坡地含水層之水力及力學參數空間分布對於山崩相關研究及公共工程建設非常重要，由於坡地崩塌問題常涵蓋較大區域，以傳統的水力或力學試驗取得足夠的水力及力學參數常受限於經濟、人力與技術上的困難。山區的坡地含水層對區域降雨常伴隨極大的地下水位變動，且因地形關係，地下水壓變化可傳遞較長距離甚至到達坡趾。此區域降雨造成水壓傳遞較傳統水力試驗大，可視為一大尺度天然刺激源，若能有效利用此天然刺激源結合小尺度的水力或力學試驗，將可提供大尺度且高解析度之水力及力學參數分布。本研究規劃為期三年的研究，主要目的為(1)開發、測試及驗證一個坡地含水層水力及力學參數推估模式；(2)利用實驗室尺度試驗，驗證數值模式，並於研究場址進行試驗及觀測作為模式應用。推估模式將以水力剖面探測(hydraulic tomography surveys)概念為基礎，整合天然與人工刺激源跨尺度的水壓反應資訊，推估坡地含水層區域尺度水力及力學參數空間分布。模式除了以假想例進行系列的測試外，將以實驗室垂直二維砂箱試驗驗證模式。本研究最後將以阿里山台18 線五彎仔路段做為研究區域，進行現地試驗與觀測，結合其他子計畫研究成果(子計畫一、三及四)，推估區域尺度坡地含水層水力及力學參數空間分布，推估結果可進一步提供區域尺度的邊坡破壞及坡地崩塌潛勢評估(子計畫五及六)，作為預警技術研發的重要參考(子計畫一及四)。The spatial distribution of hydraulic and the associated mechanical properties in colluvial aquifers can provide key information for landslide assessments and public constructions. Due to the high cost and technical difficulties to measure aquifer properties for colluvial aquifers, the traditional hydraulic and soil tests may not be applicable for regional scale slope failure problems. However, in most mountainous areas the natural hydraulic stresses such as the strong rainfall and the high variation of groundwater tables in colluvial aquifers are typically available. With suitable integrations of hydraulic responses from different stresses and scales, the high-resolution hydraulic and mechanical properties in a colluvial aquifer system can be obtained. Motivated by the need to characterize regional scale colluvial aquifer systems, the objectives of the three-year project are (1) to develop, test, and verify a numerical inverse model to estimate hydrogeological and mechanical properties for colluvial aquifer systems, and (2) to conduct laboratory and field scale experiments for verification and application of the developed inverse model. Based on the concept of hydraulic tomography surveys, the cross-scale hydraulic fluctuations caused by either natural or artificial stresses will be automatically integrated with a co-kriging optimization technique. This study starts with the model tests for synthetic colluvial aquifers. Then the 2-D laboratory sandbox experiments will be conducted to verify the developed model for laboratory scale problems. With the cooperation of all involved sub-projects, the developed mode is expected to provide high resolution of hydrological and mechanical properties for assessing field scale slope failure problems on 28K to 31K of Taiwan 18 line in Alishan area. Future applications of the developed model and the associated measurement techniques can be the characterizations of regional scale slope failure problems and developments of landslide or debris flow warning systems. 研究期間：10008 ~ 10107
