此論文旨在研究膠體與核種於沉積土壤中的遷移行為，由文獻 Environmental Science ＆ Technology- Markus Flury顯示，沉積土壤的傳輸模式並不適合於裂縫傳輸模型，並非傳統的膠體傳輸觀念，而是適合非平衡模式(non-equilibrium model)，即把液相系統中分為可移動水層與不可移動水層，即所謂的雙區間傳輸模型(two-region transport model)，來探討膠體對核種傳輸的影響。
本論文基於此一觀點，深入探討膠體尺寸與膠體傳輸機制的相關物理及數學模型，並利用此數學模型來探討膠體大小與放射性核種傳輸之關係。研究假設不同傳輸模型，當膠體較大時，無法進入岩層中，可傳輸較遠距離; 反之，當膠體尺寸越小時，則是受延散(dispersion)進入多孔性岩體(porous media)的影響，使得它的傳輸距離不遠。 因此，研究膠體在不同情況下，對於放射性核種傳輸具有很大的影響。核種與膠體在地下水的傳輸假設為以下三種機制；(1)假設膠體與核種均不可進入岩層裡；(2)假設核種可進入岩層裡，但膠體無法進入岩層裡；(3)假設核種與膠體均可以進入岩層裡。利用拉普拉司轉換法可以對單獨只有膠體存在之傳輸模型求得解析解。而核種與膠體傳輸方程式需耦合，利用數值方法可解出總可移動核種之濃度，並對膠體與核種之相關參數進行靈敏度分析及討論。

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