| 水体蒸发中瑞利分馏公式的模拟及实验验证 |
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| 引用本文： | 胡海英,包为民,王涛,瞿思敏. 水体蒸发中瑞利分馏公式的模拟及实验验证[J]. 水利学报, 2007, 0(Z1) |
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| 作者姓名： | 胡海英 包为民 王涛 瞿思敏 |
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| 作者单位： | [1]河海大学水文水资源与水利工程科学国家重点实验室 [2]河海大学水文水资源与水利工程科学国家重点实验室 江苏南京 [3]河海大学水资源环境学院 [4]江苏南京 |
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| 基金项目： | 国家自然科学基金项目(50679024)，“十一五”国家科技支撑计划课题(2006BAC05B02)，河海大学水文水资源与水利工程科学国家重点实验室开放研究基金(2005406411) |
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| 摘 要： | 同位素水文学主要利用同位素技术解决水文学中的一些关键问题。本文简要介绍了同位素分馏的基本概念,对平衡条件下瑞利分馏机制进行了分析。以水体蒸发为例,用瑞利分馏模型模拟了水体平衡蒸发中稳定同位素的比率与温度、剩余水体积比的关系,结果显示水体平衡蒸发中稳定同位素比率是剩余水体积比的函数,随它的减小呈指数增大。通过室内外自由水体在天然条件下的蒸发实验,获得了氧同位素分馏因子与剩余水体积比的关系,其结果与瑞利分馏模型理论分析一致,实验还得出了时段分馏系数与时段蒸发量成反比的关系。
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| 关 键 词： | 瑞利分馏 稳定同位素 水体蒸发实验 分馏系数 |
Derivation of rayleigh fractionation formula and its Experiment Study in Water Evaporation |
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| HU Hai-ying. Derivation of rayleigh fractionation formula and its Experiment Study in Water Evaporation[J]. Journal of Hydraulic Engineering, 2007, 0(Z1) |
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| Authors: | HU Hai-ying |
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| Affiliation: | HU Hai-ying~ |
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| Abstract: | Isotopic technology plays an important role in isotope hydrology.The basic concept of isotope fractionation and the mechanism of Rayleigh fractionation model under equilibrium condition are discussed.Then the relationship of stable isotopic ratio in residual water,temperature and residual water proportion is modeling by Rayleigh fractionation model.Modeling result shows that stable isotope ratio in residual water increases with the decrease of the residual water proportion exponentially.An experiment of water evaporation in natural condition is designed and the results are consistent with the modeling results,the result also indicates that oxygen interval fractionation coefficient is inversely proportional to the interval evaporation capacity. |
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| Keywords: | Rayleigh fractionation Stable isotope Water evaporation experiment Fractionation coefficient |
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