蒸发过程中饱和土壤水稳定同位素运移规律浅析

Study of Stable Isotope Model for Saturated Soil Water Movement in the Condition of Evaporation

基于Fick定律和质量守恒定律推导了饱和土壤水在蒸发过程中的稳定同位素微分方程模型,分析了饱和土壤水的边界条件,给出了解析解,为数值模拟蒸发、蒸发过程中土壤水的稳定同位素组成变化提供了确定性的数学基础,对土壤水分运动以及土壤水稳定同位素的研究具有一定的理论意义。

The differential equation model of stable isotope composition in saturated soil water at evaporation condition based on the Fick law and the conservation of mass law was proposed. The boundary condition and initial condition were analyzed, and the analytic solution of the differential equation model was obtained. The model provides deterministic mathematic foundation for numerical simulation of saturated soil water stable isotope movement in the condition of evaporation, and are of important theoretical significance for soil water movement.