跡、線型及崩坍地等分佈，並以1／5,000及1／10,000地形圖為底圖至現地調查加以繪製成1／25,000知本溪流域地質圖。現地不連續面分析方面，現場調查量得層面、劈理及節理之位態以DIPS軟體進行等面積投影分析。另外，在水文地質剖面方面，由蒐集之鑽探資料經研判可將地層區分成靠近地表之砂礫層與下層分佈之板岩及砂岩為主，知本溪流域現場亦進行地電阻試驗，由地電阻影像剖面圖測線底下地層不同電阻值訊號，可推估有地下水匯集或破碎帶。

關鍵字

知本溪；水文地質；地電阻法

並列摘要

Chih-Pen Creek basin has abundant hot spring resources. Although the geologic structures in the basin are complex, many of the subsurface formations are porous and fractured. We investigated the current status of hydrogeology and environmental geology of the basin to provide basic information for groundwater exploitation and management. First, we conducted surface geologic survey using aerial photos and geology maps to determine the drainage areas, layers, linear patterns, and landslide localities. The topographic maps of 1:5,000 and 1:10,000 scales were used as base maps. With information from surface geological survey these base maps were integrated into the 1:25,000 scale geologic map of Chih-Pen Creek basin. Second, the orientations of planes, cleavages, and joints were measured and a cluster analysis was made using the software DIPS. Finally, the drilling information was used to identify the gravel/sand, slate, and sandstone layers. The electrical resistivity tomography method was used to determine the sub-surface electrical resistivity variations that infer the geometry of porous and fractured aquifers.

並列關鍵字

Chih-Pen Creek basin ； hydrogeology ； electrical resistivity tomography method

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