基于碘（127，129）同位素流域水文过程机理研究与模拟

项目名称： 基于碘（127，129）同位素流域水文过程机理研究与模拟

项目编号： No.51309075

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 衣鹏

作者单位： 河海大学

项目金额： 25万元

中文摘要： 环境同位素技术是解决水文学中流域径流分割问题的重要手段。在实践中，所选同位素对流域水源识别的准确性及自身的稳定性对径流分割模型的结果影响很大。针对传统水文同位素在实际应用中表现出低敏感性、不稳定性等问题，本研究拟利用高敏感性碘同位素来替代传统同位素，并以梅林流域为研究对象，通过天然降雨-径流采样，对雨水、土壤水、地下水和河水中127I、129I、δD、δ18O 同位素及SiO2进行分析。并以碘、氢、氧同位素及SiO2构建径流分割模型，比较不同同位素输入方法差异导致模拟结果的不确定性。此外，本项目拟建立同时考虑水文过程和同位素模拟的流域水文模型，可以对流域水流和溶质复杂过程进行描述，回避传统概念性水文模型只侧重于降雨径流过程的模拟。研究成果将在水文学、环境地球化学应用等领域取得创新，为多学科交叉发展提供借鉴。

中文关键词： 碘同位素；氢氧同位素；水源划分；滞留时间；水文模型

英文摘要： Environmental isotope technology represents a vital tool to solve problem of base flow separation in a drainage area. In practice, recognition accuracy and stability of the selected isotope exerts a great influence on the results of the base flow separation model of a watershed. In view of the traditional hydrological isotopes exhibited as low sensitivity and stability in the practical application, this project is going to take an advantage of the high sensitivity of iodine isotopes to complement and expand the potential of traditional isotope applications. To verify the new methodology a suit of samples including rainfall - runoff , soil water, groundwater and river water will be used for the analysis of iodine (127I, 129I), hydrogen (δD)，oxygen (δ18O) isotopes and SiO2 in the study area of Meilin watershed. The isotope data will in turn be used to build base a flow separation model, aiming to compare uncertainty of the simulation results with respect to different isotopes input. Furthermore, the project will establish a hydrological model focusing on hydrological processes and isotope distribution at the same time. Such an approach provides profound understanding of the complex water flow and solute process in a watershed, and open a new frontier for comparison with the traditional conceptual hydrologic

英文关键词： Iodine isotope；Stable isotopes of Hydrogen-2 and Oxygen-18；Water sources tracing；Residence time；Hydrologic model