本計畫主題為探討用過核子燃料（核料）的最終處置場(地質處置)或進行地熱開發區內進行溫度分布的模擬與估算。受大尺度地質、斷層構造和片理、斷層破碎帶，並與中或小尺度的地熱物理參數如受岩性變化、孔隙率、岩石密度、熱傳導係數、滲透率等參數影響的基礎研究。研究基本構想為「溫度估算受到岩性物理參數、地質與邊界條件影響，數值解為必要之手段。但仍需先探討與比較不同數值方法的計算效率與所得數值解的精準度及與已知解析解兩者間差異的比較」，並進一步針對其應用發展，如以一維溫度場模擬問題，針對最終處置場井下近場溫度的監測，可按收集到的觀測資料針對溫度-深度變化與溫度梯度的量度進行擬合模擬。透過數值解與解析解兩者的比較，瞭解簡化的解析解與兼顧實際地質與邊界條件的數值解兩者間互補的關係，強調基礎研究與應用發展縱向整合的必要性。 ;The theme of this project is to explore the nuclear waste (spent nuclear fuel, SPF) final disposal or potential geothermal energy excavation site. Selecting and monitoring geological disposal site in stable geological formations for long term management of SPF is currently the strategy used in Taiwan. From scientific perspective and previous studies suggested that granite formations should be the first priority site for the waste disposal treatment in Taiwan. The proposed basic study involve numerical simulation for underground temperature estimation which affected by geological and boundary conditions. Compare with analytical solutions is needed to ensure the feasibility of developed numerical simulation scheme. Based on the available data and research results, the geological characteristics of potential disposal site and its rock types can be used as part of input model, temperature measurements can be also used for modeling. The results will be compared and evaluated through numerical simulation. Furthermore, the project will explores its potential applications for factors affecting temperature distributions beneath nuclear power plan, nuclear waste disposal or geothermal exploration sites. The scenario considering factors affecting underground temperature distribution are mainly focus on the concerns associated with existing large-scale geological with fault structures and/or even for fractured fault zone. The influence on physical parameters such as porosity, rock density, heat transfer coefficient, permeability and lithology change subject to small scale changes on cleavage, schistosity, foliation etc. will be systematically studies. Temperature or geothermal simulation will be performed based on the observable temperature-depth changes to measure or estimate temperature gradients. Through the comparison between the numerical solution and the analytical solution, the relationship between the simplified analytical solution and the numerical solution on the actual geological and various boundary conditions will be understood in a progressive and systematic manner. Emphasis on the integrate approach between basic research and development with its potential application will be enforced.
