2016-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/705937摘要：毛細壓力是孔隙介質多相流最重要的驅動力之一。研究顯示毛細壓力以及毛細壓力與液體飽和度 的關係會隨著液體流動的速度而改變(flow-dependent)，也就是所謂的動態毛細壓力(dynamic capillary pressure)。毛細壓力的動態現象將會影響極端降雨事件的雨水入滲、石油開採、地下水有機汙染物治 理、地質碳封存等自然現象與工程應用。近期實驗結果進一步顯示，動態毛細壓力會受到震動波的影 響，過去的靜態毛細壓力假設需要被重新審視。然而，動態毛細壓力受到震動波影響的成因，目前尚 未有明確的物理解釋。本研究計畫透過孔隙尺度的理論、實驗與模擬，分析震動波影響動態毛細壓力 的成因。本計畫擬以2年時間進行，第一年將以102~104年度科技部計畫成果為基礎，利用微模型實驗 觀測在震動波的影響下，液體介面的動態變化對於殘餘相形成與遷徙的影響，以及其與動態毛細壓力 的關聯性。同時利用動態孔隙網絡模型，模擬受震動波影響的毛細壓力與含水量之間的變化。第二年 則採用沙柱入滲實驗搭配修正型Green-Ampt model，量化震動波對於達西尺度入滲行為的影響。期望 透過一系列的實驗，凸顯震動波對於地表下液體運動的影響。研究成果將有助於了解震動波與孔隙介 質中流體的互動關係，未來將能應用於地下液體分佈監測以及地下水污染整治等工程議題。<br> Abstract: Multiphase flow in porous media is an important mechanism of subsurface hydrology, and capillary pressure is one of the major driving forces of the flow. Studies have shown that the relationship between capillary pressure and degree of saturation (Pc-S) is non-unique and flow-rate dependent. This non-uniqueness in (Pc-S) relationship is called, “dynamic capillary pressure” or “dynamic effect on the capillary pressure”. The effects of dynamic capillary pressure should be important when rain first enters a dry soil in extreme weather events, when water displaces oil during water-flooding of oil reservoirs, or when supercritical CO2 is injected into aquifers for the purposes of carbon sequestration. A recent study showed that the dynamic capillary pressure changed when seismic waves presented. However, the mechanism of the effect of the seismic wave on the dynamic capillary pressure is still unclear. The purposes of this study are to analyze the causes and effects of seismic waves on dynamic capillary pressure. A pore-scale theory, micromodel experiments and pore network simulations will be applied to show the movement of fluid-fluid interfaces subject to a seismic wave and its link to the dynamic capillary pressure. Downward infiltration experiments in sand columns will be performed to quantify how a seismic wave can affect the infiltration process. The estimated duration of this study is about two year. In the end, we expect to better understand the interaction between seismic waves and fluids and fluid-fluid interfaces in porous media.地下水文保水曲線地質碳封存subsurface hydrologysoil water retention curvegeological carbon sequestration